Add option to trace to run modules (GH-5134)

Adds a new option in trace that allows tracing runnable modules. It is
exposed as `--module module_name` as `-m` is already in use for another
argument.

1 files changed, 6 insertions, 1 deletions

diff --git a/Lib/test/test_trace.py b/Lib/test/test_trace.py
index afe7902676..4bc21eae02 100644
--- a/Lib/test/test_trace.py
+++ b/Lib/test/test_trace.py
@@ -474,7 +474,7 @@ class TestCommandLine(unittest.TestCase):
 
     def test_failures(self):
         _errors = (
-            (b'filename is missing: required with the main options', '-l', '-T'),
+            (b'progname is missing: required with the main options', '-l', '-T'),
             (b'cannot specify both --listfuncs and (--trace or --count)', '-lc'),
             (b'argument -R/--no-report: not allowed with argument -r/--report', '-rR'),
             (b'must specify one of --trace, --count, --report, --listfuncs, or --trackcalls', '-g'),
@@ -524,5 +524,10 @@ class TestCommandLine(unittest.TestCase):
         self.assertIn('lines   cov%   module   (path)', stdout)
         self.assertIn(f'6   100%   {TESTFN}   ({filename})', stdout)
 
+    def test_run_as_module(self):
+        assert_python_ok('-m', 'trace', '-l', '--module', 'timeit', '-n', '1')
+        assert_python_failure('-m', 'trace', '-l', '--module', 'not_a_module_zzz')
+
+
 if __name__ == '__main__':
     unittest.main()