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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package branch | ||
|
|
||
| import ( | ||
| "reflect" | ||
| "testing" | ||
|
|
||
| corestore "cosmossdk.io/core/store" | ||
| ) | ||
|
|
||
| func TestMergedIterator_Next(t *testing.T) { | ||
| specs := map[string]struct { | ||
| setup func() corestore.Iterator | ||
| exp [][2]string | ||
| }{ | ||
| "both iterators are empty": { | ||
| setup: func() corestore.Iterator { | ||
| parent := newMemState() | ||
| cache := newMemState() | ||
| return mergeIterators(must(parent.Iterator(nil, nil)), must(cache.Iterator(nil, nil)), true) | ||
| }, | ||
| }, | ||
| "parent iterator has one item, cache is empty": { | ||
| setup: func() corestore.Iterator { | ||
| parent := newMemState() | ||
| if err := parent.Set([]byte("k1"), []byte("1")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| cache := newMemState() | ||
| return mergeIterators(must(parent.Iterator(nil, nil)), must(cache.Iterator(nil, nil)), true) | ||
| }, | ||
| exp: [][2]string{{"k1", "1"}}, | ||
| }, | ||
| "cache has one item, parent is empty": { | ||
| setup: func() corestore.Iterator { | ||
| parent := newMemState() | ||
| cache := newMemState() | ||
| if err := cache.Set([]byte("k1"), []byte("1")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| return mergeIterators(must(parent.Iterator(nil, nil)), must(cache.Iterator(nil, nil)), true) | ||
| }, | ||
| exp: [][2]string{{"k1", "1"}}, | ||
| }, | ||
| "both iterators have same key, cache preferred": { | ||
| setup: func() corestore.Iterator { | ||
| parent := newMemState() | ||
| if err := parent.Set([]byte("k1"), []byte("parent-val")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| cache := newMemState() | ||
| if err := cache.Set([]byte("k1"), []byte("cache-val")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| return mergeIterators(must(parent.Iterator(nil, nil)), must(cache.Iterator(nil, nil)), true) | ||
| }, | ||
| exp: [][2]string{{"k1", "cache-val"}}, | ||
| }, | ||
| "both iterators have same key, but cache value is nil": { | ||
| setup: func() corestore.Iterator { | ||
| parent := newMemState() | ||
| if err := parent.Set([]byte("k1"), []byte("1")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| cache := newMemState() | ||
| if err := cache.Set([]byte("k1"), nil); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| return mergeIterators(must(parent.Iterator(nil, nil)), must(cache.Iterator(nil, nil)), true) | ||
| }, | ||
| }, | ||
| "parent and cache are ascending": { | ||
| setup: func() corestore.Iterator { | ||
| parent := newMemState() | ||
| if err := parent.Set([]byte("k2"), []byte("v2")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if err := parent.Set([]byte("k3"), []byte("v3")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| cache := newMemState() | ||
| if err := cache.Set([]byte("k1"), []byte("v1")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if err := cache.Set([]byte("k4"), []byte("v4")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| return mergeIterators(must(parent.Iterator(nil, nil)), must(cache.Iterator(nil, nil)), true) | ||
| }, | ||
| exp: [][2]string{{"k1", "v1"}, {"k2", "v2"}, {"k3", "v3"}, {"k4", "v4"}}, | ||
| }, | ||
| "parent and cache are descending": { | ||
| setup: func() corestore.Iterator { | ||
| parent := newMemState() | ||
| if err := parent.Set([]byte("k3"), []byte("v3")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if err := parent.Set([]byte("k2"), []byte("v2")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| cache := newMemState() | ||
| if err := cache.Set([]byte("k4"), []byte("v4")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if err := cache.Set([]byte("k1"), []byte("v1")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| return mergeIterators(must(parent.ReverseIterator(nil, nil)), must(cache.ReverseIterator(nil, nil)), false) | ||
| }, | ||
| exp: [][2]string{{"k4", "v4"}, {"k3", "v3"}, {"k2", "v2"}, {"k1", "v1"}}, | ||
| }, | ||
| } | ||
| for name, spec := range specs { | ||
| t.Run(name, func(t *testing.T) { | ||
| var got [][2]string | ||
| for iter := spec.setup(); iter.Valid(); iter.Next() { | ||
| got = append(got, [2]string{string(iter.Key()), string(iter.Value())}) | ||
| } | ||
| if !reflect.DeepEqual(spec.exp, got) { | ||
| t.Errorf("expected: %#v, got: %#v", spec.exp, got) | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| func must[T any](r T, err error) T { | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return r | ||
| } |
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