* Add test for the case where an extension is provided, but the extension is not defined by the url as a description extension.

Author: MartinWheelerMT

service/src/test/java/uk/nhs/adaptors/gp2gp/ehr/mapper/CodeableConceptCdMapperTest.java

@@ -575,6 +575,36 @@ void When_WithSnomedCodingNoTextNoDisplayWithDescriptionExtensionWithDisplayExte
 
             assertThat(outputMessage).isEqualToIgnoringWhitespace(expectedOutput);
         }
+
+        @Test
+        void When_WithSnomedCodingNoTextNoDisplayWithNonDescriptionExtension_Expect_SnomedCdXmlWithoutOriginalText() {
+            var inputJson = """
+                {
+                    "resourceType": "Observation",
+                    "code": {
+                        "coding": [
+                            {
+                                "system": "http://snomed.info/sct",
+                                "code": "852471000000107",
+                                "extension": [
+                                    {
+                                        "url": "https://fhir.nhs.uk/STU3/StructureDefinition/Extension-some-otherUrl"
+                                    }
+                                ]
+                            }
+                        ]
+                    }
+                }""";
+
+            var expectedOutput = """
+                <code nullFlavor="UNK">
+                </code>""";
+            var codeableConcept = fhirParseService.parseResource(inputJson, Observation.class).getCode();
+
+            var outputMessage = codeableConceptCdMapper.mapToNullFlavorCodeableConcept(codeableConcept);
+
+            assertThat(outputMessage).isEqualToIgnoringWhitespace(expectedOutput);
+        }
     }
 
     @ParameterizedTest