Provide a more useful error message if failing to run a non-Python file. #514

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/test_execfile.py b/tests/test_execfile.py
index 889d6cfd..8585b16d 100644
--- a/tests/test_execfile.py
+++ b/tests/test_execfile.py
@@ -145,6 +145,25 @@ class RunPycFileTest(CoverageTest):
         with self.assertRaisesRegex(NoCode, "No file to run: 'xyzzy.pyc'"):
             run_python_file("xyzzy.pyc", [])
 
+    def test_running_py_from_binary(self):
+        # Use make_file to get the bookkeeping. Ideally, it would
+        # be able to write binary files.
+        bf = self.make_file("binary")
+        with open(bf, "wb") as f:
+            f.write(b'\x7fELF\x02\x01\x01\x00\x00\x00')
+
+        msg = (
+            r"Couldn't run 'binary' as Python code: "
+            r"(TypeError|ValueError): "
+            r"("
+            r"compile\(\) expected string without null bytes"    # for py2
+            r"|"
+            r"source code string cannot contain null bytes"     # for py3
+            r")"
+        )
+        with self.assertRaisesRegex(Exception, msg):
+            run_python_file(bf, [bf])
+
 
 class RunModuleTest(CoverageTest):
     """Test run_python_module."""