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54 lines
1.6 KiB
Go
54 lines
1.6 KiB
Go
// Copyright (c) 2023 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 either
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import (
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"testing"
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F "github.com/IBM/fp-go/function"
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O "github.com/IBM/fp-go/option"
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"github.com/stretchr/testify/assert"
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)
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func TestTraverse(t *testing.T) {
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f := func(n int) O.Option[int] {
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if n >= 2 {
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return O.Of(n)
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}
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return O.None[int]()
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}
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trav := Traverse[string, int, int, O.Option[Either[string, int]]](
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O.Of[Either[string, int]],
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O.MonadMap[int, Either[string, int]],
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)(f)
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assert.Equal(t, O.Of(Left[int]("a")), F.Pipe1(Left[int]("a"), trav))
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assert.Equal(t, O.None[Either[string, int]](), F.Pipe1(Right[string](1), trav))
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assert.Equal(t, O.Of(Right[string](3)), F.Pipe1(Right[string](3), trav))
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}
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func TestSequence(t *testing.T) {
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seq := Sequence(
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O.Of[Either[string, int]],
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O.MonadMap[int, Either[string, int]],
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)
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assert.Equal(t, O.Of(Right[string](1)), seq(Right[string](O.Of(1))))
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assert.Equal(t, O.Of(Left[int]("a")), seq(Left[O.Option[int]]("a")))
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assert.Equal(t, O.None[Either[string, int]](), seq(Right[string](O.None[int]())))
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}
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