func TestApp_List(t *testing.T) {
    ctrl := gomock.NewController(t)
    defer ctrl.Finish()
    mockStorage := NewMockStorage(ctrl)
    app := New(mockStorage)
    portStr, err := testtool.GetFreePort()
    require.NoError(t, err, "unable to get free port")
    port, _ := strconv.Atoi(portStr)
    go func() {
        app.Start(port)
    }()
    gomock.InOrder(
        mockStorage.EXPECT().GetAll(),
    )
    req := httptest.NewRequest("GET", "http://example.com/", nil)
    w := httptest.NewRecorder()
    app.list(w, req)
}