tests: Add presence condition tests for node references

Author: rousso

src/test/java/eu/europa/ted/efx/sdk2/EfxExpressionTranslatorV2Test.java

@@ -65,6 +65,29 @@ void testPresenceCondition_WithNot() {
         "BT-00-Text is not present");
   }
 
+  @Test
+  void testPresenceCondition_WithNodeReference() {
+    testExpressionTranslationWithContext("SubNode", "ND-Root", "ND-SubNode is present");
+  }
+
+  @Test
+  void testPresenceCondition_WithNodeReference_WithNot() {
+    testExpressionTranslationWithContext("not(SubNode)", "ND-Root",
+        "ND-SubNode is not present");
+  }
+
+  @Test
+  void testPresenceCondition_WithAbsoluteNodeReference() {
+    testExpressionTranslationWithContext("/*/SubNode", "BT-00-Text",
+        "/ND-SubNode is present");
+  }
+
+  @Test
+  void testPresenceCondition_WithNodeReferenceWithPredicate() {
+    testExpressionTranslationWithContext("SubNode['a' = 'a']", "ND-Root",
+        "ND-SubNode['a' == 'a'] is present");
+  }
+
   @Test
   void testUniqueValueCondition() {
     testExpressionTranslationWithContext(