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39 lines
1.0 KiB
Go
39 lines
1.0 KiB
Go
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[string, int]("a")), F.Pipe1(Left[string, 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[string, int]("a")), seq(Left[string, 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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