diff --git a/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/domain/Domain.kt b/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/domain/Domain.kt
index d64f54c186..622c3eb534 100644
--- a/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/domain/Domain.kt
+++ b/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/domain/Domain.kt
@@ -190,6 +190,8 @@ abstract class TestFramework(
 
     open val testSuperClass: ClassId? = null
 
+    open val assertSame by lazy { assertionId("assertSame", objectClassId, objectClassId) }
+
     open val assertEquals by lazy { assertionId("assertEquals", objectClassId, objectClassId) }
 
     val assertFloatEquals by lazy { assertionId("assertEquals", floatClassId, floatClassId, floatClassId) }
diff --git a/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/services/framework/TestFrameworkManager.kt b/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/services/framework/TestFrameworkManager.kt
index 18c1068bdb..6294be3d2a 100644
--- a/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/services/framework/TestFrameworkManager.kt
+++ b/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/services/framework/TestFrameworkManager.kt
@@ -44,6 +44,8 @@ abstract class TestFrameworkManager(val context: CgContext)
 
     val assertions = context.testFramework.assertionsClass
 
+    val assertSame = context.testFramework.assertSame
+
     val assertEquals = context.testFramework.assertEquals
     val assertFloatEquals = context.testFramework.assertFloatEquals
     val assertDoubleEquals = context.testFramework.assertDoubleEquals
@@ -86,6 +88,10 @@ abstract class TestFrameworkManager(val context: CgContext)
         +assertions[assertEquals](expected, actual)
     }
 
+    open fun assertSame(expected: CgValue, actual: CgValue) {
+        +assertions[assertSame](expected, actual)
+    }
+
     open fun assertFloatEquals(expected: CgExpression, actual: CgExpression, delta: Any) {
         +assertions[assertFloatEquals](expected, actual, delta)
     }
diff --git a/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/tree/CgMethodConstructor.kt b/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/tree/CgMethodConstructor.kt
index 72d5a601e1..cc709f84ea 100644
--- a/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/tree/CgMethodConstructor.kt
+++ b/utbot-framework/src/main/kotlin/org/utbot/framework/codegen/tree/CgMethodConstructor.kt
@@ -115,6 +115,7 @@ import org.utbot.framework.plugin.api.UtSymbolicExecution
 import org.utbot.framework.plugin.api.UtTaintAnalysisFailure
 import org.utbot.framework.plugin.api.UtTimeoutException
 import org.utbot.framework.plugin.api.UtVoidModel
+import org.utbot.framework.plugin.api.isMockModel
 import org.utbot.framework.plugin.api.isNotNull
 import org.utbot.framework.plugin.api.isNull
 import org.utbot.framework.plugin.api.onFailure
@@ -618,6 +619,11 @@ open class CgMethodConstructor(val context: CgContext) : CgContextOwner by conte
         visitedModels += modelWithField
 
         with(testFrameworkManager) {
+            if (expectedModel.isMockModel()) {
+                currentBlock += assertions[assertSame](expected, actual).toStatement()
+                return
+            }
+
             if (depth >= DEEP_EQUALS_MAX_DEPTH) {
                 currentBlock += CgSingleLineComment("Current deep equals depth exceeds max depth $DEEP_EQUALS_MAX_DEPTH")
                 currentBlock += getDeepEqualsAssertion(expected, actual).toStatement()
diff --git a/utbot-js/src/main/kotlin/framework/codegen/model/constructor/tree/JsTestFrameworkManager.kt b/utbot-js/src/main/kotlin/framework/codegen/model/constructor/tree/JsTestFrameworkManager.kt
index f7490fd439..13466f194e 100644
--- a/utbot-js/src/main/kotlin/framework/codegen/model/constructor/tree/JsTestFrameworkManager.kt
+++ b/utbot-js/src/main/kotlin/framework/codegen/model/constructor/tree/JsTestFrameworkManager.kt
@@ -51,6 +51,10 @@ class MochaManager(context: CgContext) : TestFrameworkManager(context) {
         +assertions[jsAssertEquals](expected, actual)
     }
 
+    override fun assertSame(expected: CgValue, actual: CgValue) {
+        error("assertSame does not exist in Mocha")
+    }
+
     override fun disableTestMethod(reason: String) {
 
     }
diff --git a/utbot-python/src/main/kotlin/org/utbot/python/framework/codegen/model/constructor/tree/PythonTestFrameworkManager.kt b/utbot-python/src/main/kotlin/org/utbot/python/framework/codegen/model/constructor/tree/PythonTestFrameworkManager.kt
index 8726c9af13..cce442c13a 100644
--- a/utbot-python/src/main/kotlin/org/utbot/python/framework/codegen/model/constructor/tree/PythonTestFrameworkManager.kt
+++ b/utbot-python/src/main/kotlin/org/utbot/python/framework/codegen/model/constructor/tree/PythonTestFrameworkManager.kt
@@ -81,6 +81,10 @@ internal class PytestManager(context: CgContext) : TestFrameworkManager(context)
         )
     }
 
+    override fun assertSame(expected: CgValue, actual: CgValue) {
+        error("assertSame does not exist in PyTest")
+    }
+
     fun assertIsinstance(types: List<PythonClassId>, actual: CgVariable) {
         +CgPythonAssertEquals(
             CgPythonFunctionCall(
@@ -102,12 +106,16 @@ internal class UnittestManager(context: CgContext) : TestFrameworkManager(contex
     override val isExpectedExceptionExecutionBreaking: Boolean = true
 
     override val dataProviderMethodsHolder: TestClassContext
-        get() = error("Parametrized tests are not supported for JavaScript")
+        get() = error("Parametrized tests are not supported in Unittest")
 
     override fun addAnnotationForNestedClasses() {
         error("Nested classes annotation does not exist in Unittest")
     }
 
+    override fun assertSame(expected: CgValue, actual: CgValue) {
+        error("assertSame does not exist in Unittest")
+    }
+
     override fun expectException(exception: ClassId, block: () -> Unit) {
         require(testFramework is Unittest) { "According to settings, Unittest was expected, but got: $testFramework" }
         require(exception is PythonClassId) { "Exceptions must be PythonClassId" }