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cache_test.go
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cache_test.go
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// Copyright (c) 2023 IBM Corp.
// All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package function
import (
"fmt"
"math/rand"
"testing"
"github.com/stretchr/testify/assert"
)
func TestCache(t *testing.T) {
var count int
withSideEffect := func(n int) int {
count++
return n
}
cached := Memoize(withSideEffect)
assert.Equal(t, 0, count)
assert.Equal(t, 10, cached(10))
assert.Equal(t, 1, count)
assert.Equal(t, 10, cached(10))
assert.Equal(t, 1, count)
assert.Equal(t, 20, cached(20))
assert.Equal(t, 2, count)
assert.Equal(t, 20, cached(20))
assert.Equal(t, 2, count)
assert.Equal(t, 10, cached(10))
assert.Equal(t, 2, count)
}
func TestSingleElementCache(t *testing.T) {
f := func(key string) string {
return fmt.Sprintf("%s: %d", key, rand.Int())
}
cb := CacheCallback(func(s string) string { return s }, SingleElementCache[string, string]())
cf := cb(f)
v1 := cf("1")
v2 := cf("1")
v3 := cf("2")
v4 := cf("1")
assert.Equal(t, v1, v2)
assert.NotEqual(t, v2, v3)
assert.NotEqual(t, v3, v4)
assert.NotEqual(t, v1, v4)
}