clientv3: relax the checking condition in test

clientv3/snapshot/v3_snapshot_test.go

@@ -21,6 +21,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 	"time"
 
@@ -170,17 +171,19 @@ func TestCorruptedBackupFileCheck(t *testing.T) {
 
 	sp := NewV3(zap.NewExample())
 	_, err := sp.Status(dbPath)
-	expectedErrString :=
-		"snapshot file integrity check failed. 2 errors found.\n" +
-			"page 3: already freed\n" +
-			"page 4: unreachable unfreed"
+	expectedErrKeywords := "snapshot file integrity check failed"
+	/* example error message:
+	snapshot file integrity check failed. 2 errors found.
+	page 3: already freed
+	page 4: unreachable unfreed
+	*/
 	if err == nil {
-		t.Errorf("expected to get the following error message, got no error\n%s", expectedErrString)
+		t.Error("expected error due to corrupted snapshot file, got no error")
 	}
-	if err.Error() != expectedErrString {
-		t.Errorf("expected error message:\n %s\n"+
-			"actual error message:\n %s",
-			expectedErrString, err.Error())
+	if !strings.Contains(err.Error(), expectedErrKeywords) {
+		t.Errorf("expected error message to contain the following keywords:\n%s\n"+
+			"actual error message:\n%s",
+			expectedErrKeywords, err.Error())
 	}
 }