Jest 中的 describe 和 it 有什么区别? [英] What is the difference between describe and it in Jest?
问题描述
当用 Jest
或 Jasmine
编写单元测试时,你什么时候使用 describe
?
When writing a unit test in Jest
or Jasmine
when do you use describe
?
你什么时候使用it
?
我经常这样做
describe('my beverage', () => {
test('is delicious', () => {
});
});
什么时候需要一个新的describe
或一个新的it
?
When is it time for a new describe
or a new it
?
推荐答案
describe
将您的测试套件分解为多个组件.根据您的测试策略,您可能会对类中的每个函数、插件的每个模块或每个面向用户的功能进行描述.
describe
breaks your test suite into components. Depending on your test strategy, you might have a describe for each function in your class, each module of your plugin, or each user-facing piece of functionality.
您还可以嵌套描述以进一步细分套件.
You can also nest describes to further subdivide the suite.
it
是您执行单个测试的地方.您应该能够像一个小句子一样描述每个测试,例如它在设置半径时计算面积".您不应该能够进一步细分测试——如果您觉得需要,请改用 describe
.
it
is where you perform individual tests. You should be able to describe each test like a little sentence, such as "it calculates the area when the radius is set". You shouldn't be able to subdivide tests further-- if you feel like you need to, use describe
instead.
describe('Circle class', function() {
describe('area is calculated when', function() {
it('sets the radius', function() { ... });
it('sets the diameter', function() { ... });
it('sets the circumference', function() { ... });
});
});
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