added test for RENAME command

echovault/api_generic_test.go

@@ -1184,3 +1184,58 @@ func TestEchoVault_DECRBY(t *testing.T) {
 		})
 	}
 }
+
+func TestEchoVault_Rename(t *testing.T) {
+	server := createEchoVault()
+
+	tests := []struct {
+		name         string
+		oldKey       string
+		newKey       string
+		presetValues map[string]internal.KeyData
+		want         string
+		wantErr      bool
+	}{
+		{
+			name:         "1. Rename existing key",
+			oldKey:       "oldKey1",
+			newKey:       "newKey1",
+			presetValues: map[string]internal.KeyData{"oldKey1": {Value: "value1"}},
+			want:         "OK",
+			wantErr:      false,
+		},
+		{
+			name:         "2. Rename non-existent key",
+			oldKey:       "oldKey2",
+			newKey:       "newKey2",
+			presetValues: nil,
+			want:         "",
+			wantErr:      true,
+		},
+		{
+			name:         "3. Rename to existing key",
+			oldKey:       "oldKey3",
+			newKey:       "newKey4",
+			presetValues: map[string]internal.KeyData{"oldKey3": {Value: "value3"}, "newKey4": {Value: "value4"}},
+			want:         "OK",
+			wantErr:      false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.presetValues != nil {
+				for k, d := range tt.presetValues {
+					presetKeyData(server, context.Background(), k, d)
+				}
+			}
+			got, err := server.Rename(tt.oldKey, tt.newKey)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Rename() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("Rename() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}