DeepEquals: generate absent assertion

utbot-framework/src/main/kotlin/org/utbot/framework/codegen/model/constructor/tree/CgMethodConstructor.kt

@@ -839,6 +839,7 @@ internal class CgMethodConstructor(val context: CgContext) : CgContextOwner by c
 
         // if model is already processed, so we don't want to add new statements
         if (fieldModel in visitedModels) {
+            currentBlock += testFrameworkManager.getDeepEqualsAssertion(expected, actual).toStatement()
             return
         }
 

utbot-framework/src/test/kotlin/org/utbot/examples/codegen/deepequals/ClassWithCrossReferenceRelationshipTest.kt

@@ -0,0 +1,29 @@
+package org.utbot.examples.codegen.deepequals
+
+import org.junit.jupiter.api.Disabled
+import org.junit.jupiter.api.Test
+import org.utbot.examples.DoNotCalculate
+import org.utbot.examples.UtValueTestCaseChecker
+import org.utbot.examples.eq
+import org.utbot.framework.codegen.CodeGeneration
+import org.utbot.framework.plugin.api.CodegenLanguage
+
+class ClassWithCrossReferenceRelationshipTest : UtValueTestCaseChecker(
+    testClass = ClassWithCrossReferenceRelationship::class,
+    testCodeGeneration = true,
+    languagePipelines = listOf(
+        CodeGenerationLanguageLastStage(CodegenLanguage.JAVA),
+        CodeGenerationLanguageLastStage(CodegenLanguage.KOTLIN, CodeGeneration)
+    )
+) {
+    // TODO: The test is disabled due to [https://github.com/UnitTestBot/UTBotJava/issues/812]
+    @Disabled
+    @Test
+    fun testClassWithCrossReferenceRelationship() {
+        check(
+            ClassWithCrossReferenceRelationship::returnFirstClass,
+            eq(2),
+            coverage = DoNotCalculate
+        )
+    }
+}

utbot-framework/src/test/kotlin/org/utbot/examples/codegen/deepequals/ClassWithNullableFieldTest.kt

@@ -16,7 +16,7 @@ class ClassWithNullableFieldTest : UtValueTestCaseChecker(
     )
 ) {
     @Test
-    fun testClassWithNullableField() {
+    fun testClassWithNullableFieldInCompound() {
         check(
             ClassWithNullableField::returnCompoundWithNullableField,
             eq(2),
@@ -25,7 +25,7 @@ class ClassWithNullableFieldTest : UtValueTestCaseChecker(
     }
 
     @Test
-    fun testClassWithNullableField1() {
+    fun testClassWithNullableFieldInGreatCompound() {
         check(
             ClassWithNullableField::returnGreatCompoundWithNullableField,
             eq(3),

utbot-sample/src/main/java/org/utbot/examples/codegen/deepequals/ClassWithCrossReferenceRelationship.java

@@ -0,0 +1,30 @@
+package org.utbot.examples.codegen.deepequals;
+
+class FirstClass {
+    SecondClass secondClass;
+
+    FirstClass(SecondClass second) {
+        this.secondClass = second;
+    }
+}
+
+class SecondClass {
+    FirstClass firstClass;
+
+    SecondClass(FirstClass first) {
+        this.firstClass = first;
+    }
+}
+
+public class ClassWithCrossReferenceRelationship {
+    public FirstClass returnFirstClass(int value) {
+        if (value == 0) {
+            return new FirstClass(new SecondClass(null));
+        } else {
+            FirstClass first = new FirstClass(null);
+            first.secondClass = new SecondClass(first);
+
+            return first;
+        }
+    }
+}