func TestStringExample(t *testing.T) {
helloFn := func(name string) result_string.Result {
return result_string.Success("hello, " + name)
}
success := result_string.Success("world").Bind(helloFn)
assert.Equal(t, result_string.Success("hello, world"), success)
err := errors.New("The error")
failure := result_string.Failure(err).Bind(helloFn)
assert.Equal(t, result_string.Failure(err), failure)
}
func TestFailedChain(t *testing.T) {
err := errors.New("The error")
r := result_string.Success("world").Chain(
func(name string) result_string.Result {
return result_string.Success("hello, " + name)
},
func(greeting string) result_string.Result {
return result_string.Failure(err)
},
func(_ string) result_string.Result {
return result_string.Success("bye")
},
)
assert.Equal(t, result_string.Failure(err), r)
}
func TestOnErrorFn(t *testing.T) {
var called bool
var got error
var r result_string.Result
called = false
r = result_string.Success("yep!").
OnErrorFn(func(e error) { called = true })
assert.Equal(t, false, called)
assert.Equal(t, result_string.Success("yep!"), r)
called = false
err := errors.New("The error")
r = result_string.Failure(err).
OnErrorFn(func(e error) { called = true; got = e })
assert.Equal(t, true, called)
assert.Equal(t, err, got)
assert.Equal(t, result_string.Failure(err), r)
}