func TestIntExample(t *testing.T) {
addTwo := func(x int) result_int.Result {
return result_int.Success(2 + x)
}
success := result_int.Success(7).Bind(addTwo)
assert.Equal(t, result_int.Success(9), success)
err := errors.New("The error")
failure := result_int.Failure(err).Bind(addTwo)
assert.Equal(t, result_int.Failure(err), failure)
}
func TestSuccessChain(t *testing.T) {
r := result_int.Success(15).Chain(
func(x int) result_int.Result {
return result_int.Success(x + 2)
},
func(x int) result_int.Result {
return result_int.Success(x * 2)
},
func(x int) result_int.Result {
return result_int.Success(x / 3)
},
)
assert.Equal(t, result_int.Success(11), r)
}
func TestDeferCallToErrIsRequired(t *testing.T) {
executed := false
result_int.
Success(25).
Defer(func(x int) { executed = true })
assert.Equal(t, false, executed)
}
func TestDeferOnSuccess(t *testing.T) {
executed := false
var got int
result_int.
Success(35).
Defer(func(x int) { executed = true; got = x }).
Err()
assert.Equal(t, true, executed)
assert.Equal(t, 35, got)
}
func TestDeferIsPreserved(t *testing.T) {
executed := false
var got int
err := errors.New("The error")
result_int.
Success(24).
Defer(func(x int) { executed = true; got = x }).Bind(
func(x int) result_int.Result {
return result_int.Failure(err)
}).
Err()
assert.Equal(t, true, executed)
assert.Equal(t, 24, got)
}