I need to test this scenario:

• in component:

t("some.key", { name: "Ash" })

• in json:

{ "some": { "key": "Hi {{name}}" }

I would like to spy "t" function and get in the tests what parameters was passed and what was returned.

some like this:

expect(spyed).toHaveBeenCaledWith("some.key", { name: "Ash" })
expect(spyed).toHaveReturnedWith("Hi Ash")

CodePudding user response：

Usually it is a bad practice to make your assertions on implementation details.

i18next as a special mode, called cimode, which will make your t function to return the key itself. This allows your test to make the assertions on the outcome of your actions (check that the element contains the key value).