import * as app from "./App"
import * as math from "./src/math"

describe(" Mock Function provides 3 features",()=>{
    test("2-1.Set return values 戻値をセットする fn()",()=>{
        const mock = jest.fn(() => "bar")

        expect(mock("foo")).toBe("bar")
        expect(mock).toHaveBeenCalledWith("foo")
    })
})