测试工作——Assent 断言模板
Assert 断言模块
This module is used for writing unit tests for your applications, you can access it with require('assert').
断言（Assert）模块用于为应用编写单元测试，可以通过require('assert')对该模块进行调用。
assert.fail(actual, expected, message, operator)
Tests if actual is equal to expected using the operator provided.
使用指定操作符测试actual（真实值）是否和expected（期望值）一致。
assert.ok(value, [message])
Tests if value is a true value, it is equivalent to assert.equal(true, value, message);
测试实际值是否为true，和assert.equal(true, value, message);作用一致
assert.equal(actual, expected, [message])
Tests shallow, coercive equality with the equal comparison operator ( == ).
使用等值比较操作符( == )测试真实值是否浅层地（shallow），强制性地（coercive）和预期值相等。
assert.notEqual(actual, expected, [message])
Tests shallow, coercive non-equality with the not equal comparison operator ( != ).
使用不等比较操作符( != )测试真实值是否浅层地（shallow），强制性地（coercive）和预期值不相等。
assert.deepEqual(actual, expected, [message])
Tests for deep equality.
测试真实值是否深层次地和预期值相等。
assert.notDeepEqual(actual, expected, [message])
Tests for any deep inequality.
测试真实值是否深层次地和预期值不相等。
assert.strictEqual(actual, expected, [message])
Tests strict equality, as determined by the strict equality operator ( === )
使用严格相等操作符 ( === )测试真实值是否严格地（strict）和预期值相等。
assert.notStrictEqual(actual, expected, [message])
Tests strict non-equality, as determined by the strict not equal operator ( !== )
使用严格不相等操作符 ( !== )测试真实值是否严格地（strict）和预期值不相等。
assert.throws(block, [error], [message])
Expects block to throw an error. error can be constructor, regexp or validation function.
预期block时抛出一个错误（error）， error可以为构造函数，正则表达式或者其他验证器。
Validate instanceof using constructor:
使用构造函数验证实例：
assert.throws(
function() {
throw new Error("Wrong value");
},
Error);
Validate error message using RegExp:
使用正则表达式验证错误信息：
assert.throws(
function() {
throw new Error("Wrong value");
},
/value/);
Custom error validation:
用户自定义的错误验证器：
assert.throws(
function() {
throw new Error("Wrong value");
},
function(err) {
if ( (err instanceof Error) && /value/.test(err) ) {
return true;
}
},
"unexpected error");
assert.doesNotThrow(block, [error], [message])
Expects block not to throw an error, see assert.throws for details.
预期block时不抛出错误，详细信息请见assert.throws。
assert.ifError(value)
Tests if value is not a false value, throws if it is a true value. Useful when testing the first argument, error in callbacks.
测试值是否不为false，当为true时抛出。常用于回调中第一个参数error的测试。 - 一介布衣
转自：http://yijiebuyi.com/blog/ca2c0edf447624bd4d527490c9fce369.html