FluM - Fluent Mock Web Server

A wrapper around the okhttp mockwebserver that adds a more fluent api for scripting the mock server. The design goal has been to allow an api for defining expected requests and corresponding responses that gives fluent and easy to read code. A major point is that the api allows defining the expected request, the corresponding response, and verification to do on the received request at the end of the test, all at the same point.

This is a work in progress, the available features, although they should cover most cases, are based on what has been needed for the authors. Suggestions on features to add are much welcome, see CONTRIBUTING

Project is built in Kotlin. Compatible with java 11.

Junit 5.5 or newer is needed to use the junit5 extension.

Jar is available from jcenter. Use in gradle like below.

compile 'se.svt.oss:flum:x.y.z'

TODO

• Verification of binary body

Dependencies

Kotlin

Basic Usage

class ExampleTest {

    val flum = Flum().apply {
        start()
    }

    @AfterEach
    fun tearDown() {
        try {
            flum.verify()
        } finally {
            flum.shutdown()
        }
    }

    @Test
    fun testUsingFlum() {
        flum.expectGet("test request 1")
                .toPath("/myService")
                .thenRespond()
                .withStatus(200)
                .withBody("SUCCESS")
                .afterwardsVerifyRequest()
                .hasQueryParameter("myParam", "myValue")

        flum.expectPost("test request 2")
                .toPath("/myService")
                .thenRespond()
                .withStatus(202)
                .withBody("ALSO SUCCESS")
                .afterwardsVerifyRequest()
                .hasBody("Hello World!")
        
        // CALL PRODUCTION CODE THAT IS SUPPOSED TO EXECUTE THE EXPECTED REQUEST
        
    }
}

Using with the junit5 extension

The FlumExtension will inject a Flum instance into any field of the correct type in the test instance. It will also provide a Flum instance to any test methods that takes a paramter of type Flum. It will also verify and shutdow flum after each test method.

Note that if your test is using LifeCycle PER_CLASS injecting flum into a field in the test instance is not supported, instead use a test method parameter.

The port that flum uses will be selected by the below methods, in falling order of priority

1. From port parameter passed into the FlumExtension constructor
2. From field or method in testinstance annotated with @FlumPort to determine the port
3. From method getFlumPort in testinstance
4. Random free port will be selected

@ExtendWith(value = [FlumExtension::class])
class ExampleTest {

    // Use the @FlumPort annotation to use specific port
    @FlumPort
    val flumPort = // Some custom logic to get port 

    // Flum will be injected here by extension
    lateinit var flum: Flum

    @Test
    fun testUsingFlum() {
        flum.expectGet("test request 1")
                .toPath("/myService")
                .thenRespond()
                .withStatus(200)
                .withBody("SUCCESS")
                .afterwardsVerifyRequest()
                .hasQueryParameter("myParam", "myValue")

        flum.expectPost("test request 2")
                .toPath("/myService")
                .thenRespond()
                .withStatus(202)
                .withBody("ALSO SUCCESS")
                .afterwardsVerifyRequest()
                .hasBody("Hello World!")
        
        // CALL PRODUCTION CODE THAT IS SUPPOSED TO EXECUTE THE EXPECTED REQUEST
        
    }
}

How to test the software

./gradlew test

Known issues

Getting help

If you have questions, concerns, bug reports, etc, please file an issue in this repository's Issue Tracker.

Getting involved

This project is very much a work in progress so all kinds of feedback are welcome, bug reports, feature requests etc are welcome. Details on how to contribute can be found in CONTRIBUTING.

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License

This software is released under the:

Apache License 2.0

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Primary Maintainer

Gustav Grusell

Credits and references

okhttp mockwebserver