Use ConstantVerifier in VerifyUnitTask.

pkg/analyzer/test/src/task/dart_test.dart

Index: pkg/analyzer/test/src/task/dart_test.dart
diff --git a/pkg/analyzer/test/src/task/dart_test.dart b/pkg/analyzer/test/src/task/dart_test.dart
index f89b77194b0dbd1f0bda72b66199eaa8cc5700d8..7c02e2c9b12792856b10fd20e710031d944aaa00 100644
--- a/pkg/analyzer/test/src/task/dart_test.dart
+++ b/pkg/analyzer/test/src/task/dart_test.dart
@@ -2627,6 +2627,22 @@ class ScanDartTaskTest extends _AbstractDartTaskTest {
 
 @reflectiveTest
 class VerifyUnitTaskTest extends _AbstractDartTaskTest {
+  test_perform_constantError() {
+    Source source = newSource('/test.dart', '''
+main(int p) {
+  const v = p;
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    _computeResult(target, VERIFY_ERRORS);
+    expect(task, new isInstanceOf<VerifyUnitTask>());
+    // validate
+    _fillErrorListener(VERIFY_ERRORS);
+    errorListener.assertErrorsWithCodes(<ErrorCode>[
+      CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+    ]);
+  }
+
   test_perform_directiveError() {
     Source source = newSource('/test.dart', '''
 import 'no-such-file.dart';