mirror of
https://github.com/IBM/fp-go.git
synced 2025-11-27 22:28:29 +02:00
137 lines
3.2 KiB
Go
137 lines
3.2 KiB
Go
// Copyright (c) 2023 - 2025 IBM Corp.
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// All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ioeither
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import (
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"fmt"
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"testing"
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E "github.com/IBM/fp-go/v2/either"
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F "github.com/IBM/fp-go/v2/function"
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"github.com/IBM/fp-go/v2/internal/utils"
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"github.com/IBM/fp-go/v2/io"
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I "github.com/IBM/fp-go/v2/io"
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O "github.com/IBM/fp-go/v2/option"
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"github.com/stretchr/testify/assert"
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)
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func TestMap(t *testing.T) {
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assert.Equal(t, E.Of[error](2), F.Pipe1(
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Of[error](1),
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Map[error](utils.Double),
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)())
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}
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func TestChainEitherK(t *testing.T) {
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f := ChainEitherK(func(n int) E.Either[string, int] {
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if n > 0 {
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return E.Of[string](n)
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}
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return E.Left[int]("a")
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})
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assert.Equal(t, E.Right[string](1), f(Right[string](1))())
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assert.Equal(t, E.Left[int]("a"), f(Right[string](-1))())
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assert.Equal(t, E.Left[int]("b"), f(Left[int]("b"))())
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}
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func TestChainOptionK(t *testing.T) {
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f := ChainOptionK[int, int](F.Constant("a"))(func(n int) O.Option[int] {
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if n > 0 {
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return O.Some(n)
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}
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return O.None[int]()
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})
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assert.Equal(t, E.Right[string](1), f(Right[string](1))())
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assert.Equal(t, E.Left[int]("a"), f(Right[string](-1))())
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assert.Equal(t, E.Left[int]("b"), f(Left[int]("b"))())
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}
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func TestFromOption(t *testing.T) {
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f := FromOption[int](F.Constant("a"))
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assert.Equal(t, E.Right[string](1), f(O.Some(1))())
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assert.Equal(t, E.Left[int]("a"), f(O.None[int]())())
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}
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func TestChainIOK(t *testing.T) {
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f := ChainIOK[string](func(n int) I.IO[string] {
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return func() string {
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return fmt.Sprintf("%d", n)
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}
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})
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assert.Equal(t, E.Right[string]("1"), f(Right[string](1))())
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assert.Equal(t, E.Left[string]("b"), f(Left[int]("b"))())
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}
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func TestChainWithIO(t *testing.T) {
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r := F.Pipe1(
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Of[error]("test"),
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// sad, we need the generics version ...
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io.Map(E.IsRight[error, string]),
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)
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assert.True(t, r())
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}
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func TestChainFirst(t *testing.T) {
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f := func(a string) IOEither[string, int] {
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if len(a) > 2 {
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return Of[string](len(a))
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}
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return Left[int]("foo")
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}
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good := Of[string]("foo")
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bad := Of[string]("a")
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ch := ChainFirst(f)
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assert.Equal(t, E.Of[string]("foo"), F.Pipe1(good, ch)())
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assert.Equal(t, E.Left[string]("foo"), F.Pipe1(bad, ch)())
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}
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func TestChainFirstIOK(t *testing.T) {
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f := func(a string) I.IO[int] {
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return I.Of(len(a))
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}
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good := Of[string]("foo")
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ch := ChainFirstIOK[string](f)
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assert.Equal(t, E.Of[string]("foo"), F.Pipe1(good, ch)())
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}
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func TestApFirst(t *testing.T) {
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x := F.Pipe1(
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Of[error]("a"),
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ApFirst[string](Of[error]("b")),
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)
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assert.Equal(t, E.Of[error]("a"), x())
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}
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func TestApSecond(t *testing.T) {
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x := F.Pipe1(
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Of[error]("a"),
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ApSecond[string](Of[error]("b")),
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)
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assert.Equal(t, E.Of[error]("b"), x())
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}
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