Migrate block 44.

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 442 matching lines @@
       }
       return;
     }
     _fail('Expect.throws$msg fails: Did not throw');
   }
 
   static void throwsArgumentError(void f()) {
     Expect.throws(f, (error) => error is ArgumentError, "ArgumentError");
   }
 
+  static void throwsAssertionError(void f()) {
+    Expect.throws(f, (error) => error is AssertionError, "AssertionError");
+  }
+
   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()) {
@@ skipping 78 matching lines @@
   } 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;