diff --git a/tests/auto/corelib/tools/containerapisymmetry/tst_containerapisymmetry.cpp b/tests/auto/corelib/tools/containerapisymmetry/tst_containerapisymmetry.cpp
index 0237f60c3ca..29b229637e3 100644
--- a/tests/auto/corelib/tools/containerapisymmetry/tst_containerapisymmetry.cpp
+++ b/tests/auto/corelib/tools/containerapisymmetry/tst_containerapisymmetry.cpp
@@ -982,9 +982,23 @@ void tst_ContainerApiSymmetry::assign_impl() const
         QCOMPARE_EQ(c.capacity(), grownCapacity);
     }
     {
-        // range version for non input iterator
+        // range version for forward iterator
         auto c = make<Container>(4);
-        auto src = make<Container>(1);
+        auto src = std::forward_list<V>();
+
+        src.assign(8, tData);
+        RET_CHECK(c.assign(src.begin(), src.end())); // may reallocate
+        CHECK(c, tData, c.size(), S(8));
+
+        const S oldCapacity = c.capacity();
+        c.assign(src.begin(), src.begin());
+        CHECK(c, tData, c.size(), S(0));
+        QCOMPARE_EQ(c.capacity(), oldCapacity);
+    }
+    {
+        // range version for random-access iterator
+        auto c = make<Container>(4);
+        auto src = std::vector<V>();
 
         src.assign(8, tData);
         RET_CHECK(c.assign(src.begin(), src.end())); // may reallocate