WebTau supports validation of responses against an https://www.openapis.org/ OpenAPI specification. This feature can be enabled by specifying the openApiSpecUrl configuration option. This should be the URL to the specification against which to validate. url = "http://localhost:8080" openApiSpecUrl = "scenarios/rest/springboot/api-spec.json"

OpenAPI specification support is still in its early stage. It is fully functional but there are a few limitations to be aware of:WebTau currently only supports OpenAPI specification v2 specification matching is currently done based on the path and method any HTTP requests which do not match any operation in the specification will not fail tests but will produce a warning on the console

The validation errors are reported in the same manner as assertion errors. They are available in the output from the command line WebTau runner: bash > executing HTTP POST http://localhost:8080/customers { "id": 1, "firstName": "FN", "lastName": "LN", "_links": { "self": { "href": "http://localhost:8080/customers/1" }, "customer": { "href": "http://localhost:8080/customers/1" } } } X failed executing HTTP POST http://localhost:8080/customers : API spec validation failure: ERROR - Response status 201 not defined for path ''.: [] [x] failed java.lang.AssertionError: API spec validation failure: ERROR - Response status 201 not defined for path ''.: [] at scenarios.rest.springboot.customerCrud$_run_closure1.doCall(customerCrud.groovy:8) at scenarios.rest.springboot.customerCrud$_run_closure1.doCall(customerCrud.groovy) Total: 1, Passed: 0, Skipped: 0, Failed: 1, Errored: 0 They are also available in the HTML report:

To ignore additional properties in responses set openApiIgnoreAdditionalProperties to true . As any other config value it can be done via command line, config file or system properties.

import org.testingisdocumenting.webtau.openapi.OpenApi OpenApi.withoutValidation { http.post("/employee", [firstName: 'First']) { // ... } } OpenApi.responseOnlyValidation() { http.post("/employee", [firstName: 'First']) { // ... } } OpenApi.requestOnlyValidation() { http.post("/employee", [firstName: 'First', lastName: 'Second']) { // ... } }