mirror of
https://github.com/IBM/fp-go.git
synced 2025-11-27 22:28:29 +02:00
143 lines
3.7 KiB
Go
143 lines
3.7 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 result
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import (
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"errors"
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"fmt"
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"testing"
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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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IO "github.com/IBM/fp-go/v2/io"
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O "github.com/IBM/fp-go/v2/option"
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S "github.com/IBM/fp-go/v2/string"
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"github.com/stretchr/testify/assert"
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)
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func TestIsLeft(t *testing.T) {
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err := errors.New("Some error")
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withError := Left[string](err)
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assert.True(t, IsLeft(withError))
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assert.False(t, IsRight(withError))
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}
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func TestIsRight(t *testing.T) {
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noError := Right("Carsten")
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assert.True(t, IsRight(noError))
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assert.False(t, IsLeft(noError))
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}
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func TestMapEither(t *testing.T) {
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e := errors.New("s")
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assert.Equal(t, F.Pipe1(Right("abc"), Map(utils.StringLen)), Right(3))
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val2 := F.Pipe1(Left[string](e), Map(utils.StringLen))
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exp2 := Left[int](e)
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assert.Equal(t, val2, exp2)
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}
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func TestUnwrapError(t *testing.T) {
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a := ""
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err := errors.New("Some error")
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withError := Left[string](err)
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res, extracted := UnwrapError(withError)
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assert.Equal(t, a, res)
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assert.Equal(t, extracted, err)
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}
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func TestReduce(t *testing.T) {
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s := S.Semigroup()
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assert.Equal(t, "foobar", F.Pipe1(Right("bar"), Reduce(s.Concat, "foo")))
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assert.Equal(t, "foo", F.Pipe1(Left[string](errors.New("bar")), Reduce(s.Concat, "foo")))
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}
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func TestAp(t *testing.T) {
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f := S.Size
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maError := errors.New("maError")
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mabError := errors.New("mabError")
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assert.Equal(t, Right(3), F.Pipe1(Right(f), Ap[int](Right("abc"))))
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assert.Equal(t, Left[int](maError), F.Pipe1(Right(f), Ap[int](Left[string](maError))))
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assert.Equal(t, Left[int](mabError), F.Pipe1(Left[func(string) int](mabError), Ap[int](Left[string](maError))))
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}
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func TestAlt(t *testing.T) {
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a := errors.New("a")
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b := errors.New("b")
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assert.Equal(t, Right(1), F.Pipe1(Right(1), Alt(F.Constant(Right(2)))))
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assert.Equal(t, Right(1), F.Pipe1(Right(1), Alt(F.Constant(Left[int](a)))))
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assert.Equal(t, Right(2), F.Pipe1(Left[int](b), Alt(F.Constant(Right(2)))))
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assert.Equal(t, Left[int](b), F.Pipe1(Left[int](a), Alt(F.Constant(Left[int](b)))))
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}
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func TestChainFirst(t *testing.T) {
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f := F.Flow2(S.Size, Right[int])
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maError := errors.New("maError")
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assert.Equal(t, Right("abc"), F.Pipe1(Right("abc"), ChainFirst(f)))
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assert.Equal(t, Left[string](maError), F.Pipe1(Left[string](maError), ChainFirst(f)))
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}
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func TestChainOptionK(t *testing.T) {
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a := errors.New("a")
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b := errors.New("b")
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f := ChainOptionK[int, int](F.Constant(a))(func(n int) 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, Right(1), f(Right(1)))
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assert.Equal(t, Left[int](a), f(Right(-1)))
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assert.Equal(t, Left[int](b), f(Left[int](b)))
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}
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func TestFromOption(t *testing.T) {
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none := errors.New("none")
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assert.Equal(t, Left[int](none), FromOption[int](F.Constant(none))(O.None[int]()))
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assert.Equal(t, Right(1), FromOption[int](F.Constant(none))(O.Some(1)))
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}
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func TestStringer(t *testing.T) {
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e := Of("foo")
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exp := "Right[string](foo)"
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assert.Equal(t, exp, e.String())
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var s fmt.Stringer = &e
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assert.Equal(t, exp, s.String())
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}
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func TestFromIO(t *testing.T) {
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f := IO.Of("abc")
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e := FromIO(f)
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assert.Equal(t, Right("abc"), e)
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}
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