Check PackageMapUriResolver constructor arguments.

pkg/analyzer/test/src/util/asserts_test.dart

+// Copyright (c) 2015, 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 test.src.util.asserts;
+
+import 'package:analyzer/src/util/asserts.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../reflective_tests.dart';
+
+
+main() {
+  groupSep = ' | ';
+  runReflectiveTests(AnalysisTaskTest);
+}
+
+
+@reflectiveTest
+class AnalysisTaskTest {
+  void test_notNull_notNull() {
+    notNull(this);
+  }
+
+  void test_notNull_null_hasDescription() {
+    notNull(this);
+    expect(
+        () => notNull(null, 'desc'),
+        throwsA(new isInstanceOf<ArgumentError>()));

[Brian Wilkerson, 2015/02/03 14:54:42]

I can't check, but is there a throwsArgumentError? (There are similar methods
for many of the built in exception classes.)

[scheglov, 2015/02/03 16:06:12]

Done.

+  }
+
+  void test_notNull_null_noDescription() {
+    notNull(this);
+    expect(() => notNull(null), throwsA(new isInstanceOf<ArgumentError>()));
+  }
+}