A work-in-progress for #207, a minor improvement, and a commented-out test that shows the problem.

2 files changed, 10 insertions, 1 deletions

diff --git a/coverage/execfile.py b/coverage/execfile.py
index 3283a3f7..587c2d3c 100644
--- a/coverage/execfile.py
+++ b/coverage/execfile.py
@@ -110,7 +110,7 @@ def run_python_file(filename, args, package=None):
 
         # We have the source.  `compile` still needs the last line to be clean,
         # so make sure it is, then compile a code object from it.
-        if source[-1] != '\n':
+        if not source or source[-1] != '\n':
             source += '\n'
         code = compile(source, filename, "exec")
 
diff --git a/test/test_process.py b/test/test_process.py
index c1134946..473dafb1 100644
--- a/test/test_process.py
+++ b/test/test_process.py
@@ -290,6 +290,15 @@ class ProcessTest(CoverageTest):
             out2 = self.run_command("python -m test.try_execfile")
             self.assertMultiLineEqual(out, out2)
 
+    if 0:
+        # For https://bitbucket.org/ned/coveragepy/issue/207
+        def test_coverage_run_dashm_is_like_python_dashm_with__main__(self):
+            self.make_file("package/__init__.py")   # empty
+            self.make_file("package/__main__.py", "#\n")   # empty
+            out = self.run_command("coverage run -m package")
+            out2 = self.run_command("python -m package")
+            self.assertMultiLineEqual(out, out2)
+
     if hasattr(os, 'fork'):
         def test_fork(self):
             self.make_file("fork.py", """\