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authorEric Smith <eric@trueblade.com>2008-03-18 15:35:27 (GMT)
committerEric Smith <eric@trueblade.com>2008-03-18 15:35:27 (GMT)
commit799c3004553f6f09105addf7ea46165ef3ffc34b (patch)
treece5c2a3f11da0c7296d8901a83641427256cd26c
parentb186d0084c9f46042f44ed773f7552c3f35e6e91 (diff)
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Added test_print.py. I want to have a test suite when the print function is backported to 2.6 as a future import.
-rw-r--r--Lib/test/test_print.py102
1 files changed, 102 insertions, 0 deletions
diff --git a/Lib/test/test_print.py b/Lib/test/test_print.py
new file mode 100644
index 0000000..66a5c6d
--- /dev/null
+++ b/Lib/test/test_print.py
@@ -0,0 +1,102 @@
+"""Test correct operation of the print function.
+"""
+
+import unittest
+from test import test_support
+
+import sys
+import io
+from contextlib import contextmanager
+
+NotDefined = object()
+
+# A dispatch table all 8 combinations of providing
+# sep, end, and file
+# I use this machinery so that I'm not just passing default
+# values to print, I'm eiher passing or not passing in the
+# arguments
+dispatch = {
+ (False, False, False):
+ lambda args, sep, end, file: print(*args),
+ (False, False, True):
+ lambda args, sep, end, file: print(file=file, *args),
+ (False, True, False):
+ lambda args, sep, end, file: print(end=end, *args),
+ (False, True, True):
+ lambda args, sep, end, file: print(end=end, file=file, *args),
+ (True, False, False):
+ lambda args, sep, end, file: print(sep=sep, *args),
+ (True, False, True):
+ lambda args, sep, end, file: print(sep=sep, file=file, *args),
+ (True, True, False):
+ lambda args, sep, end, file: print(sep=sep, end=end, *args),
+ (True, True, True):
+ lambda args, sep, end, file: print(sep=sep, end=end, file=file, *args),
+ }
+
+@contextmanager
+def stdout_redirected(new_stdout):
+ save_stdout = sys.stdout
+ sys.stdout = new_stdout
+ try:
+ yield None
+ finally:
+ sys.stdout = save_stdout
+
+# Class used to test __str__ and print
+class ClassWith__str__:
+ def __init__(self, x):
+ self.x = x
+ def __str__(self):
+ return self.x
+
+class TestPrint(unittest.TestCase):
+ def check(self, expected, args, *,
+ sep=NotDefined, end=NotDefined, file=NotDefined):
+ # Capture sys.stdout in a StringIO. Call print with args,
+ # and with sep, end, and file, if they're defined. Result
+ # must match expected.
+
+ # Look up the actual function to call, based on if sep, end, and file
+ # are defined
+ fn = dispatch[(sep is not NotDefined,
+ end is not NotDefined,
+ file is not NotDefined)]
+
+ t = io.StringIO()
+ with stdout_redirected(t):
+ fn(args, sep, end, file)
+
+ self.assertEqual(t.getvalue(), expected)
+
+ def test_print(self):
+ def x(expected, args, *, sep=NotDefined, end=NotDefined):
+ # Run the test 2 ways: not using file, and using
+ # file directed to a StringIO
+
+ self.check(expected, args, sep=sep, end=end)
+
+ # When writing to a file, stdout is expected to be empty
+ o = io.StringIO()
+ self.check('', args, sep=sep, end=end, file=o)
+
+ # And o will contain the expected output
+ self.assertEqual(o.getvalue(), expected)
+
+ x('\n', ())
+ x('a\n', ('a',))
+ x('None\n', (None,))
+ x('1 2\n', (1, 2))
+ x('1*2\n', (1, 2), sep='*')
+ x('1 s', (1, 's'), end='')
+ x('a\nb\n', ('a', 'b'), sep='\n')
+ x('1.01', (1.0, 1), sep='', end='')
+ x('1*a*1.3+', (1, 'a', 1.3), sep='*', end='+')
+
+ x('*\n', (ClassWith__str__('*'),))
+
+def test_main():
+ test_support.run_unittest(TestPrint)
+
+if __name__ == "__main__":
+ test_main()