func appMock(content []byte, err error) *mocks.IApp {
    prov := &mocks.IProvider{}
    prov.On("File", mock.Anything, dep_radar.Pkg("app_pkg"), "master", "glide.lock").Return(content, err)
    app := &mocks.IApp{}
    app.On("Package").Return(dep_radar.Pkg("app_pkg"))