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29 lines
692 B
Go
29 lines
692 B
Go
package testing
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import (
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"testing"
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AR "github.com/ibm/fp-go/internal/array"
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M "github.com/ibm/fp-go/monoid"
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"github.com/stretchr/testify/assert"
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)
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func assertLaws[A any](t *testing.T, m M.Monoid[A]) func(a A) bool {
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e := m.Empty()
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return func(a A) bool {
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return assert.Equal(t, a, m.Concat(a, e), "Monoid right identity") &&
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assert.Equal(t, a, m.Concat(e, a), "Monoid left identity")
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}
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}
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// AssertLaws asserts the monoid laws for a dataset
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func AssertLaws[A any](t *testing.T, m M.Monoid[A]) func(data []A) bool {
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law := assertLaws(t, m)
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return func(data []A) bool {
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return AR.Reduce(data, func(result bool, value A) bool {
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return result && law(value)
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}, true)
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}
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}
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