'coverage debug sys' shows the python executable, and there's a test that our subprocesses use the same one we do.

1 files changed, 17 insertions, 0 deletions

diff --git a/test/test_testing.py b/test/test_testing.py
index 9943b65c..1ea3232f 100644
--- a/test/test_testing.py
+++ b/test/test_testing.py
@@ -167,3 +167,20 @@ class CoverageTestTest(CoverageTest):
             AssertionError, self.assert_doesnt_exist, "whoville.txt"
             )
         self.assertRaises(AssertionError, self.assert_exists, "shadow.txt")
+
+    def test_sub_python_is_this_python(self):
+        # Try it with a python command.
+        self.make_file("showme.py", """\
+            import os, sys
+            print(sys.executable)
+            print(os.__file__)
+            """)
+        out = self.run_command("python showme.py").splitlines()
+        self.assertEqual(out[0], sys.executable)
+        self.assertEqual(out[1], os.__file__)
+
+        # Try it with a "coverage debug sys" command.
+        out = self.run_command("coverage debug sys").splitlines()
+        executable = [l for l in out if "executable:" in l][0]
+        executable = executable.split(":", 1)[1].strip()
+        self.assertEqual(executable, sys.executable)