TestKit backend: except txMeta as Cypher types (#414)

Co-authored-by: Florent Biville <florent.biville@neo4j.com>

testkit-backend/backend.go

@@ -247,8 +247,8 @@ func (b *backend) toTransactionConfigApply(data map[string]any) func(*neo4j.Tran
 	txConfig := neo4j.TransactionConfig{Timeout: math.MinInt}
 	// Optional transaction meta data
 	if data["txMeta"] != nil {
-		txMetadata := data["txMeta"].(map[string]any)
-		if err := patchNumbersInMap(txMetadata); err != nil {
+		txMetadata, err := b.toParams(data["txMeta"].(map[string]any))
+		if err != nil {
 			panic(err)
 		}
 		txConfig.Metadata = txMetadata
@@ -268,15 +268,25 @@ func (b *backend) toTransactionConfigApply(data map[string]any) func(*neo4j.Tran
 }
 
 func (b *backend) toCypherAndParams(data map[string]any) (string, map[string]any, error) {
-	cypher := data["cypher"].(string)
-	params, _ := data["params"].(map[string]any)
-	var err error
-	for i, p := range params {
-		if params[i], err = cypherToNative(p); err != nil {
-			return "", nil, err
+	rawParameters, _ := data["params"].(map[string]any)
+	parameters, err := b.toParams(rawParameters)
+	if err != nil {
+		return "", nil, err
+	}
+	query := data["cypher"].(string)
+	return query, parameters, nil
+}
+
+func (b *backend) toParams(parameters map[string]any) (map[string]any, error) {
+	result := make(map[string]any, len(parameters))
+	for name, rawParam := range parameters {
+		param, err := cypherToNative(rawParam)
+		if err != nil {
+			return nil, err
 		}
+		result[name] = param
 	}
-	return cypher, params, nil
+	return result, nil
 }
 
 func (b *backend) handleTransactionFunc(isRead bool, data map[string]any) {