Simplify base64 streaming decoder, drop decoding check.

test/base64_test.dart

Index: test/base64_test.dart
diff --git a/test/base64_test.dart b/test/base64_test.dart
index 76b586e23d8cbdb00ffb635be572b562ac9cf411..1f080fa8ea7a110e73b313f3b9586121443c1a8f 100644
--- a/test/base64_test.dart
+++ b/test/base64_test.dart
@@ -17,8 +17,6 @@ void main() {
   test('decoder for malformed input', _testDecoderForMalformedInput);
   test('encode decode lists', _testEncodeDecodeLists);
   test('url safe encode-decode', _testUrlSafeEncodeDecode);
-  test('consistent safe/unsafe character decoding',
-       _testConsistentSafeUnsafeDecode);
   test('percent-encoded padding character encode-decode',
        _testPaddingCharacter);
   test('streaming encoder', _testStreamingEncoder);
@@ -29,8 +27,6 @@ void main() {
        _testStreamingEncoderForDecompositions);
   test('streaming decoder for different decompositions of a string',
        _testStreamingDecoderForDecompositions);
-  test('consistent safe/unsafe character streaming decoding',
-       _testConsistentSafeUnsafeStreamDecode);
   test('streaming for encoded padding character',
        _testStreamingForEncodedPadding);
   test('old api', _testOldApi);
@@ -237,19 +233,6 @@ Future _testUrlSafeStreaming() async {
   expect(streamedResult, encUrlSafe);
 }
 
-void _testConsistentSafeUnsafeDecode() {
-  expect(() {
-    BASE64.decode(_INCONSISTENT_SAFE_RESULT);
-  }, throwsFormatException);
-}
-
-Future _testConsistentSafeUnsafeStreamDecode() {
-  expect(new Stream.fromIterable(_INCONSISTENT_SAFE_STREAMING_RESULT)
-                   .transform(BASE64.decoder)
-                   .toList(),
-         throwsFormatException);
-}
-
 Future _testStreamingForEncodedPadding() async {
   List<String> withEncodedPadding = ['AA%', '3D', '%', '3', 'DEFGZ'];
   List<int> decoded = BASE64.decode('AA==EFGZ');