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-rw-r--r--Lib/test/test_json/test_tool.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/test/test_json/test_tool.py b/Lib/test/test_json/test_tool.py
index 72cde3f0d6c..9ea2679c77e 100644
--- a/Lib/test/test_json/test_tool.py
+++ b/Lib/test/test_json/test_tool.py
@@ -160,7 +160,7 @@ class TestMain(unittest.TestCase):
rc, out, err = assert_python_ok('-m', self.module, '-h',
PYTHON_COLORS='0')
self.assertEqual(rc, 0)
- self.assertTrue(out.startswith(b'usage: '))
+ self.assertStartsWith(out, b'usage: ')
self.assertEqual(err, b'')
def test_sort_keys_flag(self):