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

Index: editor/util/plugins/com.google.dart.java2dart/resources/java_junit.dart
diff --git a/editor/util/plugins/com.google.dart.java2dart/resources/java_junit.dart b/editor/util/plugins/com.google.dart.java2dart/resources/java_junit.dart
index 8d284eb9ce8d78f74c8428638ba07f4da8997ff2..2ff97ad419d23291b59a342290f9bb1094344160 100644
--- a/editor/util/plugins/com.google.dart.java2dart/resources/java_junit.dart
+++ b/editor/util/plugins/com.google.dart.java2dart/resources/java_junit.dart
@@ -28,6 +28,9 @@ class JUnitTestCase {
   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));
   }
@@ -110,3 +113,19 @@ class _IsFalseWithMessage extends BaseMatcher {
     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");
+  }
+}