Re-apply "Remove unittest and matcher from the repo."

pkg/matcher/lib/src/error_matchers.dart

Index: pkg/matcher/lib/src/error_matchers.dart
diff --git a/pkg/matcher/lib/src/error_matchers.dart b/pkg/matcher/lib/src/error_matchers.dart
deleted file mode 100644
index fd0445c3d5d1b708a9ecc481f2d6079da9349e2a..0000000000000000000000000000000000000000
--- a/pkg/matcher/lib/src/error_matchers.dart
+++ /dev/null
@@ -1,102 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library matcher.error_matchers;
-
-import 'core_matchers.dart';
-import 'interfaces.dart';
-
-/// A matcher for ArgumentErrors.
-const Matcher isArgumentError = const _ArgumentError();
-
-class _ArgumentError extends TypeMatcher {
-  const _ArgumentError(): super("ArgumentError");
-  bool matches(item, Map matchState) => item is ArgumentError;
-}
-
-/// A matcher for ConcurrentModificationError.
-const Matcher isConcurrentModificationError =
-    const _ConcurrentModificationError();
-
-class _ConcurrentModificationError extends TypeMatcher {
-  const _ConcurrentModificationError(): super("ConcurrentModificationError");
-  bool matches(item, Map matchState) => item is ConcurrentModificationError;
-}
-
-/// A matcher for CyclicInitializationError.
-const Matcher isCyclicInitializationError = const _CyclicInitializationError();
-
-class _CyclicInitializationError extends TypeMatcher {
-  const _CyclicInitializationError(): super("CyclicInitializationError");
-  bool matches(item, Map matchState) => item is CyclicInitializationError;
-}
-
-/// A matcher for Exceptions.
-const Matcher isException = const _Exception();
-
-class _Exception extends TypeMatcher {
-  const _Exception(): super("Exception");
-  bool matches(item, Map matchState) => item is Exception;
-}
-
-class _FallThroughError extends TypeMatcher {
-  const _FallThroughError(): super("FallThroughError");
-  bool matches(item, Map matchState) => item is FallThroughError;
-}
-
-/// A matcher for FormatExceptions.
-const Matcher isFormatException = const _FormatException();
-
-class _FormatException extends TypeMatcher {
-  const _FormatException(): super("FormatException");
-  bool matches(item, Map matchState) => item is FormatException;
-}
-
-/// A matcher for NoSuchMethodErrors.
-const Matcher isNoSuchMethodError = const _NoSuchMethodError();
-
-class _NoSuchMethodError extends TypeMatcher {
-  const _NoSuchMethodError(): super("NoSuchMethodError");
-  bool matches(item, Map matchState) => item is NoSuchMethodError;
-}
-
-/// A matcher for NullThrownError.
-const Matcher isNullThrownError = const _NullThrownError();
-
-class _NullThrownError extends TypeMatcher {
-  const _NullThrownError(): super("NullThrownError");
-  bool matches(item, Map matchState) => item is NullThrownError;
-}
-
-/// A matcher for RangeErrors.
-const Matcher isRangeError = const _RangeError();
-
-class _RangeError extends TypeMatcher {
-  const _RangeError(): super("RangeError");
-  bool matches(item, Map matchState) => item is RangeError;
-}
-
-/// A matcher for StateErrors.
-const Matcher isStateError = const _StateError();
-
-class _StateError extends TypeMatcher {
-  const _StateError(): super("StateError");
-  bool matches(item, Map matchState) => item is StateError;
-}
-
-/// A matcher for UnimplementedErrors.
-const Matcher isUnimplementedError = const _UnimplementedError();
-
-class _UnimplementedError extends TypeMatcher {
-  const _UnimplementedError(): super("UnimplementedError");
-  bool matches(item, Map matchState) => item is UnimplementedError;
-}
-
-/// A matcher for UnsupportedError.
-const Matcher isUnsupportedError = const _UnsupportedError();
-
-class _UnsupportedError extends TypeMatcher {
-  const _UnsupportedError(): super("UnsupportedError");
-  bool matches(item, Map matchState) => item is UnsupportedError;
-}