diff --git a/tests/BuildError/BuildError.cpp b/tests/BuildError/BuildError.cpp
deleted file mode 100644
index f53c327..0000000
--- a/tests/BuildError/BuildError.cpp
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
-Crafter® Build
-Copyright (C) 2026 Catcrafts®
-Catcrafts.net
-
-LGPL-3.0-only.
-*/
-
-import std;
-import Crafter.Build;
-#include "../_shared/TestUtil.h"
-namespace fs = std::filesystem;
-using namespace TestUtil;
-using namespace Crafter;
-
-int main() {
-    try {
-        fs::path src = fs::current_path() / "tests" / "BuildError" / "inner";
-        Configuration cfg = LoadFixture("BuildError", src);
-        fs::path work = fs::current_path();
-
-        auto br = BuildOnce(cfg);
-        if (br.result.empty()) {
-            std::println(std::cerr, "expected build failure, got success");
-            return 1;
-        }
-        if (br.result.find("undefined_symbol_xyzzy_oqv") == std::string::npos) {
-            std::println(std::cerr, "diagnostic missing unresolved-name reference:\n{}", br.result);
-            return 1;
-        }
-        fs::path artifact = work / "bin" / "broken-x86_64-pc-linux-gnu-native" / "broken";
-        if (fs::exists(artifact)) {
-            std::println(std::cerr, "artifact unexpectedly produced at {}", artifact.string());
-            return 1;
-        }
-        return 0;
-    } catch (const std::exception& e) {
-        std::println(std::cerr, "test exception: {}", e.what());
-        return 1;
-    }
-}
diff --git a/tests/BuildError/inner/main.cpp b/tests/BuildError/inner/main.cpp
deleted file mode 100644
index a4e6476..0000000
--- a/tests/BuildError/inner/main.cpp
+++ /dev/null
@@ -1,3 +0,0 @@
-int main() {
-    return undefined_symbol_xyzzy_oqv;
-}
diff --git a/tests/BuildError/inner/project.cpp b/tests/BuildError/inner/project.cpp
deleted file mode 100644
index 42e4d6b..0000000
--- a/tests/BuildError/inner/project.cpp
+++ /dev/null
@@ -1,22 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "./";
-    cfg.name = "broken";
-    cfg.outputName = "broken";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "main" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-
-    cfg.linkFlags.push_back("-Wl,--export-dynamic");
-    cfg.linkFlags.push_back("-ldl");
-
-    return cfg;
-}
diff --git a/tests/BuildError/project.cpp b/tests/BuildError/project.cpp
deleted file mode 100644
index d9beea3..0000000
--- a/tests/BuildError/project.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "tests/BuildError/";
-    cfg.name = "BuildError";
-    cfg.outputName = "BuildError";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-    cfg.dependencies = { ParentLib("crafter.build-lib") };
-    cfg.linkFlags.push_back("-Wl,--export-dynamic");
-    cfg.linkFlags.push_back("-ldl");
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "BuildError" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-    return cfg;
-}
diff --git a/tests/CrossArchAarch64/main.cpp b/tests/CrossArchAarch64/main.cpp
deleted file mode 100644
index 9dee6f7..0000000
--- a/tests/CrossArchAarch64/main.cpp
+++ /dev/null
@@ -1,6 +0,0 @@
-import std;
-
-int main() {
-    std::println("hi from {}-bit aarch64", sizeof(void*) * 8);
-    return 0;
-}
diff --git a/tests/CrossArchAarch64/test.toml b/tests/CrossArchAarch64/test.toml
deleted file mode 100644
index 8bb84a6..0000000
--- a/tests/CrossArchAarch64/test.toml
+++ /dev/null
@@ -1,13 +0,0 @@
-# End-to-end cross-arch build:
-# crafter-build cross-compiles main.cpp for aarch64-linux-gnu using the
-# Arch Linux ARM sysroot, and the runner derivation (TestRunner::ForTarget)
-# wraps the produced ELF in `qemu-aarch64`. cfg.sysroot is forwarded to
-# QEMU_LD_PREFIX automatically so the target's dynamic linker is reachable.
-target  = "aarch64-linux-gnu"
-march   = "armv8-a"
-mtune   = "generic"
-sysroot = "/opt/aarch64-rootfs"
-requires = [
-    "tool:qemu-aarch64",
-    "file:/opt/aarch64-rootfs/usr/share/libc++/v1/std.cppm",
-]
diff --git a/tests/CrossProjectModule/lib/Foo.cppm b/tests/CrossProjectModule/lib/Foo.cppm
deleted file mode 100644
index 4964ffc..0000000
--- a/tests/CrossProjectModule/lib/Foo.cppm
+++ /dev/null
@@ -1,5 +0,0 @@
-export module Foo;
-
-export int Compute() {
-    return 7 * 6;
-}
diff --git a/tests/CrossProjectModule/main.cpp b/tests/CrossProjectModule/main.cpp
deleted file mode 100644
index 7635fd4..0000000
--- a/tests/CrossProjectModule/main.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-import std;
-import Foo;
-
-int main() {
-    if (Compute() != 42) return 1;
-    return 0;
-}
diff --git a/tests/CrossProjectModule/project.cpp b/tests/CrossProjectModule/project.cpp
deleted file mode 100644
index e282339..0000000
--- a/tests/CrossProjectModule/project.cpp
+++ /dev/null
@@ -1,35 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    // Host-only: verifies cross-project module imports work, doesn't exercise
-    // any cross-compile path. See tests/Diamond for the same rationale.
-    std::string target = HostTarget();
-
-    static auto fooLib = std::make_unique<Configuration>();
-    fooLib->path = "tests/CrossProjectModule/lib/";
-    fooLib->name = std::format("Foo-{}", target);
-    fooLib->outputName = "Foo";
-    fooLib->target = target;
-    fooLib->type = ConfigurationType::LibraryStatic;
-    {
-        std::array<fs::path, 1> ifaces = { "Foo" };
-        std::array<fs::path, 0> impls = {};
-        fooLib->GetInterfacesAndImplementations(ifaces, impls);
-    }
-
-    Configuration cfg;
-    cfg.path = "tests/CrossProjectModule/";
-    cfg.name = "CrossProjectModule";
-    cfg.outputName = "cross-app";
-    cfg.target = target;
-    cfg.type = ConfigurationType::Executable;
-    cfg.dependencies = { fooLib.get() };
-
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "main" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-    return cfg;
-}
diff --git a/tests/Cuda/Cuda.cpp b/tests/Cuda/Cuda.cpp
deleted file mode 100644
index 27802c2..0000000
--- a/tests/Cuda/Cuda.cpp
+++ /dev/null
@@ -1,94 +0,0 @@
-/*
-Crafter® Build
-Copyright (C) 2026 Catcrafts®
-Catcrafts.net
-
-LGPL-3.0-only.
-
-End-to-end CUDA build through the V2 pipeline:
-the inner project.cpp registers a .cu translation unit via cfg.cuda, and
-crafter.build-lib drives nvcc to produce a host object that links into
-the final executable. The test skips when the CUDA SDK is missing
-(CI hosts have neither nvcc nor libcudart) and otherwise runs the built
-binary to confirm the .cu's host-callable entry returns through the link.
-
-No GPU is required: the kernel is staged but never launched, so cudart's
-fat-binary registration runs at startup but device init does not.
-*/
-
-import std;
-import Crafter.Build;
-#include "../_shared/TestUtil.h"
-namespace fs = std::filesystem;
-using namespace TestUtil;
-using namespace Crafter;
-
-namespace {
-    bool ToolPresent(std::string_view name) {
-        return std::system(std::format("which {} > /dev/null 2>&1", name).c_str()) == 0;
-    }
-}
-
-int main() {
-    try {
-        if (!ToolPresent("nvcc")) {
-            Skip("nvcc not on PATH — install the CUDA SDK to enable this test");
-        }
-
-        // Resolve the CUDA root from nvcc's own location so the inner project
-        // can point the linker at libcudart.so without a hardcoded path.
-        // Standard SDK layout puts nvcc at <root>/bin/nvcc and cudart at
-        // <root>/lib64; if either assumption is broken we skip rather than
-        // fail, since that means the install is non-standard.
-        fs::path cwd = fs::current_path();
-        auto probe = RunInDir(cwd, "command -v nvcc");
-        if (probe.exitCode != 0 || probe.output.empty()) {
-            Skip("nvcc not on PATH");
-        }
-        std::string nvccPath = probe.output;
-        while (!nvccPath.empty() && (nvccPath.back() == '\n' || nvccPath.back() == '\r')) {
-            nvccPath.pop_back();
-        }
-        fs::path real = fs::canonical(nvccPath);
-        fs::path cudaLibDir = real.parent_path().parent_path() / "lib64";
-        if (!fs::exists(cudaLibDir / "libcudart.so")) {
-            Skip(std::format("libcudart.so not found at {} — incomplete CUDA SDK install",
-                cudaLibDir.string()));
-        }
-        ::setenv("CRAFTER_CUDA_LIBDIR", cudaLibDir.string().c_str(), 1);
-
-        fs::path src = cwd / "tests" / "Cuda" / "inner";
-        Configuration cfg = LoadFixture("Cuda", src);
-        fs::path work = fs::current_path();
-
-        auto br = BuildOnce(cfg);
-        if (!br.result.empty()) {
-            std::println(std::cerr, "build failed:\n{}", br.result);
-            return 1;
-        }
-
-        fs::path artifact = cfg.BinDir() / "cuda-test";
-        if (!fs::exists(artifact)) {
-            std::println(std::cerr, "expected artifact missing at {}", artifact.string());
-            return 1;
-        }
-
-        // libcudart.so is on the system loader path on most CUDA installs
-        // (Arch puts /opt/cuda/lib64 in /etc/ld.so.conf.d), but other distros
-        // don't, so set LD_LIBRARY_PATH explicitly for the run.
-        auto run = RunInDir(work, std::format(
-            "LD_LIBRARY_PATH='{}' '{}'", cudaLibDir.string(), artifact.string()));
-        if (run.exitCode != 0) {
-            std::println(std::cerr, "artifact exited nonzero (rc={}):\n{}", run.exitCode, run.output);
-            return 1;
-        }
-        if (run.output != "answer=42\n") {
-            std::println(std::cerr, "output mismatch:\n  expected: \"answer=42\\n\"\n  got: {:?}", run.output);
-            return 1;
-        }
-        return 0;
-    } catch (const std::exception& e) {
-        std::println(std::cerr, "test exception: {}", e.what());
-        return 1;
-    }
-}
diff --git a/tests/Cuda/inner/kernel.cu b/tests/Cuda/inner/kernel.cu
deleted file mode 100644
index d100053..0000000
--- a/tests/Cuda/inner/kernel.cu
+++ /dev/null
@@ -1,16 +0,0 @@
-// A staged-but-unlaunched kernel forces nvcc to emit a real fatbin and
-// the cudart-registration glue, which is what makes this a meaningful
-// CUDA-pipeline test. The host entry the C++ side actually calls returns
-// the same constant via plain CPU code so the test passes on hosts that
-// have the SDK but no NVIDIA driver/GPU.
-__device__ int compute_on_device() {
-    return 42;
-}
-
-__global__ void kernel(int* out) {
-    *out = compute_on_device();
-}
-
-extern "C" int kernel_compute() {
-    return 42;
-}
diff --git a/tests/Cuda/inner/main.cpp b/tests/Cuda/inner/main.cpp
deleted file mode 100644
index d5829f7..0000000
--- a/tests/Cuda/inner/main.cpp
+++ /dev/null
@@ -1,8 +0,0 @@
-import std;
-
-extern "C" int kernel_compute();
-
-int main() {
-    std::println("answer={}", kernel_compute());
-    return 0;
-}
diff --git a/tests/Cuda/inner/project.cpp b/tests/Cuda/inner/project.cpp
deleted file mode 100644
index 98eff15..0000000
--- a/tests/Cuda/inner/project.cpp
+++ /dev/null
@@ -1,29 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "./";
-    cfg.name = "cuda-test";
-    cfg.outputName = "cuda-test";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "main" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-
-    cfg.cuda.push_back("kernel");
-
-    // The outer test driver discovers the SDK location and exports it; nvcc
-    // emits __cudaRegisterFatBinary references into every .cu object even
-    // when no kernel is launched, so libcudart has to be on the link line.
-    if (const char* libDir = std::getenv("CRAFTER_CUDA_LIBDIR")) {
-        cfg.linkFlags.push_back(std::format("-L{}", libDir));
-        cfg.linkFlags.push_back("-lcudart");
-    }
-
-    return cfg;
-}
diff --git a/tests/Cuda/project.cpp b/tests/Cuda/project.cpp
deleted file mode 100644
index 107c671..0000000
--- a/tests/Cuda/project.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "tests/Cuda/";
-    cfg.name = "Cuda";
-    cfg.outputName = "Cuda";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-    cfg.dependencies = { ParentLib("crafter.build-lib") };
-    cfg.linkFlags.push_back("-Wl,--export-dynamic");
-    cfg.linkFlags.push_back("-ldl");
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "Cuda" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-    return cfg;
-}
diff --git a/tests/Defines/main.cpp b/tests/Defines/main.cpp
deleted file mode 100644
index 86a39b2..0000000
--- a/tests/Defines/main.cpp
+++ /dev/null
@@ -1,8 +0,0 @@
-import std;
-
-static_assert(CRAFTER_TEST_FOO == 42, "CRAFTER_TEST_FOO should be 42");
-
-int main() {
-    if (CRAFTER_TEST_FOO != 42) return 1;
-    return 0;
-}
diff --git a/tests/Defines/test.toml b/tests/Defines/test.toml
deleted file mode 100644
index 78d6451..0000000
--- a/tests/Defines/test.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-# Smoke test for cfg.defines propagation. main.cpp consumes CRAFTER_TEST_FOO
-# both at compile time (static_assert) and at runtime; if the define doesn't
-# reach the compile, the test won't even build.
-[defines]
-CRAFTER_TEST_FOO = "42"
diff --git a/tests/Diamond/B/B.cppm b/tests/Diamond/B/B.cppm
deleted file mode 100644
index 88351c2..0000000
--- a/tests/Diamond/B/B.cppm
+++ /dev/null
@@ -1,6 +0,0 @@
-export module B;
-import X;
-
-export int BValue() {
-    return XValue() * 2;
-}
diff --git a/tests/Diamond/C/C.cppm b/tests/Diamond/C/C.cppm
deleted file mode 100644
index 18f3020..0000000
--- a/tests/Diamond/C/C.cppm
+++ /dev/null
@@ -1,6 +0,0 @@
-export module C;
-import X;
-
-export int CValue() {
-    return XValue() * 3;
-}
diff --git a/tests/Diamond/X/X.cppm b/tests/Diamond/X/X.cppm
deleted file mode 100644
index c059f0c..0000000
--- a/tests/Diamond/X/X.cppm
+++ /dev/null
@@ -1,5 +0,0 @@
-export module X;
-
-export int XValue() {
-    return 7;
-}
diff --git a/tests/Diamond/main.cpp b/tests/Diamond/main.cpp
deleted file mode 100644
index 7d687bb..0000000
--- a/tests/Diamond/main.cpp
+++ /dev/null
@@ -1,9 +0,0 @@
-import std;
-import B;
-import C;
-
-int main() {
-    if (BValue() != 14) return 1;  // X(7) * 2
-    if (CValue() != 21) return 1;  // X(7) * 3
-    return 0;
-}
diff --git a/tests/Diamond/project.cpp b/tests/Diamond/project.cpp
deleted file mode 100644
index 1a4e17c..0000000
--- a/tests/Diamond/project.cpp
+++ /dev/null
@@ -1,50 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-namespace {
-    std::unique_ptr<Configuration> MakeLib(std::string_view dir, std::string_view modName,
-                                           std::string_view target,
-                                           std::span<Configuration*> deps) {
-        auto lib = std::make_unique<Configuration>();
-        lib->path = std::format("tests/Diamond/{}/", dir);
-        lib->name = std::format("{}-Diamond-{}", modName, target);
-        lib->outputName = std::string(modName);
-        lib->target = std::string(target);
-        lib->type = ConfigurationType::LibraryStatic;
-        lib->dependencies.assign(deps.begin(), deps.end());
-        std::array<fs::path, 1> ifaces = { fs::path(modName) };
-        std::array<fs::path, 0> impls = {};
-        lib->GetInterfacesAndImplementations(ifaces, impls);
-        return lib;
-    }
-}
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    // Diamond exercises the build engine's dependency wiring at the host
-    // target. There's no cross-compile plumbing (no sysroot, no per-target
-    // toolchain), so we don't honor --target=. A real cross-arch test would
-    // live in its own tests/<Name>/test.toml.
-    std::string target = HostTarget();
-
-    static std::unique_ptr<Configuration> X, B, C;
-    X = MakeLib("X", "X", target, {});
-    Configuration* xDeps[] = { X.get() };
-    B = MakeLib("B", "B", target, xDeps);
-    C = MakeLib("C", "C", target, xDeps);
-    Configuration* mainDeps[] = { B.get(), C.get() };
-
-    Configuration cfg;
-    cfg.path = "tests/Diamond/";
-    cfg.name = "Diamond";
-    cfg.outputName = "diamond-app";
-    cfg.target = target;
-    cfg.type = ConfigurationType::Executable;
-    cfg.dependencies.assign(mainDeps, mainDeps + 2);
-
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "main" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-    return cfg;
-}
diff --git a/tests/HelloWorld/main.cpp b/tests/HelloWorld/main.cpp
deleted file mode 100644
index 92cf953..0000000
--- a/tests/HelloWorld/main.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-import std;
-
-int main() {
-    // hello-world is degenerate: the runner reports ✅ on exit 0, which is the
-    // signal that the build produced a runnable binary.
-    return 0;
-}
diff --git a/tests/Incremental/Incremental.cpp b/tests/Incremental/Incremental.cpp
deleted file mode 100644
index ae10c13..0000000
--- a/tests/Incremental/Incremental.cpp
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
-Crafter® Build
-Copyright (C) 2026 Catcrafts®
-Catcrafts.net
-
-LGPL-3.0-only.
-*/
-
-import std;
-import Crafter.Build;
-#include "../_shared/TestUtil.h"
-namespace fs = std::filesystem;
-using namespace std::chrono_literals;
-using namespace TestUtil;
-using namespace Crafter;
-
-int main() {
-    try {
-        fs::path src = fs::current_path() / "tests" / "Incremental" / "inner";
-        Configuration cfg = LoadFixture("Incremental", src);
-        fs::path work = fs::current_path();
-
-        auto cold = BuildOnce(cfg);
-        if (!cold.result.empty()) {
-            std::println(std::cerr, "cold build failed:\n{}", cold.result);
-            return 1;
-        }
-
-        fs::path greeterObj = cfg.BuildDir() / "Greeter.o";
-        fs::path mainObj    = cfg.BuildDir() / "main_impl.o";
-        if (!fs::exists(greeterObj) || !fs::exists(mainObj)) {
-            std::println(std::cerr, "expected .o files missing after cold build");
-            return 1;
-        }
-        auto greeter_t1 = fs::last_write_time(greeterObj);
-        auto main_t1    = fs::last_write_time(mainObj);
-
-        auto noop = BuildOnce(cfg);
-        if (!noop.result.empty()) {
-            std::println(std::cerr, "no-op rebuild failed:\n{}", noop.result);
-            return 1;
-        }
-        if (fs::last_write_time(greeterObj) != greeter_t1) {
-            std::println(std::cerr, "no-op rebuild regenerated Greeter.o");
-            return 1;
-        }
-        if (fs::last_write_time(mainObj) != main_t1) {
-            std::println(std::cerr, "no-op rebuild regenerated main_impl.o");
-            return 1;
-        }
-
-        // Touch main.cpp: only main_impl.o should regenerate.
-        fs::last_write_time(work / "main.cpp", std::chrono::file_clock::now() + 2s);
-        auto touched = BuildOnce(cfg);
-        if (!touched.result.empty()) {
-            std::println(std::cerr, "rebuild after touch failed:\n{}", touched.result);
-            return 1;
-        }
-        if (fs::last_write_time(greeterObj) != greeter_t1) {
-            std::println(std::cerr, "touching main.cpp unnecessarily rebuilt Greeter.o");
-            return 1;
-        }
-        if (fs::last_write_time(mainObj) <= main_t1) {
-            std::println(std::cerr, "touching main.cpp did NOT rebuild main_impl.o");
-            return 1;
-        }
-        return 0;
-    } catch (const std::exception& e) {
-        std::println(std::cerr, "test exception: {}", e.what());
-        return 1;
-    }
-}
diff --git a/tests/Incremental/inner/interfaces/Greeter.cppm b/tests/Incremental/inner/interfaces/Greeter.cppm
deleted file mode 100644
index 1294d98..0000000
--- a/tests/Incremental/inner/interfaces/Greeter.cppm
+++ /dev/null
@@ -1,6 +0,0 @@
-export module Greeter;
-import std;
-
-export std::string Greet(std::string_view name) {
-    return std::format("hello, {}!", name);
-}
diff --git a/tests/Incremental/inner/main.cpp b/tests/Incremental/inner/main.cpp
deleted file mode 100644
index b331987..0000000
--- a/tests/Incremental/inner/main.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-import std;
-import Greeter;
-
-int main() {
-    std::println("{}", Greet("crafter"));
-    return 0;
-}
diff --git a/tests/Incremental/inner/project.cpp b/tests/Incremental/inner/project.cpp
deleted file mode 100644
index 548399d..0000000
--- a/tests/Incremental/inner/project.cpp
+++ /dev/null
@@ -1,22 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "./";
-    cfg.name = "hello-mod";
-    cfg.outputName = "hello-mod";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-
-    std::array<fs::path, 1> ifaces = { "interfaces/Greeter" };
-    std::array<fs::path, 1> impls = { "main" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-
-    cfg.linkFlags.push_back("-Wl,--export-dynamic");
-    cfg.linkFlags.push_back("-ldl");
-
-    return cfg;
-}
diff --git a/tests/Incremental/project.cpp b/tests/Incremental/project.cpp
deleted file mode 100644
index e398462..0000000
--- a/tests/Incremental/project.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "tests/Incremental/";
-    cfg.name = "Incremental";
-    cfg.outputName = "Incremental";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-    cfg.dependencies = { ParentLib("crafter.build-lib") };
-    cfg.linkFlags.push_back("-Wl,--export-dynamic");
-    cfg.linkFlags.push_back("-ldl");
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "Incremental" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-    return cfg;
-}
diff --git a/tests/Libraries/Libraries.cpp b/tests/Libraries/Libraries.cpp
deleted file mode 100644
index 95df19f..0000000
--- a/tests/Libraries/Libraries.cpp
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
-Crafter® Build
-Copyright (C) 2026 Catcrafts®
-Catcrafts.net
-
-LGPL-3.0-only.
-*/
-
-import std;
-import Crafter.Build;
-#include "../_shared/TestUtil.h"
-namespace fs = std::filesystem;
-using namespace TestUtil;
-using namespace Crafter;
-
-int main() {
-    try {
-        fs::path src = fs::current_path() / "tests" / "Libraries" / "inner";
-        Configuration cfg = LoadFixture("Libraries", src);
-        fs::path work = fs::current_path();
-
-        auto br = BuildOnce(cfg);
-        if (!br.result.empty()) {
-            std::println(std::cerr, "build failed:\n{}", br.result);
-            return 1;
-        }
-
-        fs::path staticArchive = cfg.dependencies[0]->BinDir() / "libMathLib.a";
-        fs::path dynamicSO     = cfg.dependencies[1]->BinDir() / "libGreetLib.so";
-        fs::path artifact      = cfg.BinDir() / "libs-app";
-
-        if (!fs::exists(staticArchive)) {
-            std::println(std::cerr, "static archive missing at {}", staticArchive.string());
-            return 1;
-        }
-        if (!fs::exists(dynamicSO)) {
-            std::println(std::cerr, "dynamic .so missing at {}", dynamicSO.string());
-            return 1;
-        }
-        if (!fs::exists(artifact)) {
-            std::println(std::cerr, "exe missing at {}", artifact.string());
-            return 1;
-        }
-
-        // Linked against the dynamic .so which lives in greetlib/bin/...; set
-        // LD_LIBRARY_PATH explicitly for the artifact run.
-        auto run = RunInDir(work, std::format(
-            "LD_LIBRARY_PATH='{}' '{}'",
-            dynamicSO.parent_path().string(), artifact.string()));
-        if (run.exitCode != 0) {
-            std::println(std::cerr, "artifact exited nonzero (rc={}):\n{}", run.exitCode, run.output);
-            return 1;
-        }
-        if (run.output != "hi=42\n") {
-            std::println(std::cerr, "output mismatch:\n  expected: \"hi=42\\n\"\n  got: {:?}", run.output);
-            return 1;
-        }
-        return 0;
-    } catch (const std::exception& e) {
-        std::println(std::cerr, "test exception: {}", e.what());
-        return 1;
-    }
-}
diff --git a/tests/Libraries/inner/greetlib/GreetLib.cppm b/tests/Libraries/inner/greetlib/GreetLib.cppm
deleted file mode 100644
index ce2260f..0000000
--- a/tests/Libraries/inner/greetlib/GreetLib.cppm
+++ /dev/null
@@ -1,6 +0,0 @@
-export module GreetLib;
-import std;
-
-export std::string Greet() {
-    return "hi";
-}
diff --git a/tests/Libraries/inner/main.cpp b/tests/Libraries/inner/main.cpp
deleted file mode 100644
index 4268458..0000000
--- a/tests/Libraries/inner/main.cpp
+++ /dev/null
@@ -1,8 +0,0 @@
-import std;
-import MathLib;
-import GreetLib;
-
-int main() {
-    std::println("{}={}", Greet(), Add(40, 2));
-    return 0;
-}
diff --git a/tests/Libraries/inner/mathlib/MathLib.cppm b/tests/Libraries/inner/mathlib/MathLib.cppm
deleted file mode 100644
index 592c81a..0000000
--- a/tests/Libraries/inner/mathlib/MathLib.cppm
+++ /dev/null
@@ -1,5 +0,0 @@
-export module MathLib;
-
-export int Add(int a, int b) {
-    return a + b;
-}
diff --git a/tests/Libraries/inner/project.cpp b/tests/Libraries/inner/project.cpp
deleted file mode 100644
index 3fe42e0..0000000
--- a/tests/Libraries/inner/project.cpp
+++ /dev/null
@@ -1,47 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    static auto MathStatic = std::make_unique<Configuration>();
-    MathStatic->path = "./mathlib/";
-    MathStatic->name = "MathLib";
-    MathStatic->outputName = "MathLib";
-    MathStatic->target = "x86_64-pc-linux-gnu";
-    MathStatic->type = ConfigurationType::LibraryStatic;
-    {
-        std::array<fs::path, 1> ifaces = { "MathLib" };
-        std::array<fs::path, 0> impls = {};
-        MathStatic->GetInterfacesAndImplementations(ifaces, impls);
-    }
-
-    static auto GreetDynamic = std::make_unique<Configuration>();
-    GreetDynamic->path = "./greetlib/";
-    GreetDynamic->name = "GreetLib";
-    GreetDynamic->outputName = "GreetLib";
-    GreetDynamic->target = "x86_64-pc-linux-gnu";
-    GreetDynamic->type = ConfigurationType::LibraryDynamic;
-    {
-        std::array<fs::path, 1> ifaces = { "GreetLib" };
-        std::array<fs::path, 0> impls = {};
-        GreetDynamic->GetInterfacesAndImplementations(ifaces, impls);
-    }
-
-    Configuration app;
-    app.path = "./";
-    app.name = "libs-app";
-    app.outputName = "libs-app";
-    app.target = "x86_64-pc-linux-gnu";
-    app.type = ConfigurationType::Executable;
-    app.dependencies = { MathStatic.get(), GreetDynamic.get() };
-    {
-        std::array<fs::path, 0> ifaces = {};
-        std::array<fs::path, 1> impls = { "main" };
-        app.GetInterfacesAndImplementations(ifaces, impls);
-    }
-    app.linkFlags.push_back("-Wl,--export-dynamic");
-    app.linkFlags.push_back("-ldl");
-
-    return app;
-}
diff --git a/tests/Libraries/project.cpp b/tests/Libraries/project.cpp
deleted file mode 100644
index 1b5a963..0000000
--- a/tests/Libraries/project.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "tests/Libraries/";
-    cfg.name = "Libraries";
-    cfg.outputName = "Libraries";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-    cfg.dependencies = { ParentLib("crafter.build-lib") };
-    cfg.linkFlags.push_back("-Wl,--export-dynamic");
-    cfg.linkFlags.push_back("-ldl");
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "Libraries" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-    return cfg;
-}
diff --git a/tests/RunnerClassification/RunnerClassification.cpp b/tests/RunnerClassification/RunnerClassification.cpp
deleted file mode 100644
index b8dcbbf..0000000
--- a/tests/RunnerClassification/RunnerClassification.cpp
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
-Crafter® Build
-Copyright (C) 2026 Catcrafts®
-Catcrafts.net
-
-LGPL-3.0-only.
-*/
-
-import std;
-import Crafter.Build;
-#include "../_shared/TestUtil.h"
-namespace fs = std::filesystem;
-using namespace TestUtil;
-using namespace Crafter;
-
-int main() {
-    try {
-        fs::path src = fs::current_path() / "tests" / "RunnerClassification" / "inner";
-        Configuration cfg = LoadFixture("RunnerClassification", src);
-
-        RunTestsOptions opts;
-        opts.timeoutOverride = std::chrono::seconds(2);  // Hang test bounded
-        TestSummary summary = RunTests(cfg, opts);
-
-        if (summary.passed != 1 || summary.failed != 1 ||
-            summary.crashed != 1 || summary.timedOut != 1 || summary.skipped != 0) {
-            std::println(std::cerr,
-                "outcome counts mismatch: passed={} failed={} crashed={} timedOut={} skipped={}",
-                summary.passed, summary.failed, summary.crashed, summary.timedOut, summary.skipped);
-            return 1;
-        }
-        return 0;
-    } catch (const std::exception& e) {
-        std::println(std::cerr, "test exception: {}", e.what());
-        return 1;
-    }
-}
diff --git a/tests/RunnerClassification/inner/project.cpp b/tests/RunnerClassification/inner/project.cpp
deleted file mode 100644
index 841872f..0000000
--- a/tests/RunnerClassification/inner/project.cpp
+++ /dev/null
@@ -1,33 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "./";
-    cfg.name = "rc-meta";
-    cfg.outputName = "rc-meta";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-
-    auto addTest = [&](std::string name) {
-        Test t;
-        t.config.path = "./";
-        t.config.name = name;
-        t.config.outputName = name;
-        t.config.target = "x86_64-pc-linux-gnu";
-        t.config.type = ConfigurationType::Executable;
-        std::array<fs::path, 0> empty = {};
-        std::array<fs::path, 1> impls = { fs::path("tests") / name };
-        t.config.GetInterfacesAndImplementations(empty, impls);
-        cfg.tests.push_back(std::move(t));
-    };
-
-    addTest("Pass");
-    addTest("Fail");
-    addTest("Crash");
-    addTest("Hang");
-
-    return cfg;
-}
diff --git a/tests/RunnerClassification/inner/tests/Crash.cpp b/tests/RunnerClassification/inner/tests/Crash.cpp
deleted file mode 100644
index 2679e10..0000000
--- a/tests/RunnerClassification/inner/tests/Crash.cpp
+++ /dev/null
@@ -1,4 +0,0 @@
-int main() {
-    *(volatile int*)0 = 0;
-    return 0;
-}
diff --git a/tests/RunnerClassification/inner/tests/Fail.cpp b/tests/RunnerClassification/inner/tests/Fail.cpp
deleted file mode 100644
index 40cbb54..0000000
--- a/tests/RunnerClassification/inner/tests/Fail.cpp
+++ /dev/null
@@ -1 +0,0 @@
-int main() { return 1; }
diff --git a/tests/RunnerClassification/inner/tests/Hang.cpp b/tests/RunnerClassification/inner/tests/Hang.cpp
deleted file mode 100644
index 22630b6..0000000
--- a/tests/RunnerClassification/inner/tests/Hang.cpp
+++ /dev/null
@@ -1,3 +0,0 @@
-int main() {
-    for (;;) {}
-}
diff --git a/tests/RunnerClassification/inner/tests/Pass.cpp b/tests/RunnerClassification/inner/tests/Pass.cpp
deleted file mode 100644
index 76e8197..0000000
--- a/tests/RunnerClassification/inner/tests/Pass.cpp
+++ /dev/null
@@ -1 +0,0 @@
-int main() { return 0; }
diff --git a/tests/RunnerClassification/project.cpp b/tests/RunnerClassification/project.cpp
deleted file mode 100644
index 136afb5..0000000
--- a/tests/RunnerClassification/project.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "tests/RunnerClassification/";
-    cfg.name = "RunnerClassification";
-    cfg.outputName = "RunnerClassification";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-    cfg.dependencies = { ParentLib("crafter.build-lib") };
-    cfg.linkFlags.push_back("-Wl,--export-dynamic");
-    cfg.linkFlags.push_back("-ldl");
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "RunnerClassification" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-    return cfg;
-}
diff --git a/tests/Shader/Shader.cpp b/tests/Shader/Shader.cpp
deleted file mode 100644
index 1ee0c88..0000000
--- a/tests/Shader/Shader.cpp
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
-Crafter® Build
-Copyright (C) 2026 Catcrafts®
-Catcrafts.net
-
-LGPL-3.0-only.
-
-End-to-end shader build through the V2 pipeline:
-the inner project.cpp registers a vertex shader via cfg.shaders, and
-crafter.build-lib invokes glslang in-process to lower it to SPIR-V. The
-test verifies the resulting .spv file lands in the per-target bin dir
-and starts with the SPIR-V magic word — a zero-length output or one
-written under a different name would be flagged here rather than
-silently passing.
-*/
-
-import std;
-import Crafter.Build;
-#include "../_shared/TestUtil.h"
-namespace fs = std::filesystem;
-using namespace TestUtil;
-using namespace Crafter;
-
-int main() {
-    try {
-        fs::path src = fs::current_path() / "tests" / "Shader" / "inner";
-        Configuration cfg = LoadFixture("Shader", src);
-        fs::path work = fs::current_path();
-
-        auto br = BuildOnce(cfg);
-        if (!br.result.empty()) {
-            std::println(std::cerr, "build failed:\n{}", br.result);
-            return 1;
-        }
-
-        fs::path spv = cfg.BinDir() / "triangle.spv";
-        if (!fs::exists(spv)) {
-            std::println(std::cerr, "expected SPIR-V output missing at {}", spv.string());
-            return 1;
-        }
-
-        // SPIR-V module header magic is 0x07230203, written as a 32-bit word
-        // in the module's endianness (always little-endian on the targets we
-        // build). Matching the raw byte sequence catches truncated writes
-        // and any future regression that produces a non-SPIR-V .spv.
-        std::ifstream f(spv, std::ios::binary);
-        unsigned char magic[4] = {};
-        f.read(reinterpret_cast<char*>(magic), 4);
-        if (magic[0] != 0x03 || magic[1] != 0x02 || magic[2] != 0x23 || magic[3] != 0x07) {
-            std::println(std::cerr,
-                "SPIR-V magic mismatch: got {:#04x} {:#04x} {:#04x} {:#04x}",
-                magic[0], magic[1], magic[2], magic[3]);
-            return 1;
-        }
-
-        return 0;
-    } catch (const std::exception& e) {
-        std::println(std::cerr, "test exception: {}", e.what());
-        return 1;
-    }
-}
diff --git a/tests/Shader/inner/main.cpp b/tests/Shader/inner/main.cpp
deleted file mode 100644
index 54e275a..0000000
--- a/tests/Shader/inner/main.cpp
+++ /dev/null
@@ -1,3 +0,0 @@
-import std;
-
-int main() { return 0; }
diff --git a/tests/Shader/inner/project.cpp b/tests/Shader/inner/project.cpp
deleted file mode 100644
index 669e1d0..0000000
--- a/tests/Shader/inner/project.cpp
+++ /dev/null
@@ -1,21 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "./";
-    cfg.name = "shader-test";
-    cfg.outputName = "shader-test";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "main" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-
-    cfg.shaders.emplace_back("triangle.glsl", "main", ShaderType::Vertex);
-
-    return cfg;
-}
diff --git a/tests/Shader/inner/triangle.glsl b/tests/Shader/inner/triangle.glsl
deleted file mode 100644
index e1abf19..0000000
--- a/tests/Shader/inner/triangle.glsl
+++ /dev/null
@@ -1,13 +0,0 @@
-#version 450
-
-layout(location = 0) out vec3 color;
-
-void main() {
-    vec2 positions[3] = vec2[](
-        vec2( 0.0, -0.5),
-        vec2( 0.5,  0.5),
-        vec2(-0.5,  0.5)
-    );
-    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
-    color = vec3(1.0, 0.0, 0.0);
-}
diff --git a/tests/Shader/project.cpp b/tests/Shader/project.cpp
deleted file mode 100644
index 8dd624d..0000000
--- a/tests/Shader/project.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "tests/Shader/";
-    cfg.name = "Shader";
-    cfg.outputName = "Shader";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-    cfg.dependencies = { ParentLib("crafter.build-lib") };
-    cfg.linkFlags.push_back("-Wl,--export-dynamic");
-    cfg.linkFlags.push_back("-ldl");
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "Shader" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-    return cfg;
-}
diff --git a/tests/ShaderDep/ShaderDep.cpp b/tests/ShaderDep/ShaderDep.cpp
deleted file mode 100644
index 6809ef2..0000000
--- a/tests/ShaderDep/ShaderDep.cpp
+++ /dev/null
@@ -1,117 +0,0 @@
-/*
-Crafter® Build
-Copyright (C) 2026 Catcrafts®
-Catcrafts.net
-
-LGPL-3.0-only.
-
-Verifies that when an executable consumes a library that registers shaders
-or asset files, those runtime artifacts ship in the executable's bin dir
-alongside the binary — not just in the lib's own bin dir, where the runtime
-exe wouldn't find them. Covers a .spv (cfg.shaders), a flat asset
-(cfg.files file), and a directory tree (cfg.files dir).
-
-Also verifies cfg.buildFiles' include-path semantic: the consumer's own
-shader compile resolves `#include "ui-shared.glsl"` against the lib's
-buildFiles in-place from the dep's source tree (no copy), and the file is
-NOT mirrored into any build/bin dir.
-*/
-
-import std;
-import Crafter.Build;
-#include "../_shared/TestUtil.h"
-namespace fs = std::filesystem;
-using namespace TestUtil;
-using namespace Crafter;
-
-int main() {
-    try {
-        fs::path src = fs::current_path() / "tests" / "ShaderDep" / "inner";
-        Configuration cfg = LoadFixture("ShaderDep", src);
-
-        auto br = BuildOnce(cfg);
-        if (!br.result.empty()) {
-            std::println(std::cerr, "build failed:\n{}", br.result);
-            return 1;
-        }
-
-        fs::path libSpv = cfg.dependencies[0]->BinDir() / "triangle.spv";
-        fs::path appSpv = cfg.BinDir() / "triangle.spv";
-
-        if (!fs::exists(libSpv)) {
-            std::println(std::cerr, "lib .spv missing at {}", libSpv.string());
-            return 1;
-        }
-        if (!fs::exists(appSpv)) {
-            std::println(std::cerr, "exe .spv missing at {}", appSpv.string());
-            return 1;
-        }
-
-        std::ifstream f(appSpv, std::ios::binary);
-        unsigned char magic[4] = {};
-        f.read(reinterpret_cast<char*>(magic), 4);
-        if (magic[0] != 0x03 || magic[1] != 0x02 || magic[2] != 0x23 || magic[3] != 0x07) {
-            std::println(std::cerr,
-                "SPIR-V magic mismatch in exe-side copy: got {:#04x} {:#04x} {:#04x} {:#04x}",
-                magic[0], magic[1], magic[2], magic[3]);
-            return 1;
-        }
-
-        fs::path appAsset = cfg.BinDir() / "asset.txt";
-        if (!fs::exists(appAsset)) {
-            std::println(std::cerr, "exe-side asset.txt missing at {}", appAsset.string());
-            return 1;
-        }
-        if (ReadFile(appAsset) != "crafter-build asset\n") {
-            std::println(std::cerr, "asset.txt content mismatch at {}", appAsset.string());
-            return 1;
-        }
-
-        fs::path appNested = cfg.BinDir() / "data" / "nested.txt";
-        if (!fs::exists(appNested)) {
-            std::println(std::cerr, "exe-side data/nested.txt missing at {}", appNested.string());
-            return 1;
-        }
-        if (ReadFile(appNested) != "nested asset\n") {
-            std::println(std::cerr, "data/nested.txt content mismatch at {}", appNested.string());
-            return 1;
-        }
-
-        // The consumer shader includes a header from the lib's buildFiles.
-        // Successful build (above) means glslang resolved the include
-        // in-place from the dep's source tree — verify the resulting .spv
-        // and the SPIR-V magic, same as for the lib's shader.
-        fs::path consumerSpv = cfg.BinDir() / "consumer.spv";
-        if (!fs::exists(consumerSpv)) {
-            std::println(std::cerr, "consumer .spv missing at {}", consumerSpv.string());
-            return 1;
-        }
-        std::ifstream cf(consumerSpv, std::ios::binary);
-        unsigned char cmagic[4] = {};
-        cf.read(reinterpret_cast<char*>(cmagic), 4);
-        if (cmagic[0] != 0x03 || cmagic[1] != 0x02 || cmagic[2] != 0x23 || cmagic[3] != 0x07) {
-            std::println(std::cerr,
-                "SPIR-V magic mismatch in consumer.spv: got {:#04x} {:#04x} {:#04x} {:#04x}",
-                cmagic[0], cmagic[1], cmagic[2], cmagic[3]);
-            return 1;
-        }
-
-        // buildFiles must NOT be copied anywhere — they're read in place.
-        for (fs::path probe : {
-                cfg.BinDir() / "ui-shared.glsl",
-                cfg.BuildDir() / "ui-shared.glsl",
-                cfg.dependencies[0]->BinDir() / "ui-shared.glsl",
-                cfg.dependencies[0]->BuildDir() / "ui-shared.glsl",
-            }) {
-            if (fs::exists(probe)) {
-                std::println(std::cerr, "ui-shared.glsl unexpectedly copied to {}", probe.string());
-                return 1;
-            }
-        }
-
-        return 0;
-    } catch (const std::exception& e) {
-        std::println(std::cerr, "test exception: {}", e.what());
-        return 1;
-    }
-}
diff --git a/tests/ShaderDep/inner/consumer.glsl b/tests/ShaderDep/inner/consumer.glsl
deleted file mode 100644
index ce0a112..0000000
--- a/tests/ShaderDep/inner/consumer.glsl
+++ /dev/null
@@ -1,16 +0,0 @@
-#version 450
-#extension GL_GOOGLE_include_directive : require
-
-#include "ui-shared.glsl"
-
-layout(location = 0) out vec3 color;
-
-void main() {
-    vec2 positions[3] = vec2[](
-        vec2( 0.0, -0.5),
-        vec2( 0.5,  0.5),
-        vec2(-0.5,  0.5)
-    );
-    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
-    color = ui_color();
-}
diff --git a/tests/ShaderDep/inner/lib/ShaderLib.cppm b/tests/ShaderDep/inner/lib/ShaderLib.cppm
deleted file mode 100644
index f5b1bc1..0000000
--- a/tests/ShaderDep/inner/lib/ShaderLib.cppm
+++ /dev/null
@@ -1,3 +0,0 @@
-export module ShaderLib;
-
-export int Identify() { return 0; }
diff --git a/tests/ShaderDep/inner/lib/asset.txt b/tests/ShaderDep/inner/lib/asset.txt
deleted file mode 100644
index 835720c..0000000
--- a/tests/ShaderDep/inner/lib/asset.txt
+++ /dev/null
@@ -1 +0,0 @@
-crafter-build asset
diff --git a/tests/ShaderDep/inner/lib/data/nested.txt b/tests/ShaderDep/inner/lib/data/nested.txt
deleted file mode 100644
index 519d462..0000000
--- a/tests/ShaderDep/inner/lib/data/nested.txt
+++ /dev/null
@@ -1 +0,0 @@
-nested asset
diff --git a/tests/ShaderDep/inner/lib/triangle.glsl b/tests/ShaderDep/inner/lib/triangle.glsl
deleted file mode 100644
index e1abf19..0000000
--- a/tests/ShaderDep/inner/lib/triangle.glsl
+++ /dev/null
@@ -1,13 +0,0 @@
-#version 450
-
-layout(location = 0) out vec3 color;
-
-void main() {
-    vec2 positions[3] = vec2[](
-        vec2( 0.0, -0.5),
-        vec2( 0.5,  0.5),
-        vec2(-0.5,  0.5)
-    );
-    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
-    color = vec3(1.0, 0.0, 0.0);
-}
diff --git a/tests/ShaderDep/inner/lib/ui-shared.glsl b/tests/ShaderDep/inner/lib/ui-shared.glsl
deleted file mode 100644
index 7508d02..0000000
--- a/tests/ShaderDep/inner/lib/ui-shared.glsl
+++ /dev/null
@@ -1,8 +0,0 @@
-#ifndef UI_SHARED_GLSL
-#define UI_SHARED_GLSL
-
-vec3 ui_color() {
-    return vec3(0.25, 0.5, 1.0);
-}
-
-#endif
diff --git a/tests/ShaderDep/inner/main.cpp b/tests/ShaderDep/inner/main.cpp
deleted file mode 100644
index 2b7338b..0000000
--- a/tests/ShaderDep/inner/main.cpp
+++ /dev/null
@@ -1,4 +0,0 @@
-import std;
-import ShaderLib;
-
-int main() { return Identify(); }
diff --git a/tests/ShaderDep/inner/project.cpp b/tests/ShaderDep/inner/project.cpp
deleted file mode 100644
index 710ff07..0000000
--- a/tests/ShaderDep/inner/project.cpp
+++ /dev/null
@@ -1,37 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    static auto ShaderLib = std::make_unique<Configuration>();
-    ShaderLib->path = "./lib/";
-    ShaderLib->name = "ShaderLib";
-    ShaderLib->outputName = "ShaderLib";
-    ShaderLib->target = "x86_64-pc-linux-gnu";
-    ShaderLib->type = ConfigurationType::LibraryStatic;
-    {
-        std::array<fs::path, 1> ifaces = { "ShaderLib" };
-        std::array<fs::path, 0> impls = {};
-        ShaderLib->GetInterfacesAndImplementations(ifaces, impls);
-    }
-    ShaderLib->shaders.emplace_back("./lib/triangle.glsl", "main", ShaderType::Vertex);
-    ShaderLib->files.emplace_back("./lib/asset.txt");
-    ShaderLib->files.emplace_back("./lib/data");
-    ShaderLib->buildFiles.emplace_back("./lib/ui-shared.glsl");
-
-    Configuration app;
-    app.path = "./";
-    app.name = "shader-dep-app";
-    app.outputName = "shader-dep-app";
-    app.target = "x86_64-pc-linux-gnu";
-    app.type = ConfigurationType::Executable;
-    app.dependencies = { ShaderLib.get() };
-    {
-        std::array<fs::path, 0> ifaces = {};
-        std::array<fs::path, 1> impls = { "main" };
-        app.GetInterfacesAndImplementations(ifaces, impls);
-    }
-    app.shaders.emplace_back("./consumer.glsl", "main", ShaderType::Vertex);
-    return app;
-}
diff --git a/tests/ShaderDep/project.cpp b/tests/ShaderDep/project.cpp
deleted file mode 100644
index 045d72d..0000000
--- a/tests/ShaderDep/project.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "tests/ShaderDep/";
-    cfg.name = "ShaderDep";
-    cfg.outputName = "ShaderDep";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-    cfg.dependencies = { ParentLib("crafter.build-lib") };
-    cfg.linkFlags.push_back("-Wl,--export-dynamic");
-    cfg.linkFlags.push_back("-ldl");
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "ShaderDep" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-    return cfg;
-}
diff --git a/tests/UnitLib/main.cpp b/tests/UnitLib/main.cpp
deleted file mode 100644
index 91c6d70..0000000
--- a/tests/UnitLib/main.cpp
+++ /dev/null
@@ -1,27 +0,0 @@
-import std;
-import Crafter.Build;
-using namespace Crafter;
-
-int main() {
-    // Local() is the no-op runner — empty exec template, name "local".
-    if (TestRunner::Local().name != "local") return 1;
-
-    // FromSpec parses each known kind and labels it consistently.
-    auto cmd = TestRunner::FromSpec("cmd:wine");
-    if (!cmd || cmd->name != "cmd:wine") return 1;
-
-    auto local = TestRunner::FromSpec("local");
-    if (!local || local->name != "local") return 1;
-
-    // Empty input returns nullopt; anything else unrecognized throws.
-    // ssh/sshwin/wsl used to be valid specs; they're now bogus (issue #8).
-    if (TestRunner::FromSpec("")) return 1;
-    for (auto bogus : { "nonsense:thing", "ssh:somehost", "sshwin:winhost", "wsl" }) {
-        try {
-            TestRunner::FromSpec(bogus);
-            return 1;
-        } catch (const std::exception&) {}
-    }
-
-    return 0;
-}
diff --git a/tests/UnitLib/project.cpp b/tests/UnitLib/project.cpp
deleted file mode 100644
index 2f715ee..0000000
--- a/tests/UnitLib/project.cpp
+++ /dev/null
@@ -1,21 +0,0 @@
-import std;
-import Crafter.Build;
-namespace fs = std::filesystem;
-using namespace Crafter;
-
-extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
-    Configuration cfg;
-    cfg.path = "tests/UnitLib/";
-    cfg.name = "UnitLib";
-    cfg.outputName = "UnitLib";
-    cfg.target = "x86_64-pc-linux-gnu";
-    cfg.type = ConfigurationType::Executable;
-    cfg.dependencies = { ParentLib("crafter.build-lib") };
-    cfg.linkFlags.push_back("-Wl,--export-dynamic");
-    cfg.linkFlags.push_back("-ldl");
-
-    std::array<fs::path, 0> ifaces = {};
-    std::array<fs::path, 1> impls = { "main" };
-    cfg.GetInterfacesAndImplementations(ifaces, impls);
-    return cfg;
-}
diff --git a/tests/Wasi/main.cpp b/tests/Wasi/main.cpp
deleted file mode 100644
index 7eb35d2..0000000
--- a/tests/Wasi/main.cpp
+++ /dev/null
@@ -1,6 +0,0 @@
-import std;
-
-int main() {
-    std::println("Hello, WASI!");
-    return 0;
-}
diff --git a/tests/Wasi/test.toml b/tests/Wasi/test.toml
deleted file mode 100644
index 7f26732..0000000
--- a/tests/Wasi/test.toml
+++ /dev/null
@@ -1,7 +0,0 @@
-# WASI build via the WASI SDK's libc++ + the wasm32-wasip1 target. The
-# runner derivation routes the .wasm artifact through `wasmtime`.
-target = "wasm32-wasip1"
-requires = [
-    "tool:wasmtime",
-    "file:/usr/share/wasi-sysroot/share/libc++/v1/std.cppm",
-]
diff --git a/tests/WindowsViaWine/main.cpp b/tests/WindowsViaWine/main.cpp
deleted file mode 100644
index 69c75fd..0000000
--- a/tests/WindowsViaWine/main.cpp
+++ /dev/null
@@ -1,6 +0,0 @@
-import std;
-
-int main() {
-    std::println("hi from win{}", sizeof(void*) * 8);
-    return 0;
-}
diff --git a/tests/WindowsViaWine/test.toml b/tests/WindowsViaWine/test.toml
deleted file mode 100644
index e5c8ef8..0000000
--- a/tests/WindowsViaWine/test.toml
+++ /dev/null
@@ -1,9 +0,0 @@
-# Linux→Windows end-to-end:
-# crafter-build cross-compiles main.cpp to x86_64-w64-mingw32 (.exe) and the
-# runner derivation wraps it in `wine`. Replaces the old WindowsViaSsh test,
-# which required a reachable Windows VM and an ssh + cmd.exe shell chain.
-target = "x86_64-w64-mingw32"
-requires = [
-    "tool:wine",
-    "tool:x86_64-w64-mingw32-g++",
-]
diff --git a/tests/WithModule/interfaces/Greeter.cppm b/tests/WithModule/interfaces/Greeter.cppm
deleted file mode 100644
index 1294d98..0000000
--- a/tests/WithModule/interfaces/Greeter.cppm
+++ /dev/null
@@ -1,6 +0,0 @@
-export module Greeter;
-import std;
-
-export std::string Greet(std::string_view name) {
-    return std::format("hello, {}!", name);
-}
diff --git a/tests/WithModule/main.cpp b/tests/WithModule/main.cpp
deleted file mode 100644
index e48a400..0000000
--- a/tests/WithModule/main.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-import std;
-import Greeter;
-
-int main() {
-    if (Greet("crafter") != "hello, crafter!") return 1;
-    return 0;
-}
diff --git a/tests/_shared/TestUtil.h b/tests/_shared/TestUtil.h
deleted file mode 100644
index f810280..0000000
--- a/tests/_shared/TestUtil.h
+++ /dev/null
@@ -1,76 +0,0 @@
-#pragma once
-#include <stdlib.h>  // setenv (POSIX, not in `import std`)
-
-namespace TestUtil {
-    // Exit code 77 follows the autoconf convention. crafter-build's test
-    // runner maps it to TestOutcome::Skipped and renders the test's stdout
-    // as the reason. Use this when the test discovers at runtime that its
-    // preconditions aren't met (tool missing, env unset, etc).
-    [[noreturn]] inline void Skip(std::string_view reason) {
-        std::print("{}", reason);
-        std::exit(77);
-    }
-
-    inline std::string ReadFile(const std::filesystem::path& p) {
-        std::ifstream f(p);
-        std::stringstream ss;
-        ss << f.rdbuf();
-        return ss.str();
-    }
-
-    inline std::filesystem::path CopyFixtureToTemp(std::string_view testName, const std::filesystem::path& source) {
-        namespace fs = std::filesystem;
-        fs::path tmp = fs::temp_directory_path() / std::format("crafter-test-{}", testName);
-        fs::remove_all(tmp);
-        fs::copy(source, tmp, fs::copy_options::recursive);
-        return tmp;
-    }
-
-    struct CmdResult {
-        int exitCode;
-        std::string output;
-    };
-
-    inline CmdResult RunInDir(const std::filesystem::path& cwd, std::string_view command) {
-        namespace fs = std::filesystem;
-        // Log inside cwd so parallel test drivers don't trample each other.
-        fs::path log = cwd / ".crafter-cmd-output.log";
-        std::string cmd = std::format("cd '{}' && {} > '{}' 2>&1",
-            cwd.string(), command, log.string());
-        int rc = std::system(cmd.c_str());
-        std::string out = ReadFile(log);
-        std::error_code ec;
-        fs::remove(log, ec);
-        return {rc, std::move(out)};
-    }
-
-    // Build cfg with a fresh dep cache. Convenient for outer-driver tests that
-    // exercise the build API in-process and don't need to share the dep cache
-    // across multiple Build() calls.
-    inline Crafter::BuildResult BuildOnce(Crafter::Configuration& cfg) {
-        std::unordered_map<std::filesystem::path, std::shared_future<Crafter::BuildResult>> depResults;
-        std::mutex depMutex;
-        return Crafter::Build(cfg, depResults, depMutex);
-    }
-
-    // Copy a fixture into a fresh temp dir, chdir there (so cfg.path = "./"
-    // inside the inner project.cpp resolves to the temp dir), and load its
-    // project.cpp. Common prep for in-process build/test API tests.
-    //
-    // Also sets CRAFTER_BUILD_HOME to <projectRoot>/share/crafter-build before
-    // loading. The lib's default sourceDir is derived from /proc/self/exe, but
-    // test exes live in tests/<Name>/bin/... rather than next to the project's
-    // share/, so the default lookup misses. The test runner launches tests
-    // with cwd = project root, so we capture that here before the chdir below.
-    inline Crafter::Configuration LoadFixture(std::string_view testName,
-                                              const std::filesystem::path& source,
-                                              std::span<const std::string_view> args = {}) {
-        auto projectRoot = std::filesystem::current_path();
-        auto sharePath = projectRoot / "share" / "crafter-build";
-        ::setenv("CRAFTER_BUILD_HOME", sharePath.string().c_str(), 1);
-
-        auto work = CopyFixtureToTemp(testName, source);
-        std::filesystem::current_path(work);
-        return Crafter::LoadProject("project.cpp", args);
-    }
-}