Migrated test block 219 to Dart 2.0.

tests/lib_2/mirrors/mirrors_test.dart

+// Copyright (c) 2011, 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 MirrorsTest;
+
+import 'dart:mirrors';
+
+import '../../light_unittest.dart';
+
+bool isDart2js = false; // TODO(ahe): Remove this field.
+
+var topLevelField;
+u(a, b, c) => {"a": a, "b": b, "c": c};
+_v(a, b) => a + b;
+
+class Class<T> {
+  Class() {
+    this.field = "default value";
+  }
+  Class.withInitialValue(this.field);
+  var field;
+
+  Class.generative(this.field);
+  Class.redirecting(y) : this.generative(y * 2);
+  factory Class.faktory(y) => new Class.withInitialValue(y * 3);
+  factory Class.redirectingFactory(y) = Class<T>.faktory;
+
+  m(a, b, c) => {"a": a, "b": b, "c": c};
+  _n(a, b) => a + b;
+  noSuchMethod(invocation) => "DNU";
+
+  static var staticField;
+  static s(a, b, c) => {"a": a, "b": b, "c": c};
+  static _t(a, b) => a + b;
+}
+
+typedef Typedef();
+
+testInvoke(mirrors) {
+  var instance = new Class();
+  var instMirror = reflect(instance);
+
+  expect(instMirror.invoke(#m, ['A', 'B', instance]).reflectee,
+      equals({"a": 'A', "b": 'B', "c": instance}));
+  expect(instMirror.invoke(#notDefined, []).reflectee, equals("DNU"));
+  expect(instMirror.invoke(#m, []).reflectee, equals("DNU")); // Wrong arity.
+
+  var classMirror = instMirror.type;
+  expect(classMirror.invoke(#s, ['A', 'B', instance]).reflectee,
+      equals({"a": 'A', "b": 'B', "c": instance}));
+  expect(() => classMirror.invoke(#notDefined, []).reflectee, throws);
+  expect(() => classMirror.invoke(#s, []).reflectee, throws); // Wrong arity.
+
+  var libMirror = classMirror.owner as LibraryMirror;
+  expect(libMirror.invoke(#u, ['A', 'B', instance]).reflectee,
+      equals({"a": 'A', "b": 'B', "c": instance}));
+  expect(() => libMirror.invoke(#notDefined, []).reflectee, throws);
+  expect(() => libMirror.invoke(#u, []).reflectee, throws); // Wrong arity.
+}
+
+/// In dart2js, lists, numbers, and other objects are treated special
+/// and their methods are invoked through a techique called interceptors.
+testIntercepted(mirrors) {
+  {
+    var instance = 1;
+    var instMirror = reflect(instance);
+
+    expect(instMirror.invoke(#toString, []).reflectee, equals('1'));
+  }
+
+  var instance = [];
+  var instMirror = reflect(instance);
+  instMirror.setField(#length, 44);
+  var resultMirror = instMirror.getField(#length);
+  expect(resultMirror.reflectee, equals(44));
+  expect(instance.length, equals(44));
+
+  expect(
+      instMirror.invoke(#toString, []).reflectee,
+      equals('[null, null, null, null, null, null, null, null, null, null,'
+          ' null, null, null, null, null, null, null, null, null, null,'
+          ' null, null, null, null, null, null, null, null, null, null,'
+          ' null, null, null, null, null, null, null, null, null, null,'
+          ' null, null, null, null]'));
+}

[Bob Nystrom, 2017/08/23 22:22:07]

Do we still need this if we're not supporting mirrors in dart2js any more?

+
+testFieldAccess(mirrors) {
+  var instance = new Class();
+
+  var libMirror = mirrors.findLibrary(#MirrorsTest);
+  var classMirror = libMirror.declarations[#Class];
+  var instMirror = reflect(instance);
+  var fieldMirror = classMirror.declarations[#field];
+  var future;
+
+  expect(fieldMirror is VariableMirror, isTrue);
+  expect(fieldMirror.type, equals(mirrors.dynamicType));
+
+  libMirror.setField(#topLevelField, [91]);
+  expect(libMirror.getField(#topLevelField).reflectee, equals([91]));
+  expect(topLevelField, equals([91]));
+}
+
+testClosureMirrors(mirrors) {
+  // TODO(ahe): Test optional parameters (named or not).
+  var closure = (x, y, z) {
+    return x + y + z;
+  };
+
+  var mirror = reflect(closure) as ClosureMirror;
+
+  var funcMirror = (mirror.function) as MethodMirror;
+  expect(funcMirror.parameters.length, equals(3));
+
+  expect(mirror.apply([7, 8, 9]).reflectee, equals(24));
+}
+
+testInvokeConstructor(mirrors) {
+  var classMirror = reflectClass(Class);
+
+  var instanceMirror = classMirror.newInstance(const Symbol(''), []);
+  expect(instanceMirror.reflectee is Class, equals(true));
+  expect(instanceMirror.reflectee.field, equals("default value"));
+
+  instanceMirror = classMirror.newInstance(#withInitialValue, [45]);
+  expect(instanceMirror.reflectee is Class, equals(true));
+  expect(instanceMirror.reflectee.field, equals(45));
+
+  instanceMirror = classMirror.newInstance(#generative, [7]);
+  expect(instanceMirror.reflectee is Class, equals(true));
+  expect(instanceMirror.reflectee.field, equals(7));
+
+  instanceMirror = classMirror.newInstance(#redirecting, [8]);
+  expect(instanceMirror.reflectee is Class, equals(true));
+  expect(instanceMirror.reflectee.field, equals(16));
+
+  instanceMirror = classMirror.newInstance(#faktory, [9]);
+  expect(instanceMirror.reflectee is Class, equals(true));
+  expect(instanceMirror.reflectee.field, equals(27));
+
+  instanceMirror = classMirror.newInstance(#redirectingFactory, [10]);
+  expect(instanceMirror.reflectee is Class, equals(true));
+  expect(instanceMirror.reflectee.field, equals(30));
+}
+
+testReflectClass(mirrors) {
+  var classMirror = reflectClass(Class);
+  expect(classMirror is ClassMirror, equals(true));
+  var symbolClassMirror = reflectClass(Symbol);
+  var symbolMirror =
+      symbolClassMirror.newInstance(const Symbol(''), ['withInitialValue']);
+  var objectMirror = classMirror.newInstance(symbolMirror.reflectee, [1234]);
+  expect(objectMirror.reflectee is Class, equals(true));
+  expect(objectMirror.reflectee.field, equals(1234));
+}
+
+testNames(mirrors) {
+  var libMirror = mirrors.findLibrary(#MirrorsTest);
+  var classMirror = libMirror.declarations[#Class];
+  var typedefMirror = libMirror.declarations[#Typedef];
+  var methodMirror = libMirror.declarations[#testNames];
+  var variableMirror = classMirror.declarations[#field];
+
+  expect(libMirror.simpleName, equals(#MirrorsTest));
+  expect(libMirror.qualifiedName, equals(#MirrorsTest));
+
+  expect(classMirror.simpleName, equals(#Class));
+  expect(classMirror.qualifiedName, equals(#MirrorsTest.Class));
+
+  TypeVariableMirror typeVariable = classMirror.typeVariables.single;
+  expect(typeVariable.simpleName, equals(#T));
+  expect(
+      typeVariable.qualifiedName, equals(const Symbol('MirrorsTest.Class.T')));
+
+  if (!isDart2js) {
+    // TODO(ahe): Implement this in dart2js.
+    expect(typedefMirror.simpleName, equals(#Typedef));
+    expect(typedefMirror.qualifiedName,
+        equals(const Symbol('MirrorsTest.Typedef')));
+
+    var typedefMirrorDeNovo = reflectType(Typedef);
+    expect(typedefMirrorDeNovo.simpleName, equals(#Typedef));
+    expect(typedefMirrorDeNovo.qualifiedName,
+        equals(const Symbol('MirrorsTest.Typedef')));
+  }
+
+  expect(methodMirror.simpleName, equals(#testNames));
+  expect(methodMirror.qualifiedName,
+      equals(const Symbol('MirrorsTest.testNames')));
+
+  expect(variableMirror.simpleName, equals(#field));
+  expect(variableMirror.qualifiedName,
+      equals(const Symbol('MirrorsTest.Class.field')));
+}
+
+testLibraryUri(var value, bool check(Uri)) {
+  var valueMirror = reflect(value);
+  ClassMirror valueClass = valueMirror.type;
+  LibraryMirror valueLibrary = valueClass.owner;
+  Uri uri = valueLibrary.uri;
+  if (uri.scheme != "https" ||
+      uri.host != "dartlang.org" ||
+      uri.path != "/dart2js-stripped-uri") {
+    expect(check(uri), isTrue);
+  }
+}
+
+main() {
+  var mirrors = currentMirrorSystem();
+  test("Test reflective method invocation", () {
+    testInvoke(mirrors);
+  });
+  test('Test intercepted objects', () {
+    testIntercepted(mirrors);
+  });
+  test("Test field access", () {
+    testFieldAccess(mirrors);
+  });
+  test("Test closure mirrors", () {
+    testClosureMirrors(mirrors);
+  });
+  test("Test invoke constructor", () {
+    testInvokeConstructor(mirrors);
+  });
+  test("Test current library uri", () {
+    testLibraryUri(
+        new Class(),
+        // TODO(floitsch): change this to "/mirrors_test.dart" when
+        // dart2js_mirrors_test.dart has been removed.
+        (Uri uri) => uri.path.endsWith('mirrors_test.dart'));
+  });
+  test("Test dart library uri", () {
+    testLibraryUri("test", (Uri uri) {
+      if (uri == Uri.parse('dart:core')) return true;
+      // TODO(floitsch): do we want to fake the interceptors to
+      // be in dart:core?
+      return (uri == Uri.parse('dart:_interceptors'));
+    });
+  });
+  test("Test simple and qualifiedName", () {
+    testNames(mirrors);
+  });
+  test("Test reflect type", () {
+    testReflectClass(mirrors);
+  });
+}