gh-93096: Remove `python -m base64 -t` (gh-94230)

Lib/base64.py

@@ -567,11 +567,10 @@ def decodebytes(s):
 def main():
     """Small main program"""
     import sys, getopt
-    usage = """usage: %s [-h|-d|-e|-u|-t] [file|-]
+    usage = f"""usage: {sys.argv[0]} [-h|-d|-e|-u|-t] [file|-]
         -h: print this help message and exit
         -d, -u: decode
-        -e: encode (default)
-        -t: encode and decode string 'Aladdin:open sesame'"""%sys.argv[0]
+        -e: encode (default)"""
     try:
         opts, args = getopt.getopt(sys.argv[1:], 'hdeut')
     except getopt.error as msg:
@@ -584,7 +583,6 @@ def main():
         if o == '-e': func = encode
         if o == '-d': func = decode
         if o == '-u': func = decode
-        if o == '-t': test(); return
         if o == '-h': print(usage); return
     if args and args[0] != '-':
         with open(args[0], 'rb') as f:
@@ -593,15 +591,5 @@ def main():
         func(sys.stdin.buffer, sys.stdout.buffer)
 
 
-def test():
-    s0 = b"Aladdin:open sesame"
-    print(repr(s0))
-    s1 = encodebytes(s0)
-    print(repr(s1))
-    s2 = decodebytes(s1)
-    print(repr(s2))
-    assert s0 == s2
-
-
 if __name__ == '__main__':
     main()

Lib/test/test_base64.py

@@ -31,6 +31,8 @@ class LegacyBase64TestCase(unittest.TestCase):
            b"YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNE"
            b"RUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0\nNT"
            b"Y3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==\n")
+        eq(base64.encodebytes(b"Aladdin:open sesame"),
+                              b"QWxhZGRpbjpvcGVuIHNlc2FtZQ==\n")
         # Non-bytes
         eq(base64.encodebytes(bytearray(b'abc')), b'YWJj\n')
         eq(base64.encodebytes(memoryview(b'abc')), b'YWJj\n')
@@ -50,6 +52,8 @@ class LegacyBase64TestCase(unittest.TestCase):
            b"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
            b"0123456789!@#0^&*();:<>,. []{}")
         eq(base64.decodebytes(b''), b'')
+        eq(base64.decodebytes(b"QWxhZGRpbjpvcGVuIHNlc2FtZQ==\n"),
+                              b"Aladdin:open sesame")
         # Non-bytes
         eq(base64.decodebytes(bytearray(b'YWJj\n')), b'abc')
         eq(base64.decodebytes(memoryview(b'YWJj\n')), b'abc')
@@ -762,14 +766,6 @@ class TestMain(unittest.TestCase):
     def get_output(self, *args):
         return script_helper.assert_python_ok('-m', 'base64', *args).out
 
-    def test_encode_decode(self):
-        output = self.get_output('-t')
-        self.assertSequenceEqual(output.splitlines(), (
-            b"b'Aladdin:open sesame'",
-            br"b'QWxhZGRpbjpvcGVuIHNlc2FtZQ==\n'",
-            b"b'Aladdin:open sesame'",
-        ))
-
     def test_encode_file(self):
         with open(os_helper.TESTFN, 'wb') as fp:
             fp.write(b'a\xffb\n')

Misc/NEWS.d/next/Library/2022-06-24-19-16-09.gh-issue-93096.r1_oIc.rst

@@ -0,0 +1,3 @@
+Removed undocumented ``-t`` argument of ``python -m base64``. Use
+``python -m unittest test.test_base64.LegacyBase64TestCase.test_encodebytes``
+instead.