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Server that builds a OpenAPI/JSON:API Swift test suite and runs it.

JSON:API/OpenAPI Test Server



The test server requires a Postgres database and Redis instace.


The test server and commandline tool will execute tests against an OpenAPI document. Out of box, you get errors for unprocessable OpenAPI documentation, warnings for certain unhandled types of APIs, and a test that every OpenAPI Example parses under the corresponding request/response body schema.

By default the server will assume that all request and response bodies are JSON:API compliant. The server will warn you and fall back to a non-JSON:API (but still JSON) request/response parsing mode if it fails to generate a test based on a JSON:API compliant schema. You can also opt out of attempting to interpret any particular OpenAPI Media Item as JSON:API with the x-not-json-api: true specification extension. This gets added to the OpenAPI document inside the Media Item but outside the schema.

For example,

    "content": {
        "application/json": {
            "x-not-json-api": true,
            "schema": {
                "type": "object"

You can additionally create tests that make API calls and verify that the actual responses from your server are parseable under the corresponding response schema. You do this with the x-tests Specification Extension on the OpenAPI Media Type Object within a Response Object (e.g. responses/'200'/content/'application/json'/x-tests). x-tests has the following structure:

    "test_name": {
        "test_host": "url",
        "skip_example": false,
        "ignore_missing_parameter_warnings": false,
        "parameters": {
            "path_param_name": "value",
            "header_param_name": "value"
        "query_parameters": [
                "name": "param_name",
                "value": "param_value"


  • test_host: optional, if omitted then default server for API will be used.
  • skip_example: optional, defaults to false.
  • ignore_missing_parameter_warnings: optional, defaults to false.
  • parameters values: Must be strings, even if the parameter type is Int or other.

The Commandline Tool

The command line tool's usage can be printed with --help and it is as follows:

OVERVIEW: Build and run tests based on an OpenAPI Document.

USAGE: APITest [--dump-files <directory path>] [--fail-hard] [--ignore-warnings] [--validate-all] [--openapi-file <file path>] [--override-server <url>] [--parser <parser>]

  --dump-files <directory path>
                          Dump produced test files in a zipped file at the specified location. 
        Tip: A good location to dump files is "./out". For the Dockerized tool this will be `/app/out` and when running the tool natively on your machine this will be the `out` folder relative to the current working directory.

        Not using this argument will result in test files being deleted after execution of the tests.
  -f, --fail-hard         Produce a non-zero exit code if any tests fail. 
  --ignore-warnings       Do not print warnings in the output. 
  --validate-all          Perform validation and linting on the OpenAPI documentation in addition to generating tests from it. 
  --openapi-file <file path>
                          Specify a filename from the local filesystem from which to read OpenAPI documentation. 
        Alternatively, set the `API_TEST_IN_FILE` environment variable.

        Either the environment variable or this argument must be used to indicate the OpenAPI file from which the tests should be generated.
  --override-server <url> Override the server definition(s) in the OpenAPI document for the purposes of this test run. 
        This argument allows you to make API requests against a different server than the input OpenAPI documentation specifies for this test run.

        Not using this argument will result in the API server options from the OpenAPI documentation being used.
  -p, --parser <parser>   Choose between the "stable" parser and a "fast" parser that is less battle-tested. (default: stable)
        This argument is currently only applicable to JSON parsing. When decoding a YAML file, the argument is ignored as there is only currently one YAML parser to choose from.

        Not using this argument will result in using the default stable parser.
  -h, --help              Show help information.

Against a URL

You can point the test tool at a URL serving up OpenAPI documentation. The URL can either require HTTP Basic Authentication or no authentication.

The unauthenticated version only requires the API_TEST_IN_URL environment variable.

docker run --rm --entrypoint ./APITest --env 'API_TEST_IN_URL=https://website.com/api/documentation' mattpolzin2/api-test-server

The authenticated version additionally requires the API_TEST_USERNAME and API_TEST_PASSWORD environment variables.

docker run --rm --entrypoint ./APITest --env 'API_TEST_IN_URL=https://website.com/api/documentation' --env 'API_TEST_USERNAME=username' --env 'API_TEST_PASSWORD=password' mattpolzin2/api-test-server ./APITest

Against a local file

You can point the test tool at a local file if you mount that file into the docker container and specify the mount destination with the API_TEST_IN_FILE environment variable or the --openapi-file option for the test command.

# command option
docker run --rm --entrypoint ./APITest -v '/full/path/to/openapi.json:/api/openapi.json' mattpolzin2/api-test-server --openapi-file /api/openapi.json

# ENV var
docker run --rm --entrypoint ./APITest --env 'API_TEST_IN_FILE=/api/openapi.json' -v '/full/path/to/openapi.json:/api/openapi.json' mattpolzin2/api-test-server

Note that you cannot use relative paths with bind mounts but if, for example, your openapi.json file is in the current working directory then you could invoke as:

docker run --rm --entrypoint ./APITest --env 'API_TEST_IN_FILE=/api/openapi.json' -v "$(pwd)/openapi.json:/api/openapi.json" mattpolzin2/api-test-server

API Host Override

You can specify an override test server URL if you want to make API test requests against a different URL than is specified by the OpenAPI documentation. You use the test command's --override-server option for this.

docker run --rm --entrypoint ./APITest -v '/full/path/to/openapi.json:/api/openapi.json' mattpolzin2/api-test-server --openapi-file /api/openapi.json --override-server https://test.server.com

Dumping test files

The test tool works by generating Swift code to parse examples and test responses. These test files include JSON:API models that could be used as a basis for client implementations. You can dump the test files with the --dump-files argument to the ./APITest test command. You must also mount the output directory (or don't remove the container and then docker cp later) so you can access the generated file from outside of the container.

docker run --rm --env 'API_TEST_IN_URL=https://website.com/api/documentation' -v "$(pwd)/out:/app/out" mattpolzin2/api-test-server ./APITest --dump-files /app/out

You will find the dumped files at /app/out/api_test_files.zip. TIP: You can also find the raw text logs from a test run at /app/out/api_test.log.

The Test Server

You can run an API Test server that accepts requests to run tests at HTTP endpoints. This requires the same input file or URL environment variables explained in the above section but you also must provide a Postgres database for the server to use as its persistence layer. You specify this database using a Postgres URL in the API_TEST_DATABASE_URL environment variable. A Redis instance is required to queue up the test runs. You specify the Redis URL in the API_TEST_REDIS_URL environment variable.

First you need to run the migrator against your Postgres database.

docker run --env 'API_TEST_IN_URL=https://website.com/api/documentation' --env 'API_TEST_DATABASE_URL=postgres://user:password@host:port/databasename' --env 'API_TEST_REDIS_URL=redis://host:port' -p '8080:80' mattpolzin2/api-test-server migrate --yes

Then you can start the server.

docker run --env 'API_TEST_IN_URL=https://website.com/api/documentation' --env 'API_TEST_DATABASE_URL=postgres://user:password@host:port/databasename' --env 'API_TEST_REDIS_URL=redis://host:port' -p '8080:80' mattpolzin2/api-test-server

Jobs Queue

Testing is run in a jobs queue. That queue can be run in the same process as the API server if you specify API_TEST_IN_PROCESS_QUEUES=true as an environment variable but the recommendation is to run the jobs service as its own process.

You start the Jobs Queue using the same docker image as the server but you specify the queues command.

docker run --env 'API_TEST_IN_URL=https://website.com/api/documentation' --env 'API_TEST_DATABASE_URL=postgres://user:password@host:port/databasename' --env 'API_TEST_REDIS_URL=redis://host:port' mattpolzin2/api-test-server queues

NOTE You must explicitly expose the port to the host device. In this example, http://localhost:8080 will point to the server which is listening on port 80 in the container.

Visit the /docs API endpoint to see what endpoints the server provides.


Note that Vapor 4 (and therefore this server) requires Swift 5.2.

Running and Testing

As of this writing, you need to run swift package generate-xcodeproj and then open that project in Xcode. Using Xcode's built-in Swift Package Manager support is currently broken for libraries like swift-syntax that require dynamic libraries from the Swift toolchain. swift build, swift test, etc. from the command line will work fine, though.

Generating API Documentation

To generate API documentation, run the GenAPIDocumenation target and save the output to Public/openapi.yml. This file is not committed to the repository but it will be picked up by the ReDoc UI served at the /docs API endpoint.

Documentation is generated as part of the Docker image build so you do not need to perform it as a separate step if you are building the Docker image anyway.

Building Docker Image

From the root folder of the repository, run

docker build -t api-test-server:latest .

Once done, you will have the api-test-server:latest Docker image.


Stars: 5
Last commit: 2 weeks ago


OneOf and multiline errors. - 2021-02-16T08:23:42

  • Add support for OneOf JSON Schema in more places, namely JSON:API attributes.
  • Add support for multiline error messages in console logs.