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-rw-r--r--python/subunit/tests/test_output_filter.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/python/subunit/tests/test_output_filter.py b/python/subunit/tests/test_output_filter.py
index 758110e..c6caada 100644
--- a/python/subunit/tests/test_output_filter.py
+++ b/python/subunit/tests/test_output_filter.py
@@ -134,7 +134,7 @@ class TestStatusArgParserTests(WithScenarios, TestCaseWithPatchedStderr):
self.assertThat(
fn,
raises(RuntimeError('subunit-output: error: argument %s: must '
- 'specify a single TEST_ID.\n'))
+ 'specify a single TEST_ID.\n' % self.option))
)