Add a test emulating pytest-cov

1 files changed, 29 insertions, 2 deletions

diff --git a/tests/test_api.py b/tests/test_api.py
index 88da3468..05bde67c 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -704,8 +704,6 @@ class TestRunnerPluginTest(CoverageTest):
     """
     def pretend_to_be_nose_with_cover(self, erase):
         """This is what the nose --with-cover plugin does."""
-        cov = coverage.Coverage()
-
         self.make_file("no_biggie.py", """\
             a = 1
             b = 2
@@ -713,6 +711,7 @@ class TestRunnerPluginTest(CoverageTest):
                 c = 4
             """)
 
+        cov = coverage.Coverage()
         if erase:
             cov.combine()
             cov.erase()
@@ -733,6 +732,34 @@ class TestRunnerPluginTest(CoverageTest):
     def test_nose_plugin_with_erase(self):
         self.pretend_to_be_nose_with_cover(erase=True)
 
+    def test_pytestcov_parallel(self):
+        self.make_file("prog.py", """\
+            a = 1
+            b = 2
+            if b == 1:
+                c = 4
+            """)
+        self.make_file(".coveragerc", """\
+            [run]
+            parallel = True
+            source = .
+            """)
+
+        cov = coverage.Coverage(source=None, branch=None, config_file='.coveragerc')
+        cov.erase()
+        self.start_import_stop(cov, "prog")
+        cov.combine()
+        cov.save()
+        report = StringIO()
+        cov.report(show_missing=None, ignore_errors=True, file=report, skip_covered=None)
+        self.assertEqual(report.getvalue(), textwrap.dedent("""\
+            Name      Stmts   Miss  Cover
+            -----------------------------
+            prog.py       4      1    75%
+            """))
+        self.assert_file_count(".coverage", 0)
+        self.assert_file_count(".coverage.*", 1)
+
 
 class ReporterDeprecatedAttributeTest(CoverageTest):
     """Test that Reporter.file_reporters has been deprecated."""