Control the test better; don't use os when cleaning up the path

1 files changed, 25 insertions, 20 deletions

diff --git a/test/test_process.py b/test/test_process.py
index e62fce22..1bdb1400 100644
--- a/test/test_process.py
+++ b/test/test_process.py
@@ -292,23 +292,28 @@ class ProcessTest(CoverageTest):
         self.assertTrue("No module named no_such_module" in out)
         self.assertTrue("warning" not in out)
 
-    if sys.version_info >= (2, 7):   # Need coverage runnable as a module.
-        def test_fullcoverage(self):
-            # fullcoverage is a trick to get stdlib modules measured from the
-            # very beginning of the process. Here we import os and then check
-            # how many lines are measured. 
-            self.make_file("getenv.py", """\
-                import os
-                print("FOOEY == %s" % os.getenv("FOOEY"))
-                """)
-
-            fullcov = os.path.join(os.path.dirname(coverage.__file__), "fullcoverage")
-            self.set_environ("FOOEY", "BOO")
-            self.set_environ("PYTHONPATH", fullcov)
-            out = self.run_command("python -m coverage run -L getenv.py")
-            self.assertEqual(out, "FOOEY == BOO\n")
-            data = coverage.CoverageData()
-            data.read_file(".coverage")
-            # The actual number of lines in os.py executed when it is imported
-            # is 120 or so.  Just running os.getenv executes about 5.
-            self.assertGreater(data.summary()['os.py'], 50)
+    if sys.version_info >= (3, 0):   # This only works on 3.x for now.
+        # It only works with the C tracer.
+        if os.getenv('COVERAGE_TEST_TRACER', 'c') == 'c':
+            def test_fullcoverage(self):
+                # fullcoverage is a trick to get stdlib modules measured from
+                # the very beginning of the process. Here we import os and
+                # then check how many lines are measured.
+                self.make_file("getenv.py", """\
+                    import os
+                    print("FOOEY == %s" % os.getenv("FOOEY"))
+                    """)
+
+                fullcov = os.path.join(
+                    os.path.dirname(coverage.__file__), "fullcoverage"
+                    )
+                self.set_environ("FOOEY", "BOO")
+                self.set_environ("PYTHONPATH", fullcov)
+                out = self.run_command("python -m coverage run -L getenv.py")
+                self.assertEqual(out, "FOOEY == BOO\n")
+                data = coverage.CoverageData()
+                data.read_file(".coverage")
+                # The actual number of executed lines in os.py when it's
+                # imported is 120 or so.  Just running os.getenv executes
+                # about 5.
+                self.assertGreater(data.summary()['os.py'], 50)