HTTP-JMS Integration Unit Testing

Introduction To The API Under Test

Suppose you have a Data Ingestion API that exposes an HTTP endpoint. When a client invokes it with data, it delivers the data, unchanged, to a JMS (Solace) queue.

Test Isolation

Use Stub Queue Endpoint

To integration unit test the Data Ingestion API, design the API to point to different dependencies in different environments. This is normally achieved by setting different dependency endpoint addresses in different property files. Each property file contains all properties for the API for a specific environment like Dev/Test/QA/Prod. When deploying and running the API, dynamically load the property file for that specific environment.

In an integration unit testing environment like the Dev environment (which is typically a developer’s local machine), a property file like data-ingestion-api-dev.properties is used for the Data Ingestion API. The property file contains something like below

    jms.solace.jndi.provider.url=smf://localhost:55555
    jms.solace.connection.factory.jndi.name=JNDI/CF/default
    jms.solace.vpn=default
    jms.solace.queue.jndi.name=/jndi/q/data/ingestion/api/stub/out

Here the JMS properties are of a local JMS (Solace) stub queue. We use a local dedicated stub queue, instead of any fully implemented and shared JMS (Solace) queue like one in the SIT environment, as the dependency during integration unit testing, like shown below.

Create Stub Queue

To create the stub queue, you can simply do it via the Solace web console.

• Create a physical queue, like q/data/ingestion/api/stub/out. Use default settings for simplicity.
• And then create the JNDI queue /jndi/q/data/ingestion/api/stub/out which is effectively an alias, and associate it with the physical queue.

Test Case Creation

It is recommended that you have a look at Quick Start if ATB is new to you.

Create a test case Positive under a folder for the Data Ingestion API, with below test steps

    1. (JMS step) Setup - clear stub output queue
    2. (HTTP step) Invoke the API to ingest data
    3. (Wait step) Wait for 0.5 seconds
    4. (JMS step) Check stub output queue depth equals 1
    5. (JMS step) Browse the stub output queue and assert message body   

Step 3 might be optional depending on the Data Ingestion API’s implementation. It is needed when the implementation is of asynchronous style, i.e. the API returns no matter whether the JMS message delivery is acknowledged.

Run the test case by clicking the Run button, and check the test report.

Sample Test Case

The test case created above is available for download at sample test case. After download, right click anywhere in the left side pane on ATB UI, and select Import Test Case to import it.

What is Integration Unit Testing?

Refer to this post.