test: add missing test

Author: zambrovski

kafka/src/test/java/org/axonframework/extensions/kafka/eventhandling/HeaderUtilsTest.java

@@ -127,15 +127,25 @@ void testReadingValuesAsLongExistingKeyShouldReturnLong() {
         addHeader(headers, "negative", -4_8912_00_921_388_62621L);
 
         assertEquals(4_891_00_921_388_62621L, valueAsLong(headers, "positive"));
+        assertEquals(4_891_00_921_388_62621L, valueAsLong(headers, "positive", 42L));
         assertEquals(0, valueAsLong(headers, "zero"));
+        assertEquals(0, valueAsLong(headers, "zero", 42L));
         assertEquals(-4_8912_00_921_388_62621L, valueAsLong(headers, "negative"));
+
+        assertEquals(-4_8912_00_921_388_62621L, valueAsLong(headers, "negative", 42L));
+
     }
 
     @Test
     void testReadingValueAsLongNonExistingKeyShouldReturnNull() {
         assertNull(valueAsLong(new RecordHeaders(), "some-invalid-key"));
     }
 
+    @Test
+    void testReadingValueAsLongNonExistingKeyShouldReturnDefaultValue() {
+        assertEquals(42L, valueAsLong(new RecordHeaders(), "some-invalid-key", 42L));
+    }
+
     @Test
     void testWritingTimestampShouldBeWrittenAsLong() {
         RecordHeaders target = new RecordHeaders();