gjstest（Google JS Test）是在 V8 引擎上快速运行 javascript 单元测试框架的工具，且不需要用户启动完整的浏览器。当然，假如你在 V8 上面测试的时候没有浏览器也没有 DOM 的话，你可以使用本工具来完成测试。
特征如下：
能够极快的启动测试和执行测试，且不需要运行浏览器
输出可读的测试结果，测试失败也可读、明了
一个基于浏览器的测试运行工具能够随 JS 的变化而变化
风格和语义都类似 C＋＋风格
内置模拟框架，所以只需要极少的代码即可完成测试
代码示例：
function UserInfoTest() {
// Each test function gets its own instance of UserInfoTest, so tests can
// use instance variables to store state that doesn't affect other tests.
// There's no need to write a tearDown method, unless you modify global
// state.
//
// Create an instance of the class under test here, giving it a mock
// function that we also keep a reference to below.
this.getInfoFromDb_ = createMockFunction();
this.userInfo_ = new UserInfo(this.getInfoFromDb_);
}
registerTestSuite(UserInfoTest);
addTest(UserInfoTest, function formatsUSPhoneNumber() {
// Expect a call to the database function with the argument 0xdeadbeef. When
// the call is received, return the supplied string.
expectCall(this.getInfoFromDb_)(0xdeadbeef)
.willOnce(returnWith('phone_number: "650 253 0000"'));
// Make sure that our class returns correctly formatted output.
expectEq('(650) 253-0000', this.userInfo_.getPhoneForId(0xdeadbeef));
});
addTest(UserInfoTest, function returnsLastNameFirst() {
expectCall(this.getInfoFromDb_)(0xdeadbeef)
.willOnce(returnWith('given_name: "John" family_name: "Doe"'));
// Make sure that our class puts the last name first.
expectEq('Doe, John', this.userInfo_.getNameForId(0xdeadbeef));
});
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