Fix __main__.py showing up in help output

2 files changed, 11 insertions, 0 deletions

diff --git a/coverage/cmdline.py b/coverage/cmdline.py
index fdf1c3d..e2b79fe 100644
--- a/coverage/cmdline.py
+++ b/coverage/cmdline.py
@@ -399,6 +399,8 @@ class CoverageScript(object):
         self.coverage = None
 
         self.program_name = os.path.basename(sys.argv[0])
+        if self.program_name == '__main__.py':
+            self.program_name = 'coverage'
         if env.WINDOWS:
             # entry_points={'console_scripts':...} on Windows makes files
             # called coverage.exe, coverage3.exe, and coverage-3.5.exe. These
diff --git a/tests/test_process.py b/tests/test_process.py
index 55dc3b1..e40c4dc 100644
--- a/tests/test_process.py
+++ b/tests/test_process.py
@@ -733,6 +733,15 @@ class ProcessTest(CoverageTest):
             "Coverage.py warning: Module foo was previously imported, but not measured.\n"
         )
 
+    def test_module_name(self):
+        if sys.version_info < (2, 7):
+            # Python 2.6 thinks that coverage is a package that can't be
+            # executed
+            self.skip("-m doesn't work the same < Python 2.7")
+        # https://bitbucket.org/ned/coveragepy/issues/478/help-shows-silly-program-name-when-running
+        out = self.run_command("python -m coverage")
+        self.assertIn("Use 'coverage help' for help", out)
+
 
 class AliasedCommandTest(CoverageTest):
     """Tests of the version-specific command aliases."""