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76 lines
1.7 KiB
Go
76 lines
1.7 KiB
Go
package record
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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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type MapType = map[string]int
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type MapTypeString = map[string]string
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type MapTypeO = map[string]O.Option[int]
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func TestSimpleTraversalWithIndex(t *testing.T) {
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f := func(k string, n int) O.Option[int] {
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if k != "a" {
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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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tWithIndex := TraverseWithIndex(
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O.Of[MapType],
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O.Map[MapType, func(int) MapType],
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O.Ap[MapType, int],
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f)
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assert.Equal(t, O.None[MapType](), F.Pipe1(MapType{"a": 1, "b": 2}, tWithIndex))
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assert.Equal(t, O.Some(MapType{"b": 2}), F.Pipe1(MapType{"b": 2}, tWithIndex))
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}
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func TestSimpleTraversalNoIndex(t *testing.T) {
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f := func(k string) O.Option[string] {
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if k != "1" {
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return O.Some(k)
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}
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return O.None[string]()
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}
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tWithoutIndex := Traverse(
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O.Of[MapTypeString],
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O.Map[MapTypeString, func(string) MapTypeString],
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O.Ap[MapTypeString, string],
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f)
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assert.Equal(t, O.None[MapTypeString](), F.Pipe1(MapTypeString{"a": "1", "b": "2"}, tWithoutIndex))
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assert.Equal(t, O.Some(MapTypeString{"b": "2"}), F.Pipe1(MapTypeString{"b": "2"}, tWithoutIndex))
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}
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func TestSequence(t *testing.T) {
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// source map
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simpleMapO := MapTypeO{"a": O.Of(1), "b": O.Of(2)}
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// convert to an option of record
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s := Traverse(
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O.Of[MapType],
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O.Map[MapType, func(int) MapType],
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O.Ap[MapType, int],
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F.Identity[O.Option[int]],
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)
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assert.Equal(t, O.Of(MapType{"a": 1, "b": 2}), F.Pipe1(simpleMapO, s))
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s1 := Sequence(
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O.Of[MapType],
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O.Map[MapType, func(int) MapType],
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O.Ap[MapType, int],
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simpleMapO,
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)
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assert.Equal(t, O.Of(MapType{"a": 1, "b": 2}), s1)
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}
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