Fixed UtLambdaModel caching

Author: Damtev

utbot-framework-api/src/main/kotlin/org/utbot/framework/plugin/api/Api.kt

@@ -569,6 +569,21 @@ class UtLambdaModel(
             ?: error("More than one method with name $lambdaName found in class: ${declaringClass.canonicalName}")
 
     override fun toString(): String = "Anonymous function $lambdaName implementing functional interface $declaringClass"
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as UtLambdaModel
+
+        if (id != other.id) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        return id ?: 0
+    }
 }
 
 /**

utbot-framework/src/main/kotlin/org/utbot/engine/Resolver.kt

@@ -662,12 +662,15 @@ class Resolver(
                 builder.toString()
             }
 
-        return UtLambdaModel(
+        val lambdaModel = UtLambdaModel(
             id = addr,
             samType = samType,
             declaringClass = declaringClass.id,
             lambdaName = lambdaName
         )
+        addConstructedModel(addr, lambdaModel)
+
+        return lambdaModel
     }
 
     private fun constructEnum(addr: Address, type: RefType, clazz: Class<*>): UtEnumConstantModel {