### Question:
RequestProviderService { public String getTppRolesAllowedHeader() { return getHeader(TPP_ROLES_ALLOWED_HEADER); }  Optional<Boolean> resolveTppRedirectPreferred(); RequestData getRequestData(); PsuIdData getPsuIdData(); @NotNull UUID getInternalRequestId(); @Nullable String getInstanceId(); String getInternalRequestIdString(); UUID getRequestId(); String getRequestIdString(); boolean isRequestFromPsu(); boolean isRequestFromTPP(); String getPsuIpAddress(); String getTppRedirectURI(); String getTppNokRedirectURI(); String getOAuth2Token(); String getTppRolesAllowedHeader(); @NotNull String getAcceptHeader(); String getContentTypeHeader(); String getEncodedTppQwacCert(); String getTppBrandLoggingInformationHeader(); Boolean getTppRejectionNoFundsPreferred();  }### Answer:
@Test void getTppRolesAllowedHeader() { when(httpServletRequest.getHeader(TPP_ROLES_ALLOWED_HEADER)).thenReturn(TPP_ROLES_ALLOWED_HEADER_VALUE); String tppRolesAllowedHeader = requestProviderService.getTppRolesAllowedHeader(); assertEquals(TPP_ROLES_ALLOWED_HEADER_VALUE, tppRolesAllowedHeader); }