Move netfx tests to individual subprocesses

tests/test_common.py

@@ -76,27 +76,15 @@ def test_coreclr(example_netcore: Path):
 
 
 def test_coreclr_properties(example_netcore: Path):
-    from multiprocessing import get_context
-
-    p = get_context("spawn").Process(
-        target=_do_test_coreclr_autogenerated_runtimeconfig,
-        args=(example_netstandard,),
-        kwargs=dict(properties=dict(APP_CONTEXT_BASE_DIRECTORY=str(example_netcore))),
+    run_in_subprocess(
+        _do_test_coreclr_autogenerated_runtimeconfig,
+        example_netstandard,
+        properties=dict(APP_CONTEXT_BASE_DIRECTORY=str(example_netcore)),
     )
-    p.start()
-    p.join()
-    p.close()
 
 
 def test_coreclr_autogenerated_runtimeconfig(example_netstandard: Path):
-    from multiprocessing import get_context
-
-    p = get_context("spawn").Process(
-        target=_do_test_coreclr_autogenerated_runtimeconfig, args=(example_netstandard,)
-    )
-    p.start()
-    p.join()
-    p.close()
+    run_in_subprocess(_do_test_coreclr_autogenerated_runtimeconfig, example_netstandard)
 
 
 def _do_test_coreclr_autogenerated_runtimeconfig(
@@ -114,37 +102,31 @@ def _do_test_coreclr_autogenerated_runtimeconfig(
     sys.platform != "win32", reason=".NET Framework only exists on Windows"
 )
 def test_netfx(example_netstandard: Path):
-    from clr_loader import get_netfx
-
-    netfx = get_netfx()
-    asm = netfx.get_assembly(example_netstandard / "example.dll")
-
-    run_tests(asm)
+    run_in_subprocess(_do_test_netfx, example_netstandard)
 
 
 @pytest.mark.skipif(
     sys.platform != "win32", reason=".NET Framework only exists on Windows"
 )
 def test_netfx_chinese_path(example_netstandard: Path, tmpdir_factory):
-    from clr_loader import get_netfx
-
     tmp_path = Path(tmpdir_factory.mktemp("example-中国"))
     shutil.copytree(example_netstandard, tmp_path, dirs_exist_ok=True)
 
-    netfx = get_netfx()
-    asm = netfx.get_assembly(os.path.join(example_netstandard, "example.dll"))
-
-    run_tests(asm)
+    run_in_subprocess(_do_test_netfx, tmp_path)
 
 
 @pytest.mark.skipif(
     sys.platform != "win32", reason=".NET Framework only exists on Windows"
 )
 def test_netfx_separate_domain(example_netstandard):
+    run_in_subprocess(_do_test_netfx, example_netstandard, domain="some domain")
+
+
+def _do_test_netfx(example_netstandard, **kwargs):
     from clr_loader import get_netfx
 
-    netfx = get_netfx(domain="some_domain")
-    asm = netfx.get_assembly(os.path.join(example_netstandard, "example.dll"))
+    netfx = get_netfx(**kwargs)
+    asm = netfx.get_assembly(example_netstandard / "example.dll")
 
     run_tests(asm)
 
@@ -154,3 +136,12 @@ def run_tests(asm):
     test_data = b"testy mctestface"
     res = func(test_data)
     assert res == len(test_data)
+
+
+def run_in_subprocess(func, *args, **kwargs):
+    from multiprocessing import get_context
+
+    p = get_context("spawn").Process(target=func, args=args, kwargs=kwargs)
+    p.start()
+    p.join()
+    p.close()