github.com/dtroyer-salad/og2/v2@v2.0.0-20240412154159-c47231610877/internal/syncutil/merge_test.go (about) 1 /* 2 Copyright The ORAS Authors. 3 Licensed under the Apache License, Version 2.0 (the "License"); 4 you may not use this file except in compliance with the License. 5 You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9 Unless required by applicable law or agreed to in writing, software 10 distributed under the License is distributed on an "AS IS" BASIS, 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 See the License for the specific language governing permissions and 13 limitations under the License. 14 */ 15 16 package syncutil 17 18 import ( 19 "context" 20 "testing" 21 22 "golang.org/x/sync/errgroup" 23 ) 24 25 func TestMerge(t *testing.T) { 26 var merge Merge[int] 27 28 // generate expected result 29 size := 100 30 factor := -1 31 var expected int 32 for i := 1; i < size; i++ { 33 expected += i * factor 34 } 35 36 // test merge 37 ctx := context.Background() 38 eg, _ := errgroup.WithContext(ctx) 39 var result int 40 for i := 1; i < size; i++ { 41 eg.Go(func(num int) func() error { 42 return func() error { 43 var f int 44 getFactor := func() error { 45 f = factor 46 return nil 47 } 48 calculate := func(items []int) error { 49 for _, item := range items { 50 result += item * f 51 } 52 return nil 53 } 54 return merge.Do(num, getFactor, calculate) 55 } 56 }(i)) 57 } 58 if err := eg.Wait(); err != nil { 59 t.Errorf("Merge.Do() error = %v, wantErr %v", err, nil) 60 } 61 if result != expected { 62 t.Errorf("Merge.Do() = %v, want %v", result, expected) 63 } 64 }