diff --git a/tests/unit/test_routing_manager.cpp b/tests/unit/test_routing_manager.cpp
index c5cbb5cda..decb1b8bb 100644
--- a/tests/unit/test_routing_manager.cpp
+++ b/tests/unit/test_routing_manager.cpp
@@ -1309,7 +1309,7 @@ void TestOmrSelection(void)
     //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
     SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().SetEnabled(false));
-    VerifyOrQuit(heapAllocations = sHeapAllocatedPtrs.GetLength());
+    VerifyOrQuit(heapAllocations == sHeapAllocatedPtrs.GetLength());
 
     Log("End of TestOmrSelection");
     FinalizeTest();
@@ -1474,7 +1474,7 @@ void TestDefaultRoute(void)
     //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
     SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().SetEnabled(false));
-    VerifyOrQuit(heapAllocations = sHeapAllocatedPtrs.GetLength());
+    VerifyOrQuit(heapAllocations == sHeapAllocatedPtrs.GetLength());
 
     Log("End of TestDefaultRoute");
 
@@ -1640,7 +1640,7 @@ void TestAdvNonUlaRoute(void)
     //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
     SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().SetEnabled(false));
-    VerifyOrQuit(heapAllocations = sHeapAllocatedPtrs.GetLength());
+    VerifyOrQuit(heapAllocations == sHeapAllocatedPtrs.GetLength());
 
     Log("End of TestAdvNonUlaRoute");
 
@@ -1779,7 +1779,7 @@ void TestLocalOnLinkPrefixDeprecation(void)
     //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
     SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().SetEnabled(false));
-    VerifyOrQuit(heapAllocations = sHeapAllocatedPtrs.GetLength());
+    VerifyOrQuit(heapAllocations == sHeapAllocatedPtrs.GetLength());
 
     Log("End of TestLocalOnLinkPrefixDeprecation");
 
@@ -1931,7 +1931,7 @@ void TestDomainPrefixAsOmr(void)
     //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
     SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().SetEnabled(false));
-    VerifyOrQuit(heapAllocations = sHeapAllocatedPtrs.GetLength());
+    VerifyOrQuit(heapAllocations == sHeapAllocatedPtrs.GetLength());
 
     Log("End of TestDomainPrefixAsOmr");
     FinalizeTest();
@@ -2440,7 +2440,7 @@ void TestExtPanIdChange(void)
     //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
     SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().SetEnabled(false));
-    VerifyOrQuit(heapAllocations = sHeapAllocatedPtrs.GetLength());
+    VerifyOrQuit(heapAllocations == sHeapAllocatedPtrs.GetLength());
 
     Log("End of TestExtPanIdChange");
     FinalizeTest();
@@ -2593,7 +2593,7 @@ void TestRouterNsProbe(void)
     //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
     SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().SetEnabled(false));
-    VerifyOrQuit(heapAllocations = sHeapAllocatedPtrs.GetLength());
+    VerifyOrQuit(heapAllocations == sHeapAllocatedPtrs.GetLength());
 
     Log("End of TestRouterNsProbe");
     FinalizeTest();
@@ -2812,7 +2812,7 @@ void TestConflictingPrefix(void)
     //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
     SuccessOrQuit(sInstance->Get<BorderRouter::RoutingManager>().SetEnabled(false));
-    VerifyOrQuit(heapAllocations = sHeapAllocatedPtrs.GetLength());
+    VerifyOrQuit(heapAllocations == sHeapAllocatedPtrs.GetLength());
 
     Log("End of TestConflictingPrefix");