### Question:
FakeApi { public Boolean fakeOuterBooleanSerialize(Boolean body) throws RestClientException { return fakeOuterBooleanSerializeWithHttpInfo(body).getBody(); } FakeApi(); @Autowired  FakeApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); void createXmlItem(XmlItem xmlItem); ResponseEntity<Void> createXmlItemWithHttpInfo(XmlItem xmlItem); Boolean fakeOuterBooleanSerialize(Boolean body); ResponseEntity<Boolean> fakeOuterBooleanSerializeWithHttpInfo(Boolean body); OuterComposite fakeOuterCompositeSerialize(OuterComposite body); ResponseEntity<OuterComposite> fakeOuterCompositeSerializeWithHttpInfo(OuterComposite body); BigDecimal fakeOuterNumberSerialize(BigDecimal body); ResponseEntity<BigDecimal> fakeOuterNumberSerializeWithHttpInfo(BigDecimal body); String fakeOuterStringSerialize(String body); ResponseEntity<String> fakeOuterStringSerializeWithHttpInfo(String body); void testBodyWithFileSchema(FileSchemaTestClass body); ResponseEntity<Void> testBodyWithFileSchemaWithHttpInfo(FileSchemaTestClass body); void testBodyWithQueryParams(String query, User body); ResponseEntity<Void> testBodyWithQueryParamsWithHttpInfo(String query, User body); Client testClientModel(Client body); ResponseEntity<Client> testClientModelWithHttpInfo(Client body); void testEndpointParameters(BigDecimal number, Double _double, String patternWithoutDelimiter, byte[] _byte, Integer integer, Integer int32, Long int64, Float _float, String string, File binary, LocalDate date, OffsetDateTime dateTime, String password, String paramCallback); ResponseEntity<Void> testEndpointParametersWithHttpInfo(BigDecimal number, Double _double, String patternWithoutDelimiter, byte[] _byte, Integer integer, Integer int32, Long int64, Float _float, String string, File binary, LocalDate date, OffsetDateTime dateTime, String password, String paramCallback); void testEnumParameters(List<String> enumHeaderStringArray, String enumHeaderString, List<String> enumQueryStringArray, String enumQueryString, Integer enumQueryInteger, Double enumQueryDouble, List<String> enumFormStringArray, String enumFormString); ResponseEntity<Void> testEnumParametersWithHttpInfo(List<String> enumHeaderStringArray, String enumHeaderString, List<String> enumQueryStringArray, String enumQueryString, Integer enumQueryInteger, Double enumQueryDouble, List<String> enumFormStringArray, String enumFormString); void testGroupParameters(Integer requiredStringGroup, Boolean requiredBooleanGroup, Long requiredInt64Group, Integer stringGroup, Boolean booleanGroup, Long int64Group); ResponseEntity<Void> testGroupParametersWithHttpInfo(Integer requiredStringGroup, Boolean requiredBooleanGroup, Long requiredInt64Group, Integer stringGroup, Boolean booleanGroup, Long int64Group); void testInlineAdditionalProperties(Map<String, String> param); ResponseEntity<Void> testInlineAdditionalPropertiesWithHttpInfo(Map<String, String> param); void testJsonFormData(String param, String param2); ResponseEntity<Void> testJsonFormDataWithHttpInfo(String param, String param2); void testQueryParameterCollectionFormat(List<String> pipe, List<String> ioutil, List<String> http, List<String> url, List<String> context); ResponseEntity<Void> testQueryParameterCollectionFormatWithHttpInfo(List<String> pipe, List<String> ioutil, List<String> http, List<String> url, List<String> context);  }### Answer:
@Test public void fakeOuterBooleanSerializeTest() { Boolean body = null; Boolean response = api.fakeOuterBooleanSerialize(body); }