moby--moby/pkg/truncindex/truncindex_test.go

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package truncindex
import "testing"
// Test the behavior of TruncIndex, an index for querying IDs from a non-conflicting prefix.
func TestTruncIndex(t *testing.T) {
ids := []string{}
index := NewTruncIndex(ids)
// Get on an empty index
if _, err := index.Get("foobar"); err == nil {
t.Fatal("Get on an empty index should return an error")
}
// Spaces should be illegal in an id
if err := index.Add("I have a space"); err == nil {
t.Fatalf("Adding an id with ' ' should return an error")
}
id := "99b36c2c326ccc11e726eee6ee78a0baf166ef96"
// Add an id
if err := index.Add(id); err != nil {
t.Fatal(err)
}
// Get a non-existing id
assertIndexGet(t, index, "abracadabra", "", true)
// Get the exact id
assertIndexGet(t, index, id, id, false)
// The first letter should match
assertIndexGet(t, index, id[:1], id, false)
// The first half should match
assertIndexGet(t, index, id[:len(id)/2], id, false)
// The second half should NOT match
assertIndexGet(t, index, id[len(id)/2:], "", true)
id2 := id[:6] + "blabla"
// Add an id
if err := index.Add(id2); err != nil {
t.Fatal(err)
}
// Both exact IDs should work
assertIndexGet(t, index, id, id, false)
assertIndexGet(t, index, id2, id2, false)
// 6 characters or less should conflict
assertIndexGet(t, index, id[:6], "", true)
assertIndexGet(t, index, id[:4], "", true)
assertIndexGet(t, index, id[:1], "", true)
// 7 characters should NOT conflict
assertIndexGet(t, index, id[:7], id, false)
assertIndexGet(t, index, id2[:7], id2, false)
// Deleting a non-existing id should return an error
if err := index.Delete("non-existing"); err == nil {
t.Fatalf("Deleting a non-existing id should return an error")
}
// Deleting id2 should remove conflicts
if err := index.Delete(id2); err != nil {
t.Fatal(err)
}
// id2 should no longer work
assertIndexGet(t, index, id2, "", true)
assertIndexGet(t, index, id2[:7], "", true)
assertIndexGet(t, index, id2[:11], "", true)
// conflicts between id and id2 should be gone
assertIndexGet(t, index, id[:6], id, false)
assertIndexGet(t, index, id[:4], id, false)
assertIndexGet(t, index, id[:1], id, false)
// non-conflicting substrings should still not conflict
assertIndexGet(t, index, id[:7], id, false)
assertIndexGet(t, index, id[:15], id, false)
assertIndexGet(t, index, id, id, false)
}
func assertIndexGet(t *testing.T, index *TruncIndex, input, expectedResult string, expectError bool) {
if result, err := index.Get(input); err != nil && !expectError {
t.Fatalf("Unexpected error getting '%s': %s", input, err)
} else if err == nil && expectError {
t.Fatalf("Getting '%s' should return an error", input)
} else if result != expectedResult {
t.Fatalf("Getting '%s' returned '%s' instead of '%s'", input, result, expectedResult)
}
}
func BenchmarkTruncIndexAdd(b *testing.B) {
ids := []string{"banana", "bananaa", "bananab"}
b.ResetTimer()
for i := 0; i < b.N; i++ {
index := NewTruncIndex([]string{})
for _, id := range ids {
index.Add(id)
}
}
}
func BenchmarkTruncIndexNew(b *testing.B) {
ids := []string{"banana", "bananaa", "bananab"}
b.ResetTimer()
for i := 0; i < b.N; i++ {
NewTruncIndex(ids)
}
}