Add tests

Author: stefanv

spin/tests/test_build_cmds.py

@@ -147,3 +147,22 @@ def test_lldb():
         "--batch",
     )
     assert "hi" in stdout(p)
+
+
+def test_parallel_builds():
+    spin("build")
+    spin("build", "-C", "parallel-build")
+    p = spin("python", "--", "-c", "import example_pkg; print(example_pkg.__file__)")
+    example_pkg_path = stdout(p).split("\n")[-1]
+    p = spin(
+        "python",
+        "-C",
+        "parallel-build",
+        "--",
+        "-c",
+        "import example_pkg; print(example_pkg.__file__)",
+    )
+    example_pkg_parallel_path = stdout(p).split("\n")[-1]
+    assert "build-install" in example_pkg_path
+    assert "parallel-build-install" in example_pkg_parallel_path
+    assert "parallel-build-install" not in example_pkg_path