fix: only accept known values for --format

2 files changed, 11 insertions, 0 deletions

diff --git a/tests/test_cmdline.py b/tests/test_cmdline.py
index 378c901d..96e7ffb9 100644
--- a/tests/test_cmdline.py
+++ b/tests/test_cmdline.py
@@ -585,6 +585,11 @@ class CmdLineTest(BaseCmdLineTest):
             cov.load()
             cov.report(show_missing=None)
             """)
+        self.cmd_executes("report --format=markdown", """\
+            cov = Coverage()
+            cov.load()
+            cov.report(output_format="markdown")
+            """)
 
     def test_run(self):
         # coverage run [-p] [-L] [--timid] MODULE.py [ARG1 ARG2 ...]
diff --git a/tests/test_summary.py b/tests/test_summary.py
index 82508de8..f0f16aa2 100644
--- a/tests/test_summary.py
+++ b/tests/test_summary.py
@@ -1001,3 +1001,9 @@ class SummaryReporterConfigurationTest(CoverageTest):
         msg = "Invalid sorting option: 'Xyzzy'"
         with pytest.raises(ConfigError, match=msg):
             self.get_summary_text(('report:sort', 'Xyzzy'))
+
+    def test_report_with_invalid_format(self):
+        # Ask for an invalid format.
+        msg = "Unknown report format choice: 'xyzzy'"
+        with pytest.raises(ConfigError, match=msg):
+            self.get_summary_text(('report:format', 'xyzzy'))