Support for line-level error suppression (#25685).

pkg/analyzer/test/generated/error_suppression_test.dart

+// Copyright (c) 2016, 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.
+
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/src/generated/java_engine_io.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/source_io.dart';
+
+import '../reflective_tests.dart';
+import '../utils.dart';
+import 'resolver_test.dart';
+import 'test_support.dart';
+
+main() {
+  initializeTestEnvironment();
+  runReflectiveTests(ErrorSuppressionTest);
+}
+
+@reflectiveTest
+class ErrorSuppressionTest extends EngineTestCase {

[Brian Wilkerson, 2016/02/16 21:39:05]

A lot of the support code in this class is already implemented in
ResolverTestCase. Might be better to change the superclass.

[pquitslund, 2016/02/16 21:51:42]

Funny.  I started that way and then convinced myself that I needed to do
something extra (in setUp() maybe?)  In any case, that's not true anymore (if it
ever was).  Updated accordingly.

+  InternalAnalysisContext analysisContext;
+
+  Source addNamedSource(String filePath, String contents) {
+    Source source = cacheSource(filePath, contents);
+    ChangeSet changeSet = new ChangeSet();
+    changeSet.addedSource(source);
+    analysisContext.applyChanges(changeSet);
+    return source;
+  }
+
+  Source addSource(String contents) => addNamedSource("/test.dart", contents);
+
+  void assertErrors(Source source,
+      [List<ErrorCode> expectedErrorCodes = ErrorCode.EMPTY_LIST]) {
+    GatheringErrorListener errorListener = new GatheringErrorListener();
+    for (AnalysisError error in analysisContext.computeErrors(source)) {
+      errorListener.onError(error);
+    }
+    errorListener.assertErrorsWithCodes(expectedErrorCodes);
+  }
+
+  Source cacheSource(String filePath, String contents) {
+    Source source = new FileBasedSource(FileUtilities2.createFile(filePath));
+    analysisContext.setContents(source, contents);
+    return source;
+  }
+
+  void computeLibrarySourceErrors(Source librarySource) {
+    analysisContext.computeErrors(librarySource);
+  }
+
+  void reset() {
+    analysisContext = AnalysisContextFactory.contextWithCore();
+  }
+
+  @override
+  void setUp() {
+    super.setUp();
+    reset();
+  }
+
+  void test_error_code_mismatch() {
+    Source source = addSource('''
+//# ignore: const_initialized_with_non_constant_value
+int x = '';
+const y = x; //CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [
+      StaticTypeWarningCode.INVALID_ASSIGNMENT,
+      CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+    ]);
+  }
+
+  void test_ignore_first() {
+    Source source = addSource('''
+//# ignore: invalid_assignment
+int x = '';
+// ... but no ignore here ...
+const y = x; //CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source,
+        [CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE]);
+  }
+
+  void test_ignore_second() {
+    Source source = addSource('''
+//INVALID_ASSIGNMENT
+int x = '';
+//# ignore: const_initialized_with_non_constant_value
+const y = x; //CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [StaticTypeWarningCode.INVALID_ASSIGNMENT]);
+  }
+
+  void test_invalid_error_code() {
+    Source source = addSource('''
+//# ignore: right_format_wrong_code
+int x = '';
+const y = x; //CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [
+      StaticTypeWarningCode.INVALID_ASSIGNMENT,
+      CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+    ]);
+  }
+
+  void test_missing_error_codes() {
+    Source source = addSource('''
+    int x = 3;
+//# ignore:
+const String y = x; //INVALID_ASSIGNMENT, CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [
+      StaticTypeWarningCode.INVALID_ASSIGNMENT,
+      CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+    ]);
+  }
+
+  void test_missing_metadata_prefix() {
+    Source source = addSource('''
+// ignore: invalid_assignment
+String y = 3; //INVALID_ASSIGNMENT
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [StaticTypeWarningCode.INVALID_ASSIGNMENT]);
+  }
+
+  void test_multiple_comments() {
+    Source source = addSource('''
+int x = ''; //This is the first comment...
+//# ignore: const_initialized_with_non_constant_value
+const y = x; //CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [StaticTypeWarningCode.INVALID_ASSIGNMENT]);
+  }
+
+  void test_multiple_ignores() {
+    Source source = addSource('''
+int x = 3;
+//# ignore: invalid_assignment, const_initialized_with_non_constant_value
+const String y = x; //INVALID_ASSIGNMENT, CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, []);
+  }
+
+  void test_multiple_ignores_whitespace_variant_1() {
+    Source source = addSource('''
+int x = 3;
+//#ignore:invalid_assignment,const_initialized_with_non_constant_value
+const String y = x; //INVALID_ASSIGNMENT, CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, []);
+  }
+
+  void test_multiple_ignores_whitespace_variant_2() {
+    Source source = addSource('''
+int x = 3;
+//#ignore: invalid_assignment,const_initialized_with_non_constant_value
+const String y = x; //INVALID_ASSIGNMENT, CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, []);
+  }
+
+  void test_multiple_ignores_whitespace_variant_3() {
+    Source source = addSource('''
+int x = 3;
+//# ignore: invalid_assignment,const_initialized_with_non_constant_value
+const String y = x; //INVALID_ASSIGNMENT, CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, []);
+  }
+
+  void test_no_ignores() {
+    Source source = addSource('''
+int x = '';  //INVALID_ASSIGNMENT
+const y = x; //CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [
+      StaticTypeWarningCode.INVALID_ASSIGNMENT,
+      CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+    ]);
+  }
+}