small cleanup

Author: chiaramapellimt

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

@@ -113,7 +113,6 @@ private static Stream<Arguments> resourceFileParamsWithEnvironmentCategoryAndCon
     void setUp() {
         when(randomIdGeneratorService.createNewId()).thenReturn(TEST_ID);
         when(randomIdGeneratorService.createNewOrUseExistingUUID(anyString())).thenReturn(TEST_ID);
-        when(randomIdGeneratorService.createNewOrUseExistingUUID(anyString())).thenReturn(TEST_ID);
         when(confidentialityService.generateConfidentialityCode(any()))
             .thenReturn(Optional.empty());