diff --git a/src/test/java/de/rub/nds/modifiablevariable/ModifiableVariableTest.java b/src/test/java/de/rub/nds/modifiablevariable/ModifiableVariableTest.java
index 90742316..a0446e5b 100644
--- a/src/test/java/de/rub/nds/modifiablevariable/ModifiableVariableTest.java
+++ b/src/test/java/de/rub/nds/modifiablevariable/ModifiableVariableTest.java
@@ -84,4 +84,89 @@ public void testCopyConstructorWithModifications() {
         assertEquals(150, original.getValue());
         assertEquals(300, copy.getValue());
     }
+
+    /** Test getModifications method. */
+    @Test
+    public void testGetModifications() {
+        ModifiableInteger integer = new ModifiableInteger();
+        integer.setOriginalValue(100);
+
+        // Initially no modifications
+        assertNull(integer.getModifications());
+
+        // Add modifications
+        IntegerAddModification addMod = new IntegerAddModification(50);
+        IntegerMultiplyModification multiplyMod = new IntegerMultiplyModification(2);
+        integer.addModification(addMod);
+        integer.addModification(multiplyMod);
+
+        // Get modifications
+        List<VariableModification<Integer>> mods = integer.getModifications();
+        assertNotNull(mods);
+        assertEquals(2, mods.size());
+        assertEquals(addMod, mods.get(0));
+        assertEquals(multiplyMod, mods.get(1));
+
+        // Clear modifications
+        integer.clearModifications();
+        assertNull(integer.getModifications());
+    }
+
+    /** Test containsAssertion method. */
+    @Test
+    public void testContainsAssertion() {
+        ModifiableInteger integer = new ModifiableInteger();
+
+        // Initially no assertion
+        assertFalse(integer.containsAssertion());
+
+        // Set assertEquals value
+        integer.setAssertEquals(150);
+        assertTrue(integer.containsAssertion());
+
+        // Create new instance without assertion
+        ModifiableInteger noAssertion = new ModifiableInteger();
+        assertFalse(noAssertion.containsAssertion());
+    }
+
+    /** Test innerToString method through subclass toString. */
+    @Test
+    public void testInnerToString() {
+        // Test with no modifications or assertions
+        ModifiableInteger integer1 = new ModifiableInteger();
+        integer1.setOriginalValue(100);
+        String str1 = integer1.toString();
+        assertTrue(str1.contains("originalValue=100"));
+        assertFalse(str1.contains("modifications="));
+        assertFalse(str1.contains("assertEquals="));
+
+        // Test with modifications
+        ModifiableInteger integer2 = new ModifiableInteger();
+        integer2.setOriginalValue(100);
+        integer2.addModification(new IntegerAddModification(50));
+        integer2.addModification(new IntegerMultiplyModification(2));
+        String str2 = integer2.toString();
+        assertTrue(str2.contains("originalValue=100"));
+        assertTrue(str2.contains("modifications=["));
+        assertTrue(str2.contains("IntegerAddModification"));
+        assertTrue(str2.contains("IntegerMultiplyModification"));
+
+        // Test with assertions
+        ModifiableInteger integer3 = new ModifiableInteger();
+        integer3.setOriginalValue(100);
+        integer3.setAssertEquals(150);
+        String str3 = integer3.toString();
+        assertTrue(str3.contains("originalValue=100"));
+        assertTrue(str3.contains("assertEquals=150"));
+
+        // Test with both modifications and assertions
+        ModifiableInteger integer4 = new ModifiableInteger();
+        integer4.setOriginalValue(100);
+        integer4.addModification(new IntegerAddModification(50));
+        integer4.setAssertEquals(150);
+        String str4 = integer4.toString();
+        assertTrue(str4.contains("originalValue=100"));
+        assertTrue(str4.contains("modifications=["));
+        assertTrue(str4.contains("assertEquals=150"));
+    }
 }