Update test_codecencodings_tw from v3.14.3

Lib/test/test_codecencodings_tw.py

@@ -0,0 +1,22 @@
+#
+# test_codecencodings_tw.py
+#   Codec encoding tests for ROC encodings.
+#
+
+from test import multibytecodec_support
+import unittest
+
+class Test_Big5(multibytecodec_support.TestBase, unittest.TestCase):
+    encoding = 'big5'
+    tstring = multibytecodec_support.load_teststring('big5')
+    codectests = (
+        # invalid bytes
+        (b"abc\x80\x80\xc1\xc4", "strict",  None),
+        (b"abc\xc8", "strict",  None),
+        (b"abc\x80\x80\xc1\xc4", "replace", "abc\ufffd\ufffd\u8b10"),
+        (b"abc\x80\x80\xc1\xc4\xc8", "replace", "abc\ufffd\ufffd\u8b10\ufffd"),
+        (b"abc\x80\x80\xc1\xc4", "ignore",  "abc\u8b10"),
+    )
+
+if __name__ == "__main__":
+    unittest.main()