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https://github.com/IBM/fp-go.git
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80 lines
1.9 KiB
Go
80 lines
1.9 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 iso
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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)
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var (
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mToKm = MakeIso(
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func(m float32) float32 {
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return m / 1000
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},
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func(km float32) float32 {
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return km * 1000
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},
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)
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kmToMile = MakeIso(
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func(km float32) float32 {
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return km * 0.621371
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},
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func(mile float32) float32 {
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return mile / 0.621371
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},
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)
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)
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func TestGet(t *testing.T) {
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assert.Equal(t, mToKm.Get(100), float32(0.1))
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assert.Equal(t, Unwrap[float32, float32](float32(100))(mToKm), float32(0.1))
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assert.Equal(t, To[float32, float32](float32(100))(mToKm), float32(0.1))
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}
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func TestReverseGet(t *testing.T) {
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assert.Equal(t, mToKm.ReverseGet(1.2), float32(1200))
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assert.Equal(t, Wrap[float32](float32(1.2))(mToKm), float32(1200))
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assert.Equal(t, From[float32](float32(1.2))(mToKm), float32(1200))
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}
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func TestModify(t *testing.T) {
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double := func(x float32) float32 {
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return x * 2
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}
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assert.Equal(t, float32(2000), Modify[float32](double)(mToKm)(float32(1000)))
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}
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func TestReverse(t *testing.T) {
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double := func(x float32) float32 {
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return x * 2
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}
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assert.Equal(t, float32(4000), Modify[float32](double)(Reverse(mToKm))(float32(2000)))
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}
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func TestCompose(t *testing.T) {
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comp := Compose[float32](mToKm)(kmToMile)
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assert.InDelta(t, 0.93, comp.Get(1500), 0.01)
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assert.InDelta(t, 1609.34, comp.ReverseGet(1), 0.01)
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}
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