test: fix rand.Read will generate same key (#46870)

close #46869
pingcap · Sep 11, 2023 · 17baf99 · 17baf99
1 parent f0a5529
commit 17baf99
Showing 1 changed file with 8 additions and 4 deletions.
diff --git a/br/pkg/lightning/backend/external/split_test.go b/br/pkg/lightning/backend/external/split_test.go
@@ -42,10 +42,14 @@ func TestGeneralProperties(t *testing.T) {
 	for i := range keys {
 		keyLen := rand.Intn(100) + 1
 		valueLen := rand.Intn(100) + 1
-		keys[i] = make([]byte, keyLen)
-		values[i] = make([]byte, valueLen)
-		rand.Read(keys[i])
-		rand.Read(values[i])
+		keys[i] = make([]byte, keyLen+2)
+		values[i] = make([]byte, valueLen+2)
+		rand.Read(keys[i][:keyLen])
+		rand.Read(values[i][:valueLen])
+		keys[i][keyLen] = byte(i / 255)
+		keys[i][keyLen+1] = byte(i % 255)
+		values[i][valueLen] = byte(i / 255)
+		values[i][valueLen+1] = byte(i % 255)
 	}
 
 	dataFiles, statFiles, err := MockExternalEngine(memStore, keys, values)