99 lines
2.4 KiB
Go
99 lines
2.4 KiB
Go
package ttlcache
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import (
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"container/heap"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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)
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var _ heap.Interface = (*entryHeap)(nil)
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func TestExpiryHeap(t *testing.T) {
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h := NewExpiryHeap()
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ch := h.NotifyCh
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var entry, entry2, entry3 *Entry
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// Init, shouldn't trigger anything
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testNoMessage(t, ch)
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runStep(t, "add an entry", func(t *testing.T) {
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entry = h.Add("foo", 100*time.Millisecond)
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assert.Equal(t, 0, entry.heapIndex)
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testMessage(t, ch)
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testNoMessage(t, ch) // exactly one asserted above
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})
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runStep(t, "add a second entry in front", func(t *testing.T) {
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entry2 = h.Add("bar", 50*time.Millisecond)
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assert.Equal(t, 0, entry2.heapIndex)
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assert.Equal(t, 1, entry.heapIndex)
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testMessage(t, ch)
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testNoMessage(t, ch) // exactly one asserted above
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})
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runStep(t, "add a third entry at the end", func(t *testing.T) {
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entry3 = h.Add("baz", 1000*time.Millisecond)
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assert.Equal(t, 2, entry3.heapIndex)
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testNoMessage(t, ch) // no notify cause index 0 stayed the same
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})
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runStep(t, "remove the first entry", func(t *testing.T) {
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h.Remove(0)
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assert.Equal(t, 0, entry.heapIndex)
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assert.Equal(t, 1, entry3.heapIndex)
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testMessage(t, ch)
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testNoMessage(t, ch)
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})
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runStep(t, "update so that entry3 expires first", func(t *testing.T) {
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h.Update(entry.heapIndex, 2000*time.Millisecond)
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assert.Equal(t, 1, entry.heapIndex)
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assert.Equal(t, 0, entry3.heapIndex)
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testMessage(t, ch)
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testNoMessage(t, ch)
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})
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runStep(t, "0th element change triggers a notify", func(t *testing.T) {
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h.Update(entry3.heapIndex, 1500*time.Millisecond)
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assert.Equal(t, 1, entry.heapIndex) // no move
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assert.Equal(t, 0, entry3.heapIndex)
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testMessage(t, ch)
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testNoMessage(t, ch) // one message
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})
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runStep(t, "update can not decrease expiry time", func(t *testing.T) {
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h.Update(entry.heapIndex, 100*time.Millisecond)
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assert.Equal(t, 1, entry.heapIndex) // no move
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assert.Equal(t, 0, entry3.heapIndex)
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testNoMessage(t, ch) // no notify, because no change in the heap
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})
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}
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func testNoMessage(t *testing.T, ch <-chan struct{}) {
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t.Helper()
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select {
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case <-ch:
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t.Fatal("should not have a message")
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default:
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}
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}
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func testMessage(t *testing.T, ch <-chan struct{}) {
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t.Helper()
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select {
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case <-ch:
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default:
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t.Fatal("should have a message")
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}
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}
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func runStep(t *testing.T, name string, fn func(t *testing.T)) {
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if !t.Run(name, fn) {
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t.FailNow()
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}
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}
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