Corrected UtLambdaModel processing in AssembleModelGenerator (#1790)

Author: EgorkaKulikov

utbot-framework/src/main/kotlin/org/utbot/framework/assemble/AssembleModelGenerator.kt

@@ -187,8 +187,8 @@ class AssembleModelGenerator(private val basePackageName: String) {
                     is UtPrimitiveModel,
                     is UtClassRefModel,
                     is UtVoidModel,
-                    is UtEnumConstantModel,
-                    is UtLambdaModel -> utModel
+                    is UtEnumConstantModel -> utModel
+                    is UtLambdaModel -> assembleLambdaModel(utModel)
                     is UtArrayModel -> assembleArrayModel(utModel)
                     is UtCompositeModel -> assembleCompositeModel(utModel)
                     is UtAssembleModel -> assembleAssembleModel(utModel)
@@ -204,6 +204,18 @@ class AssembleModelGenerator(private val basePackageName: String) {
         return assembledModel
     }
 
+    private fun assembleLambdaModel(lambdaModel: UtLambdaModel): UtModel {
+        instantiatedModels[lambdaModel]?.let { return it }
+
+        return UtLambdaModel(
+            lambdaModel.id,
+            lambdaModel.samType,
+            lambdaModel.declaringClass,
+            lambdaModel.lambdaName,
+            capturedValues = lambdaModel.capturedValues.map { assembleModel(it) }.toMutableList(),
+        )
+    }
+
     /**
      * Assembles internal structure of [UtArrayModel].
      */