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

describe(" Mock Function provides 3 features",()=>{
    test("1.Capture calls 呼び出しを追跡する",()=>{
        const mock = jest.fn()
        let result = mock("foo")

        expect(result).toBeUndefined()
        expect(mock).toHaveBeenCalled()
        expect(mock).toHaveBeenCalledTimes(1)
        expect(mock).toHaveBeenCalledWith("foo")
    })
})