more tests

tests/Cuda/inner/kernel.cu

@@ -0,0 +1,16 @@
+// 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;
+}