Initial steps for the incremental elements builder.

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

Index: pkg/analyzer/test/src/task/incremental_element_builder_test.dart
diff --git a/pkg/analyzer/test/src/task/incremental_element_builder_test.dart b/pkg/analyzer/test/src/task/incremental_element_builder_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b33f95c07058f001935a028baac78ff6d8b0bc22
--- /dev/null
+++ b/pkg/analyzer/test/src/task/incremental_element_builder_test.dart
@@ -0,0 +1,232 @@
+// 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.task.incremental_element_builder_test;
+
+import 'package:analyzer/src/generated/ast.dart';
+import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/task/incremental_element_builder.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../reflective_tests.dart';
+import '../context/abstract_context.dart';
+
+main() {
+  groupSep = ' | ';
+  runReflectiveTests(IncrementalCompilationUnitElementBuilderTest);
+}
+
+@reflectiveTest
+class IncrementalCompilationUnitElementBuilderTest extends AbstractContextTest {
+  Source source;
+  String oldCode;
+  CompilationUnit oldUnit;
+
+  String newCode;
+  CompilationUnit newUnit;
+
+  String getNodeText(AstNode node) {
+    return newCode.substring(node.offset, node.end);
+  }
+
+  test_directives_add() {
+    _buildOldUnit(r'''
+library test;
+import 'dart:math';
+''');
+    _buildNewUnit(r'''
+library test;
+import 'dart:async';
+import 'dart:math';
+''');
+    var oldDirectives = oldUnit.directives;
+    var newDirectives = newUnit.directives;
+    {
+      Directive newNode = newDirectives[0];
+      expect(newNode, same(oldDirectives[0]));
+      expect(getNodeText(newNode), "library test;");
+      LibraryElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf('test;'));
+    }
+    {
+      Directive newNode = newDirectives[1];
+      expect(getNodeText(newNode), "import 'dart:async';");
+      ImportElement element = newNode.element;
+      expect(element, isNull);
+    }
+    {
+      Directive newNode = newDirectives[2];
+      expect(newNode, same(oldDirectives[1]));
+      expect(getNodeText(newNode), "import 'dart:math';");
+      ImportElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf("import 'dart:math';"));
+    }
+  }
+
+  test_directives_remove() {
+    _buildOldUnit(r'''
+library test;
+import 'dart:async';
+import 'dart:math';
+''');
+    _buildNewUnit(r'''
+library test;
+import 'dart:math';
+''');
+    var oldDirectives = oldUnit.directives;
+    var newDirectives = newUnit.directives;
+    {
+      Directive newNode = newDirectives[0];
+      expect(newNode, same(oldDirectives[0]));
+      expect(getNodeText(newNode), "library test;");
+      LibraryElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf('test;'));
+    }
+    {
+      Directive newNode = newDirectives[1];
+      expect(newNode, same(oldDirectives[2]));
+      expect(getNodeText(newNode), "import 'dart:math';");
+      ImportElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf("import 'dart:math';"));
+    }
+  }
+
+  test_directives_reorder() {
+    _buildOldUnit(r'''
+library test;
+import  'dart:math' as m;
+import 'dart:async';
+''');
+    _buildNewUnit(r'''
+library test;
+import 'dart:async';
+import 'dart:math' as m;
+''');
+    var oldDirectives = oldUnit.directives;
+    var newDirectives = newUnit.directives;
+    {
+      Directive newNode = newDirectives[0];
+      expect(newNode, same(oldDirectives[0]));
+      expect(getNodeText(newNode), "library test;");
+      LibraryElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf('test;'));
+    }
+    {
+      Directive newNode = newDirectives[1];
+      expect(newNode, same(oldDirectives[2]));
+      expect(getNodeText(newNode), "import 'dart:async';");
+      ImportElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf("import 'dart:async';"));
+    }
+    {
+      Directive newNode = newDirectives[2];
+      expect(newNode, same(oldDirectives[1]));
+      expect(getNodeText(newNode), "import 'dart:math' as m;");
+      ImportElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf("import 'dart:math' as m;"));
+      expect(element.prefix.nameOffset, newCode.indexOf("m;"));
+    }
+  }
+
+  test_directives_sameOrder_insertSpaces() {
+    _buildOldUnit(r'''
+library test;
+import 'dart:async';
+import 'dart:math';
+''');
+    _buildNewUnit(r'''
+library test;
+
+import 'dart:async' ;
+import  'dart:math';
+''');
+    var oldDirectives = oldUnit.directives;
+    var newDirectives = newUnit.directives;
+    {
+      Directive newNode = newDirectives[0];
+      expect(newNode, same(oldDirectives[0]));
+      expect(getNodeText(newNode), "library test;");
+      LibraryElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf('test;'));
+    }
+    {
+      Directive newNode = newDirectives[1];
+      expect(newNode, same(oldDirectives[1]));
+      expect(getNodeText(newNode), "import 'dart:async' ;");
+      ImportElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf("import 'dart:async' ;"));
+    }
+    {
+      Directive newNode = newDirectives[2];
+      expect(newNode, same(oldDirectives[2]));
+      expect(getNodeText(newNode), "import  'dart:math';");
+      ImportElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf("import  'dart:math';"));
+    }
+  }
+
+  test_directives_sameOrder_removeSpaces() {
+    _buildOldUnit(r'''
+library test;
+
+import 'dart:async' ;
+import  'dart:math';
+''');
+    _buildNewUnit(r'''
+library test;
+import 'dart:async';
+import 'dart:math';
+''');
+    var oldDirectives = oldUnit.directives;
+    var newDirectives = newUnit.directives;
+    {
+      Directive newNode = newDirectives[0];
+      expect(newNode, same(oldDirectives[0]));
+      expect(getNodeText(newNode), "library test;");
+      LibraryElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf('test;'));
+    }
+    {
+      Directive newNode = newDirectives[1];
+      expect(newNode, same(oldDirectives[1]));
+      expect(getNodeText(newNode), "import 'dart:async';");
+      ImportElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf("import 'dart:async';"));
+    }
+    {
+      Directive newNode = newDirectives[2];
+      expect(newNode, same(oldDirectives[2]));
+      expect(getNodeText(newNode), "import 'dart:math';");
+      ImportElement element = newNode.element;
+      expect(element, isNotNull);
+      expect(element.nameOffset, newCode.indexOf("import 'dart:math';"));
+    }
+  }
+
+  void _buildNewUnit(String newCode) {
+    this.newCode = newCode;
+    context.setContents(source, newCode);
+    newUnit = context.parseCompilationUnit(source);
+    new IncrementalCompilationUnitElementBuilder(oldUnit, newUnit).build();
+  }
+
+  void _buildOldUnit(String oldCode) {
+    this.oldCode = oldCode;
+    source = newSource('/test.dart', oldCode);
+    oldUnit = context.resolveCompilationUnit2(source, source);
+  }
+}