### Question:
FakeApi { public Boolean fakeOuterBooleanSerialize(Boolean body) throws ApiException { Object localVarPostBody = body; String localVarPath = "/fake/outer/boolean".replaceAll("\\{format\\}","json"); List<Pair> localVarQueryParams = new ArrayList<Pair>(); Map<String, String> localVarHeaderParams = new HashMap<String, String>(); Map<String, String> localVarCookieParams = new HashMap<String, String>(); Map<String, Object> localVarFormParams = new HashMap<String, Object>(); final String[] localVarAccepts = { "*/*" }; final String localVarAccept = apiClient.selectHeaderAccept(localVarAccepts); final String[] localVarContentTypes = { }; final String localVarContentType = apiClient.selectHeaderContentType(localVarContentTypes); String[] localVarAuthNames = new String[] { }; GenericType<Boolean> localVarReturnType = new GenericType<Boolean>() {}; return apiClient.invokeAPI(localVarPath, "POST", localVarQueryParams, localVarPostBody, localVarHeaderParams, localVarCookieParams, localVarFormParams, localVarAccept, localVarContentType, localVarAuthNames, localVarReturnType); } FakeApi();  FakeApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); void createXmlItem(XmlItem xmlItem); Boolean fakeOuterBooleanSerialize(Boolean body); OuterComposite fakeOuterCompositeSerialize(OuterComposite body); BigDecimal fakeOuterNumberSerialize(BigDecimal body); String fakeOuterStringSerialize(String body); void testBodyWithFileSchema(FileSchemaTestClass body); void testBodyWithQueryParams(String query, User body); Client testClientModel(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); void testEnumParameters(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); void testInlineAdditionalProperties(Map<String, String> param); void testJsonFormData(String param, String param2); void testQueryParameterCollectionFormat(List<String> pipe, List<String> ioutil, List<String> http, List<String> url, List<String> context);  }### Answer:
@Test public void fakeOuterBooleanSerializeTest() throws ApiException { Boolean body = null; Boolean response = api.fakeOuterBooleanSerialize(body); }