Add some more validation of things in expect that should not be used.

pkg/expect/lib/expect.dart

 // 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.
 
 /**
  * This library contains an Expect class with static methods that can be used
  * for simple unit-tests.
  */
 library expect;
 
@@ skipping 418 matching lines @@
   }
 
   /**
    * Calls the function [f] and verifies that it throws an exception.
    * The optional [check] function can provide additional validation
    * that the correct exception is being thrown.  For example, to check
    * the type of the exception you could write this:
    *
    *     Expect.throws(myThrowingFunction, (e) => e is MyException);
    */
-  static void throws(void f(),
-      [_CheckExceptionFn check = null, String reason = null]) {
+  static void throws(void f(), [_CheckExceptionFn check, String reason]) {
     String msg = reason == null ? "" : "($reason)";
     if (f is! _Nullary) {
       // Only throws from executing the function body should count as throwing.
       // The failure to even call `f` should throw outside the try/catch.
       _fail("Expect.throws$msg: Function f not callable with zero arguments");
     }
     try {
       f();
     } catch (e, s) {
       if (check != null) {
         if (!check(e)) {
           _fail("Expect.throws$msg: Unexpected '$e'\n$s");
         }
       }
       return;
     }
     _fail('Expect.throws$msg fails: Did not throw');
   }
 
+  static void throwsArgumentError(void f()) {
+    Expect.throws(f, (error) => error is ArgumentError, "ArgumentError");
+  }
+
+  static void throwsCastError(void f()) {
+    Expect.throws(f, (error) => error is CastError, "CastError");
+  }
+
+  static void throwsNoSuchMethodError(void f()) {
+    Expect.throws(
+        f, (error) => error is NoSuchMethodError, "NoSuchMethodError");
+  }
+
+  static void throwsRangeError(void f()) {
+    Expect.throws(f, (error) => error is RangeError, "RangeError");
+  }
+
+  static void throwsStateError(void f()) {
+    Expect.throws(f, (error) => error is StateError, "StateError");
+  }
+
+  static void throwsTypeError(void f()) {
+    Expect.throws(f, (error) => error is TypeError, "TypeError");
+  }
+
+  static void throwsUnsupportedError(void f()) {
+    Expect.throws(f, (error) => error is UnsupportedError, "UnsupportedError");
+  }
+
   static String _getMessage(String reason) =>
       (reason == null) ? "" : ", '$reason'";
 
   static void _fail(String message) {
     throw new ExpectException(message);
   }
 }
 
 bool _identical(a, b) => identical(a, b);
 
@@ skipping 28 matching lines @@
 
 /// Annotation class for testing of dart2js. Use this as metadata on method
 /// declarations to disable closed world assumptions on parameters, effectively
 /// assuming that the runtime arguments could be any value. Note that the
 /// constraints due to [TrustTypeAnnotations] still apply.
 class AssumeDynamic {
   const AssumeDynamic();
 }
 
 /// Is true iff type assertions are enabled.
+// TODO(rnystrom): Remove this once all tests are no longer using it.
 final bool typeAssertionsEnabled = (() {
   try {
     dynamic i = 42;
     String s = i;
   } on TypeError catch (e) {
     return true;
   }
   return false;
 })();
 
 /// Is true iff `assert` statements are enabled.
 final bool assertStatementsEnabled = (() {
   try {
     assert(false);
   } on AssertionError catch (e) {
     return true;
   }
   return false;
 })();
 
 /// Is true iff checked mode is enabled.
+// TODO(rnystrom): Remove this once all tests are no longer using it.
 final bool checkedModeEnabled =
     typeAssertionsEnabled && assertStatementsEnabled;