Is there a way to properly test the internal logic of this method?
For instance:
async method () {
this.isLoading = true;
await this.GET_OFFERS();
this.isLoading = false;
this.router.push("/somewhere");
}
This method toggles isLoading, executes an action, and navigates to a different location. How can I verify that isLoading is toggled correctly (true before the action is executed and false afterwards)?
Extract the rows containing this.isLoading into a separate function named setLoading() and verify if it has been invoked.
When using shallowMount/mount, the second parameter represents the mounting options that can be utilized to replace the component's data props during mounting. This allows for the implementation of a setter to simulate changes to the isLoading data prop, enabling verification of property modifications within the method being tested:
it('sets isLoading', () => {
const isLoadingSetter = jest.fn()
const wrapper = shallowMount(MyComponent, {
data() {
return {
// This setter is triggered when `this.isLoading = value` is called in the component.
set isLoading(value) {
isLoadingSetter(value)
}
}
}
})
//...
})
Subsequently, you can employ toHaveBeenCalledTimes() in conjunction with isLoadingSetter.mock.calls[] to inspect the arguments passed to the mocked setter in each invocation. To evaluate the consequences of an async function, await the method execution before asserting any outcomes:
it('sets isLoading', async () => {
//...
await wrapper.vm.method()
expect(isLoadingSetter).toHaveBeenCalledTimes(2)
expect(isLoadingSetter.mock.calls.[0][0]).toBe(true)
expect(isLoadingSetter.mock.calls.[1][0]).toBe(false)
})
If validating the invocation of GET_OFFERS() is also required, utilize jest.spyOn() on the component's method prior to mounting:
it('gets offers', async () => {
const getOfferSpy = jest.spyOn(MyComponent.methods, 'GET_OFFERS')
const wrapper = shallowMount(MyComponent, /*...*/)
await wrapper.vm.method()
expect(getOfferSpy).toHaveBeenCalledTimes(1)
})
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