| // Copyright 2008 The Closure Library Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS-IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| goog.provide('goog.memoizeTest'); |
| goog.setTestOnly('goog.memoizeTest'); |
| |
| goog.require('goog.memoize'); |
| goog.require('goog.testing.jsunit'); |
| |
| function testNoArgs() { |
| var called = 0; |
| var f = goog.memoize(function() { |
| called++; |
| return 10; |
| }); |
| |
| assertEquals('f() 1st call', 10, f()); |
| assertEquals('f() 2nd call', 10, f()); |
| assertEquals('f() 3rd call', 10, f.call()); |
| assertEquals('f() called once', 1, called); |
| } |
| |
| function testOneOptionalArgSimple() { |
| var called = 0; |
| var f = goog.memoize(function(opt_x) { |
| called++; |
| return arguments.length == 0 ? 'no args' : opt_x; |
| }); |
| |
| assertEquals('f() 1st call', 'no args', f()); |
| assertEquals('f() 2nd call', 'no args', f()); |
| assertEquals('f(0) 1st call', 0, f(0)); |
| assertEquals('f(0) 2nd call', 0, f(0)); |
| assertEquals('f("") 1st call', '', f('')); |
| assertEquals('f("") 2nd call', '', f('')); |
| assertEquals('f("0") 1st call', '0', f('0')); |
| assertEquals('f("0") 1st call', '0', f('0')); |
| assertEquals('f(null) 1st call', null, f(null)); |
| assertEquals('f(null) 2nd call', null, f(null)); |
| assertEquals('f(undefined) 1st call', undefined, f(undefined)); |
| assertEquals('f(undefined) 2nd call', undefined, f(undefined)); |
| |
| assertEquals('f(opt_x) called 6 times', 6, called); |
| } |
| |
| function testProtoFunctions() { |
| var fcalled = 0; |
| var gcalled = 0; |
| var Class = function(x) { |
| this.x = x; |
| this.f = goog.memoize(function(y) { |
| fcalled++; |
| return this.x + y; |
| }); |
| }; |
| Class.prototype.g = goog.memoize(function(z) { |
| gcalled++; |
| return this.x - z; |
| }); |
| |
| var obj1 = new Class(10); |
| var obj2 = new Class(20); |
| |
| assertEquals('10+1', 11, obj1.f(1)); |
| assertEquals('10+2', 12, obj1.f(2)); |
| assertEquals('10+2 again', 12, obj1.f(2)); |
| assertEquals('f called twice', 2, fcalled); |
| |
| assertEquals('10-1', 9, obj1.g(1)); |
| assertEquals('10-2', 8, obj1.g(2)); |
| assertEquals('10-2 again', 8, obj1.g(2)); |
| assertEquals('g called twice', 2, gcalled); |
| |
| assertEquals('20+1', 21, obj2.f(1)); |
| assertEquals('20+2', 22, obj2.f(2)); |
| assertEquals('20+2 again', 22, obj2.f(2)); |
| assertEquals('f called 4 times', 4, fcalled); |
| |
| assertEquals('20-1', 19, obj2.g(1)); |
| assertEquals('20-2', 18, obj2.g(2)); |
| assertEquals('20-2 again', 18, obj2.g(2)); |
| assertEquals('g called 4 times', 4, gcalled); |
| } |
| |
| function testCustomSerializer() { |
| var called = 0; |
| var serializer = function(this_context, args) { |
| return String(args[0].getTime()); |
| }; |
| var getYear = goog.memoize(function(date) { |
| called++; |
| return date.getFullYear(); |
| }, serializer); |
| |
| assertEquals('getYear(2008, 0, 1), 1st', 2008, getYear(new Date(2008, 0, 1))); |
| assertEquals('getYear(2008, 0, 1), 2nd', 2008, getYear(new Date(2008, 0, 1))); |
| assertEquals('getYear called once', 1, called); |
| |
| assertEquals('getYear(2007, 0, 1)', 2007, getYear(new Date(2007, 0, 1))); |
| assertEquals('getYear called twice', 2, called); |
| } |
| |
| function testClearCache() { |
| var computed = 0; |
| var identity = goog.memoize(function(x) { |
| computed++; |
| return x; |
| }); |
| assertEquals('identity(1)==1', 1, identity(1)); |
| assertEquals('identity(1)==1', 1, identity(1)); |
| assertEquals('identity(1)==1', 1, identity(1)); |
| assertEquals('Expected memozation', 1, computed); |
| |
| goog.memoize.clearCache(goog.global); |
| assertEquals('identity(1)==1', 1, identity(1)); |
| assertEquals('identity(1)==1', 1, identity(1)); |
| assertEquals('Expected cleared memoization cache', 2, computed); |
| } |
| |
| function testDisableMemoize() { |
| var computed = 0; |
| var identity = goog.memoize(function(x) { |
| computed++; |
| return x; |
| }); |
| |
| assertEquals('return value on first call', 1, identity(1)); |
| assertEquals('return value on second call (memoized)', 1, identity(1)); |
| assertEquals('computed once', 1, computed); |
| |
| goog.memoize.ENABLE_MEMOIZE = false; |
| |
| try { |
| assertEquals('return value after disabled memoization', 1, identity(1)); |
| assertEquals('computed again', 2, computed); |
| } finally { |
| goog.memoize.ENABLE_MEMOIZE = true; |
| } |
| |
| assertEquals('return value after reenabled memoization', 1, identity(1)); |
| assertEquals('not computed again', 2, computed); |
| } |