Merge branch 'main' into feature/local-schemesfeature/local-schemes

1 files changed, 138 insertions, 0 deletions

diff --git a/setuptools/_distutils/tests/test_msvccompiler.py b/setuptools/_distutils/tests/test_msvccompiler.py
new file mode 100644
index 00000000..46a51cd0
--- /dev/null
+++ b/setuptools/_distutils/tests/test_msvccompiler.py
@@ -0,0 +1,138 @@
+"""Tests for distutils._msvccompiler."""
+import sys
+import unittest
+import os
+import threading
+
+from distutils.errors import DistutilsPlatformError
+from distutils.tests import support
+from test.support import run_unittest
+
+
+SKIP_MESSAGE = (None if sys.platform == "win32" else
+                "These tests are only for win32")
+
+@unittest.skipUnless(SKIP_MESSAGE is None, SKIP_MESSAGE)
+class msvccompilerTestCase(support.TempdirManager,
+                            unittest.TestCase):
+
+    def test_no_compiler(self):
+        import distutils._msvccompiler as _msvccompiler
+        # makes sure query_vcvarsall raises
+        # a DistutilsPlatformError if the compiler
+        # is not found
+        def _find_vcvarsall(plat_spec):
+            return None, None
+
+        old_find_vcvarsall = _msvccompiler._find_vcvarsall
+        _msvccompiler._find_vcvarsall = _find_vcvarsall
+        try:
+            self.assertRaises(DistutilsPlatformError,
+                              _msvccompiler._get_vc_env,
+                             'wont find this version')
+        finally:
+            _msvccompiler._find_vcvarsall = old_find_vcvarsall
+
+    def test_get_vc_env_unicode(self):
+        import distutils._msvccompiler as _msvccompiler
+
+        test_var = 'ṰḖṤṪ┅ṼẨṜ'
+        test_value = '₃⁴₅'
+
+        # Ensure we don't early exit from _get_vc_env
+        old_distutils_use_sdk = os.environ.pop('DISTUTILS_USE_SDK', None)
+        os.environ[test_var] = test_value
+        try:
+            env = _msvccompiler._get_vc_env('x86')
+            self.assertIn(test_var.lower(), env)
+            self.assertEqual(test_value, env[test_var.lower()])
+        finally:
+            os.environ.pop(test_var)
+            if old_distutils_use_sdk:
+                os.environ['DISTUTILS_USE_SDK'] = old_distutils_use_sdk
+
+    def test_get_vc2017(self):
+        import distutils._msvccompiler as _msvccompiler
+
+        # This function cannot be mocked, so pass it if we find VS 2017
+        # and mark it skipped if we do not.
+        version, path = _msvccompiler._find_vc2017()
+        if version:
+            self.assertGreaterEqual(version, 15)
+            self.assertTrue(os.path.isdir(path))
+        else:
+            raise unittest.SkipTest("VS 2017 is not installed")
+
+    def test_get_vc2015(self):
+        import distutils._msvccompiler as _msvccompiler
+
+        # This function cannot be mocked, so pass it if we find VS 2015
+        # and mark it skipped if we do not.
+        version, path = _msvccompiler._find_vc2015()
+        if version:
+            self.assertGreaterEqual(version, 14)
+            self.assertTrue(os.path.isdir(path))
+        else:
+            raise unittest.SkipTest("VS 2015 is not installed")
+
+
+class CheckThread(threading.Thread):
+    exc_info = None
+
+    def run(self):
+        try:
+            super().run()
+        except Exception:
+            self.exc_info = sys.exc_info()
+
+    def __bool__(self):
+        return not self.exc_info
+
+
+class TestSpawn(unittest.TestCase):
+    def test_concurrent_safe(self):
+        """
+        Concurrent calls to spawn should have consistent results.
+        """
+        import distutils._msvccompiler as _msvccompiler
+        compiler = _msvccompiler.MSVCCompiler()
+        compiler._paths = "expected"
+        inner_cmd = 'import os; assert os.environ["PATH"] == "expected"'
+        command = ['python', '-c', inner_cmd]
+
+        threads = [
+            CheckThread(target=compiler.spawn, args=[command])
+            for n in range(100)
+        ]
+        for thread in threads:
+            thread.start()
+        for thread in threads:
+            thread.join()
+        assert all(threads)
+
+    def test_concurrent_safe_fallback(self):
+        """
+        If CCompiler.spawn has been monkey-patched without support
+        for an env, it should still execute.
+        """
+        import distutils._msvccompiler as _msvccompiler
+        from distutils import ccompiler
+        compiler = _msvccompiler.MSVCCompiler()
+        compiler._paths = "expected"
+
+        def CCompiler_spawn(self, cmd):
+            "A spawn without an env argument."
+            assert os.environ["PATH"] == "expected"
+
+        with unittest.mock.patch.object(
+                ccompiler.CCompiler, 'spawn', CCompiler_spawn):
+            compiler.spawn(["n/a"])
+
+        assert os.environ.get("PATH") != "expected"
+
+
+def test_suite():
+    return unittest.makeSuite(msvccompilerTestCase)
+
+if __name__ == "__main__":
+    run_unittest(test_suite())