mirror of
https://github.com/IBM/fp-go.git
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113 lines
3.1 KiB
Go
113 lines
3.1 KiB
Go
// Copyright (c) 2023 - 2025 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 readeroption
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import (
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"context"
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"testing"
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O "github.com/IBM/fp-go/v2/option"
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"github.com/stretchr/testify/assert"
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)
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func TestFrom0(t *testing.T) {
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// Function that returns a value from context
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getConfig := func(ctx context.Context) (string, bool) {
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if val := ctx.Value("config"); val != nil {
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return val.(string), true
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}
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return "", false
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}
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roFunc := From0(getConfig)
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ro := roFunc()
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// Test with value in context
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ctx1 := context.WithValue(context.Background(), "config", "test-config")
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result1 := ro(ctx1)
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assert.Equal(t, O.Of("test-config"), result1)
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// Test without value in context
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ctx2 := context.Background()
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result2 := ro(ctx2)
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assert.Equal(t, O.None[string](), result2)
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}
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func TestFrom1(t *testing.T) {
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// Function that looks up a value by key
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lookup := func(ctx context.Context, key string) (int, bool) {
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if val := ctx.Value(key); val != nil {
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return val.(int), true
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}
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return 0, false
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}
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roFunc := From1(lookup)
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// Test with value in context
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ctx1 := context.WithValue(context.Background(), "count", 42)
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result1 := roFunc("count")(ctx1)
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assert.Equal(t, O.Of(42), result1)
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// Test without value in context
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ctx2 := context.Background()
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result2 := roFunc("count")(ctx2)
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assert.Equal(t, O.None[int](), result2)
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}
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func TestFrom2(t *testing.T) {
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// Function that combines two parameters with context
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combine := func(ctx context.Context, a string, b int) (string, bool) {
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if ctx.Value("enabled") == true {
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return a + ":" + string(rune('0'+b)), true
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}
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return "", false
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}
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roFunc := From2(combine)
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// Test with enabled context
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ctx1 := context.WithValue(context.Background(), "enabled", true)
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result1 := roFunc("test", 5)(ctx1)
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assert.Equal(t, O.Of("test:5"), result1)
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// Test with disabled context
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ctx2 := context.Background()
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result2 := roFunc("test", 5)(ctx2)
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assert.Equal(t, O.None[string](), result2)
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}
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func TestFrom3(t *testing.T) {
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// Function that combines three parameters with context
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combine := func(ctx context.Context, a string, b int, c bool) (string, bool) {
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if ctx.Value("enabled") == true && c {
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return a + ":" + string(rune('0'+b)), true
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}
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return "", false
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}
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roFunc := From3(combine)
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// Test with enabled context and true flag
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ctx1 := context.WithValue(context.Background(), "enabled", true)
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result1 := roFunc("test", 5, true)(ctx1)
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assert.Equal(t, O.Of("test:5"), result1)
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// Test with false flag
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result2 := roFunc("test", 5, false)(ctx1)
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assert.Equal(t, O.None[string](), result2)
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}
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