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<!DOCTYPE html>
<html>
<!--
Copyright 2008 The Closure Library Authors. All Rights Reserved.
Use of this source code is governed by the Apache License, Version 2.0.
See the COPYING file for details.
-->
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Closure Unit Tests - goog.memoize</title>
<script src="../base.js"></script>
<script>
goog.require('goog.memoize');
goog.require('goog.testing.jsunit');
</script>
</head>
<body>
<script>
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);
}
</script>
</body>
</html>
|
