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-rw-r--r--Lib/test/test_format.py19
1 files changed, 19 insertions, 0 deletions
diff --git a/Lib/test/test_format.py b/Lib/test/test_format.py
index bd159f5..9f7630c 100644
--- a/Lib/test/test_format.py
+++ b/Lib/test/test_format.py
@@ -307,6 +307,25 @@ class FormatTest(unittest.TestCase):
finally:
locale.setlocale(locale.LC_ALL, oldloc)
+ @support.cpython_only
+ def test_optimisations(self):
+ text = "abcde" # 5 characters
+
+ self.assertIs("%s" % text, text)
+ self.assertIs("%.5s" % text, text)
+ self.assertIs("%.10s" % text, text)
+ self.assertIs("%1s" % text, text)
+ self.assertIs("%5s" % text, text)
+
+ self.assertIs("{0}".format(text), text)
+ self.assertIs("{0:s}".format(text), text)
+ self.assertIs("{0:.5s}".format(text), text)
+ self.assertIs("{0:.10s}".format(text), text)
+ self.assertIs("{0:1s}".format(text), text)
+ self.assertIs("{0:5s}".format(text), text)
+
+ self.assertIs(text % (), text)
+ self.assertIs(text.format(), text)
def test_main():