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library/select2/tests/utils/decorator-tests.js

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+module('Decorators');
+
+var Utils = require('select2/utils');
+
+test('overridden - method', function (assert) {
+  function BaseClass () {}
+
+  BaseClass.prototype.hello = function () {
+    return 'A';
+  };
+
+  function DecoratorClass () {}
+
+  DecoratorClass.prototype.hello = function () {
+    return 'B';
+  };
+
+  var DecoratedClass = Utils.Decorate(BaseClass, DecoratorClass);
+
+  var inst = new DecoratedClass();
+
+  assert.strictEqual(inst.hello(), 'B');
+});
+
+test('overridden - constructor', function (assert) {
+  function BaseClass () {
+    this.inherited = true;
+  }
+
+  BaseClass.prototype.hello = function () {
+    return 'A';
+  };
+
+  function DecoratorClass (decorated) {
+    this.called = true;
+  }
+
+  DecoratorClass.prototype.other = function () {
+    return 'B';
+  };
+
+  var DecoratedClass = Utils.Decorate(BaseClass, DecoratorClass);
+
+  var inst = new DecoratedClass();
+
+  assert.ok(inst.called);
+  assert.ok(!inst.inherited);
+});
+
+test('not overridden - method', function (assert) {
+  function BaseClass () {}
+
+  BaseClass.prototype.hello = function () {
+    return 'A';
+  };
+
+  function DecoratorClass () {}
+
+  DecoratorClass.prototype.other = function () {
+    return 'B';
+  };
+
+  var DecoratedClass = Utils.Decorate(BaseClass, DecoratorClass);
+
+  var inst = new DecoratedClass();
+
+  assert.strictEqual(inst.hello(), 'A');
+});
+
+test('not overridden - constructor', function (assert) {
+  function BaseClass () {
+    this.called = true;
+  }
+
+  BaseClass.prototype.hello = function () {
+    return 'A';
+  };
+
+  function DecoratorClass () {}
+
+  DecoratorClass.prototype.other = function () {
+    return 'B';
+  };
+
+  var DecoratedClass = Utils.Decorate(BaseClass, DecoratorClass);
+
+  var inst = new DecoratedClass();
+
+  assert.ok(inst.called);
+});
+
+test('inherited - method', function (assert) {
+  function BaseClass () {}
+
+  BaseClass.prototype.hello = function () {
+    return 'A';
+  };
+
+  function DecoratorClass (decorated) {}
+
+  DecoratorClass.prototype.hello = function (decorated) {
+    return 'B' + decorated.call(this) + 'C';
+  };
+
+  var DecoratedClass = Utils.Decorate(BaseClass, DecoratorClass);
+
+  var inst = new DecoratedClass();
+
+  assert.strictEqual(inst.hello(), 'BAC');
+});
+
+test('inherited - constructor', function (assert) {
+  function BaseClass () {
+    this.inherited = true;
+  }
+
+  BaseClass.prototype.hello = function () {
+    return 'A';
+  };
+
+  function DecoratorClass (decorated) {
+    this.called = true;
+
+    decorated.call(this);
+  }
+
+  DecoratorClass.prototype.other = function () {
+    return 'B';
+  };
+
+  var DecoratedClass = Utils.Decorate(BaseClass, DecoratorClass);
+
+  var inst = new DecoratedClass();
+
+  assert.ok(inst.called);
+  assert.ok(inst.inherited);
+});
+
+test('inherited - three levels', function (assert) {
+  function BaseClass (testArgument) {
+    this.baseCalled = true;
+    this.baseTestArgument = testArgument;
+  }
+
+  BaseClass.prototype.test = function (a) {
+    return a + 'c';
+  };
+
+  function MiddleClass (decorated, testArgument) {
+    this.middleCalled = true;
+    this.middleTestArgument = testArgument;
+
+    decorated.call(this, testArgument);
+  }
+
+  MiddleClass.prototype.test = function (decorated, a) {
+    return decorated.call(this, a + 'b');
+  };
+
+  function DecoratorClass (decorated, testArgument) {
+    this.decoratorCalled = true;
+    this.decoratorTestArgument = testArgument;
+
+    decorated.call(this, testArgument);
+  }
+
+  DecoratorClass.prototype.test = function (decorated, a) {
+    return decorated.call(this, a + 'a');
+  };
+
+  var DecoratedClass = Utils.Decorate(
+    Utils.Decorate(BaseClass, MiddleClass),
+    DecoratorClass
+  );
+
+  var inst = new DecoratedClass('test');
+
+  assert.ok(inst.baseCalled, 'The base class contructor was called');
+  assert.ok(inst.middleCalled, 'The middle class constructor was called');
+  assert.ok(inst.decoratorCalled, 'The decorator constructor was called');
+
+  assert.strictEqual(inst.baseTestArgument, 'test');
+  assert.strictEqual(inst.middleTestArgument, 'test');
+  assert.strictEqual(inst.decoratorTestArgument, 'test');
+
+  var out = inst.test('test');
+
+  assert.strictEqual(out, 'testabc');
+});