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49 lines
1.2 KiB
Go
49 lines
1.2 KiB
Go
package either
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import (
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"testing"
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M "github.com/ibm/fp-go/monoid/testing"
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N "github.com/ibm/fp-go/number"
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"github.com/stretchr/testify/assert"
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)
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func TestApplySemigroup(t *testing.T) {
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sg := ApplySemigroup[string](N.SemigroupSum[int]())
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la := Left[string, int]("a")
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lb := Left[string, int]("b")
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r1 := Right[string](1)
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r2 := Right[string](2)
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r3 := Right[string](3)
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assert.Equal(t, la, sg.Concat(la, lb))
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assert.Equal(t, lb, sg.Concat(r1, lb))
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assert.Equal(t, la, sg.Concat(la, r2))
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assert.Equal(t, lb, sg.Concat(r1, lb))
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assert.Equal(t, r3, sg.Concat(r1, r2))
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}
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func TestApplicativeMonoid(t *testing.T) {
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m := ApplicativeMonoid[string](N.MonoidSum[int]())
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la := Left[string, int]("a")
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lb := Left[string, int]("b")
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r1 := Right[string](1)
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r2 := Right[string](2)
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r3 := Right[string](3)
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assert.Equal(t, la, m.Concat(la, m.Empty()))
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assert.Equal(t, lb, m.Concat(m.Empty(), lb))
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assert.Equal(t, r1, m.Concat(r1, m.Empty()))
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assert.Equal(t, r2, m.Concat(m.Empty(), r2))
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assert.Equal(t, r3, m.Concat(r1, r2))
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}
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func TestApplicativeMonoidLaws(t *testing.T) {
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m := ApplicativeMonoid[string](N.MonoidSum[int]())
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M.AssertLaws(t, m)([]Either[string, int]{Left[string, int]("a"), Right[string](1)})
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}
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