node.js自动化测试断言包assert的方法说明

Assent 断言模板包含如下方法:

assert.fail(actual, expected, message, operator)

assert.ok(value, [message])

assert.equal(actual, expected, [message])

assert.notEqual(actual, expected, [message])

assert.deepEqual(actual, expected, [message])

assert.notDeepEqual(actual, expected, [message])

assert.strictEqual(actual, expected, [message])

assert.notStrictEqual(actual, expected, [message])

assert.throws(block, [error], [message])

assert.doesNotThrow(block, [error], [message])

assert.ifError(value)

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