Add support for creating source ranges

pkg/analyzer_plugin/test/utilities/range_factory_test.dart

Index: pkg/analyzer_plugin/test/utilities/range_factory_test.dart
diff --git a/pkg/analyzer_plugin/test/utilities/range_factory_test.dart b/pkg/analyzer_plugin/test/utilities/range_factory_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..df120d832238e15bd01c2595d19a1b90c46b855c
--- /dev/null
+++ b/pkg/analyzer_plugin/test/utilities/range_factory_test.dart
@@ -0,0 +1,108 @@
+// Copyright (c) 2017, 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/dart/ast/ast.dart';
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/error/error.dart';
+import 'package:analyzer/src/generated/parser.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer_plugin/utilities/range_factory.dart';
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import '../support/abstract_single_unit.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(SourceRangesTest);
+  });
+}
+
+@reflectiveTest
+class SourceRangesTest extends AbstractSingleUnitTest {
+  test_elementName() async {
+    await resolveTestUnit('class ABC {}');
+    Element element = findElement('ABC');
+    expect(range.elementName(element), new SourceRange(6, 3));
+  }
+
+  test_endEnd() async {
+    await resolveTestUnit('main() {}');
+    FunctionDeclaration mainFunction = testUnit.declarations[0];
+    SimpleIdentifier mainName = mainFunction.name;
+    FunctionBody mainBody = mainFunction.functionExpression.body;
+    expect(range.endEnd(mainName, mainBody), new SourceRange(4, 5));
+  }
+
+  test_endLength() async {
+    await resolveTestUnit('main() {}');
+    FunctionDeclaration mainFunction = testUnit.declarations[0];
+    SimpleIdentifier mainName = mainFunction.name;
+    expect(range.endLength(mainName, 3), new SourceRange(4, 3));
+  }
+
+  test_endStart() async {
+    await resolveTestUnit('main() {}');
+    FunctionDeclaration mainFunction = testUnit.declarations[0];
+    SimpleIdentifier mainName = mainFunction.name;
+    FunctionBody mainBody = mainFunction.functionExpression.body;
+    expect(range.endStart(mainName, mainBody), new SourceRange(4, 3));
+  }
+
+  test_error() {
+    AnalysisError error =
+        new AnalysisError(null, 10, 5, ParserErrorCode.CONST_CLASS, []);
+    expect(range.error(error), new SourceRange(10, 5));
+  }
+
+  test_node() async {
+    await resolveTestUnit('main() {}');
+    FunctionDeclaration mainFunction = testUnit.declarations[0];
+    SimpleIdentifier mainName = mainFunction.name;
+    expect(range.node(mainName), new SourceRange(0, 4));
+  }
+
+  test_nodes() async {
+    await resolveTestUnit(' main() {}');
+    FunctionDeclaration mainFunction = testUnit.declarations[0];
+    SimpleIdentifier mainName = mainFunction.name;
+    FunctionBody mainBody = mainFunction.functionExpression.body;
+    expect(range.nodes([mainName, mainBody]), new SourceRange(1, 9));
+  }
+
+  test_nodes_empty() async {
+    await resolveTestUnit('main() {}');
+    expect(range.nodes([]), new SourceRange(0, 0));
+  }
+
+  test_startEnd_nodeNode() async {
+    await resolveTestUnit(' main() {}');
+    FunctionDeclaration mainFunction = testUnit.declarations[0];
+    SimpleIdentifier mainName = mainFunction.name;
+    FunctionBody mainBody = mainFunction.functionExpression.body;
+    expect(range.startEnd(mainName, mainBody), new SourceRange(1, 9));
+  }
+
+  test_startLength_node() async {
+    await resolveTestUnit(' main() {}');
+    FunctionDeclaration mainFunction = testUnit.declarations[0];
+    SimpleIdentifier mainName = mainFunction.name;
+    expect(range.startLength(mainName, 10), new SourceRange(1, 10));
+  }
+
+  test_startStart_nodeNode() async {
+    await resolveTestUnit('main() {}');
+    FunctionDeclaration mainFunction = testUnit.declarations[0];
+    SimpleIdentifier mainName = mainFunction.name;
+    FunctionBody mainBody = mainFunction.functionExpression.body;
+    expect(range.startStart(mainName, mainBody), new SourceRange(0, 7));
+  }
+
+  test_token() async {
+    await resolveTestUnit(' main() {}');
+    FunctionDeclaration mainFunction = testUnit.declarations[0];
+    SimpleIdentifier mainName = mainFunction.name;
+    expect(range.token(mainName.beginToken), new SourceRange(1, 4));
+  }
+}