test: clean up reward-hacking backend tests (#5563)

common/url_validator_test.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"strings"
 	"testing"
 
 	"github.com/QuantumNous/new-api/constant"
@@ -107,7 +108,7 @@ func TestValidateRedirectURL(t *testing.T) {
 					t.Errorf("ValidateRedirectURL(%q) expected error containing %q, got nil", tt.url, tt.errContains)
 					return
 				}
-				if tt.errContains != "" && !contains(err.Error(), tt.errContains) {
+				if tt.errContains != "" && !strings.Contains(err.Error(), tt.errContains) {
 					t.Errorf("ValidateRedirectURL(%q) error = %q, want error containing %q", tt.url, err.Error(), tt.errContains)
 				}
 			} else {
@@ -118,17 +119,3 @@ func TestValidateRedirectURL(t *testing.T) {
 		})
 	}
 }
-
-func contains(s, substr string) bool {
-	return len(s) >= len(substr) && (s == substr || len(substr) == 0 ||
-		(len(s) > 0 && len(substr) > 0 && findSubstring(s, substr)))
-}
-
-func findSubstring(s, substr string) bool {
-	for i := 0; i <= len(s)-len(substr); i++ {
-		if s[i:i+len(substr)] == substr {
-			return true
-		}
-	}
-	return false
-}