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editor/util/plugins/com.google.dart.java2dart/resources/java_junit.dart

 library java.junit;
 
 import 'package:unittest/unittest.dart' hide fail;
 import 'package:unittest/unittest.dart' as _ut show fail;
 
 
 class JUnitTestCase {
   void setUp() {}
   void tearDown() {}
   static void fail(String msg) {
@@ skipping 10 matching lines @@
   }
   static void assertFalseMsg(String msg, bool x) {
     expect(x, isFalseMsg(msg));
   }
   static void assertNull(x) {
     expect(x, isNull);
   }
   static void assertNotNull(x) {
     expect(x, isNotNull);
   }
+  static void assertNotNullMsg(String msg, x) {
+    expect(x, isNotNullMsg(msg));
+  }
   static void assertEquals(expected, actual) {
     expect(actual, equals(expected));
   }
   static void assertEqualsMsg(String msg, expected, actual) {
     expect(actual, equalsMsg(msg, expected));
   }
   static void assertSame(expected, actual) {
     expect(actual, same(expected));
   }
 }
@@ skipping 62 matching lines @@
     return item == false;
   }
   Description describe(Description mismatchDescription) {
     return mismatchDescription.replace(msg);
   }
   Description describeMismatch(item, Description mismatchDescription,
                                MatchState matchState, bool verbose) {
     return mismatchDescription.replace(msg).add(" $item is not false");
   }
 }
+
+Matcher isNotNullMsg(String msg) => new _IsNotNullWithMessage(msg);
+class _IsNotNullWithMessage extends BaseMatcher {
+  final String msg;
+  const _IsNotNullWithMessage(this.msg);
+  bool matches(item, MatchState matchState) {
+    return item != null;
+  }
+  Description describe(Description mismatchDescription) {
+    return mismatchDescription.replace(msg);
+  }
+  Description describeMismatch(item, Description mismatchDescription,
+                               MatchState matchState, bool verbose) {
+    return mismatchDescription.replace(msg).add(" $item is null");
+  }
+}