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Created September 17, 2014 17:12
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[add your bin description] // source http://jsbin.com/ricabu/1
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta name="description" content="[add your bin description]" />
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<script id="jsbin-javascript">
/********************************************************
T E S T I N G : M E S S Y V S C L E A N
********************************************************/
//////////////////////// MESSY //////////////////////////
// If we want to test a messy function like daysThisMonth
// we have to know how it is implemented and ovveride or
// "mock" the responses of its environment.
var realDate = Date;
var Date = function() {
if(arguments.length === 0) {
return new realDate(1929, 10-1, 24);
} else {
return new realDate(
arguments[0], arguments[1], arguments[2]);
}
};
assertEqual( daysThisMonth(), 31 );
Date = realDate;
//////////////////////// CLEAN //////////////////////////
// Gross, isn't it? We want to test a function's
// interface, not its implementation. It is much easier
// to test daysInMonth(). Pick a month and write the
// test. (Thirty days hath September, April, June and
// November...)
assertEqual( daysInMonth(1929, 10), 31 );
console.log("All tests pass.");
/********************************************************
B A C K G R O U N D C O D E
********************************************************/
function daysThisMonth() {
var date = new Date(),
y = date.getFullYear(),
m = date.getMonth(),
start = new Date(y, m, 1),
end = new Date(y, m + 1, 1);
return (end - start) / (1000 * 60 * 60 * 24);
}
function daysInMonth(y, m) {
var start = new Date(y, m - 1, 1),
end = new Date(y, m, 1);
return (end - start) / (1000 * 60 * 60 * 24);
}
function assertEqual(x,y, msg) {
if(x != y) throw("expected "+x+" to equal "+y);
}
</script>
<script id="jsbin-source-javascript" type="text/javascript">/********************************************************
T E S T I N G : M E S S Y V S C L E A N
********************************************************/
//////////////////////// MESSY //////////////////////////
// If we want to test a messy function like daysThisMonth
// we have to know how it is implemented and ovveride or
// "mock" the responses of its environment.
var realDate = Date;
var Date = function() {
if(arguments.length === 0) {
return new realDate(1929, 10-1, 24);
} else {
return new realDate(
arguments[0], arguments[1], arguments[2]);
}
};
assertEqual( daysThisMonth(), 31 );
Date = realDate;
//////////////////////// CLEAN //////////////////////////
// Gross, isn't it? We want to test a function's
// interface, not its implementation. It is much easier
// to test daysInMonth(). Pick a month and write the
// test. (Thirty days hath September, April, June and
// November...)
assertEqual( daysInMonth(1929, 10), 31 );
console.log("All tests pass.");
/********************************************************
B A C K G R O U N D C O D E
********************************************************/
function daysThisMonth() {
var date = new Date(),
y = date.getFullYear(),
m = date.getMonth(),
start = new Date(y, m, 1),
end = new Date(y, m + 1, 1);
return (end - start) / (1000 * 60 * 60 * 24);
}
function daysInMonth(y, m) {
var start = new Date(y, m - 1, 1),
end = new Date(y, m, 1);
return (end - start) / (1000 * 60 * 60 * 24);
}
function assertEqual(x,y, msg) {
if(x != y) throw("expected "+x+" to equal "+y);
}</script></body>
</html>
Raw
jsbin.ricabu.js
/********************************************************
T E S T I N G : M E S S Y V S C L E A N
********************************************************/
//////////////////////// MESSY //////////////////////////
// If we want to test a messy function like daysThisMonth
// we have to know how it is implemented and ovveride or
// "mock" the responses of its environment.
var realDate = Date;
var Date = function() {
if(arguments.length === 0) {
return new realDate(1929, 10-1, 24);
} else {
return new realDate(
arguments[0], arguments[1], arguments[2]);
}
};
assertEqual( daysThisMonth(), 31 );
Date = realDate;
//////////////////////// CLEAN //////////////////////////
// Gross, isn't it? We want to test a function's
// interface, not its implementation. It is much easier
// to test daysInMonth(). Pick a month and write the
// test. (Thirty days hath September, April, June and
// November...)
assertEqual( daysInMonth(1929, 10), 31 );
console.log("All tests pass.");
/********************************************************
B A C K G R O U N D C O D E
********************************************************/
function daysThisMonth() {
var date = new Date(),
y = date.getFullYear(),
m = date.getMonth(),
start = new Date(y, m, 1),
end = new Date(y, m + 1, 1);
return (end - start) / (1000 * 60 * 60 * 24);
}
function daysInMonth(y, m) {
var start = new Date(y, m - 1, 1),
end = new Date(y, m, 1);
return (end - start) / (1000 * 60 * 60 * 24);
}
function assertEqual(x,y, msg) {
if(x != y) throw("expected "+x+" to equal "+y);
}
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