MUnit - Introduction

MUnit
Introduction into
Automated Testing of Apps
In Anypoint Studio

Test my apps? Why would I?
Tests should be applied during each phase of the
software development process from
developer tests to acceptance tests.
In software engineering comprehensive and
automated test suits will secure the quality of
software and can provide a safety net for
regression and incompatibility changes.

The Testing Pyramid
Ideally testing of software projects is built bottom up.
Starting with a large test case base of automated unit
tests for the smallest components which make up the
whole application together.
Going up through architecture layers the number of test
cases decreases for larger components because they
are compositions of the already tested components.
Reaching finally the top of the pyramid where manual
supervision or manual tests make up the top of the
pyramid testing the application as a whole
*http://martinfowler.com/bliki/TestPyramid.html
*http://watirmelon.com/2012/01/31/introducing-the-software-
testing-ice-cream-cone/

Unit Tests
On the lowest level unit tests verify the
correct functionality of classes. These classes can be
in a Mule project simple extensions and
customizations of the Mule framework. Unit tests in
a classical sense can test the functionality of custom
classes without firing up Mule.
Single Unit
* https://blog.codecentric.de/en/2015/01/mule-esb-testing-part-13-unit-functional-testing/

Functional Tests
When it comes to testing the interaction of
components between each other in sub flows
or “simple” flows functional tests are the
recommended way of testing.
Single Unit Single UnitSingle Unit
* https://blog.codecentric.de/en/2015/01/mule-esb-testing-part-13-unit-functional-testing/

What is MUnit ?
MUnit is a Mule testing framework which allows
Mule developers to easily automate testing. It
is an open-source project, created originally as
a side project in Mule.
* https://developer.mulesoft.com/docs/display/current/MUnit

Munit will allow you to:
Create your Mule test by writing
Mule code.
Create your Mule test by writing
Java code.
Disable flow inbound endpoints.
Disable endpoint connectors.
Mock outbound endpoints.
Mock message processors.
Spy any message processor.
Verify message processor calls
Create not only unit tests but
also integration tests in a local
environment .
MUnit allows you to start a
local FTP/SFTP, DB server or mail
server.
Call the Mule client from Mule
code.
Assert flow exceptions.
Enable or disable particular
tests.
See assertion/error reports with
Mule stack trace.
Extend the MUnit framework
with plugins.
Check visual coverage in Studio.
Debug your tests with Studio.
* https://developer.mulesoft.com/docs/display/current/MUnit

Installing MUnit
To install MUnit, follow these steps:
Verify that your version of Studio is 5.2.0 (July 2015 release) or
above.
Add the MUnit update site:
http://studio.mulesoft.org/r4/munit
Go to Help -> Install New Software.
Studio displays the Available Software window. In the Work with:
field, paste the MUnit update site
Check Munit and Munit Tools for Mule.
Using MUnit automatically adds a new folder, src/test/munit, to
your project.
* https://developer.mulesoft.com/docs/display/current/Using+MUnit+in+Anypoint+Studio

Creating a New MUnit Test in Studio
MUnit Studio integration is mainly built around XML-
based tests. Most of the MUnit-Studio integration tools
guide you in the creation of these tests.
There are two basic ways to create a new MUnit test in
Studio:
1. Right-click a specific flow by right clicking the flow and
selecting MUnit
2. Use the wizard, which allows you to create a test for any
flow or application in the workspace
The most basic ones are by right-clicking the flow you
want to test, or by using the wizard.

Creating a Test for a Specific Flow
To create a test for a specific flow, right-click the flow, then
select:
MUnit -> Create a new <flow_name> suite
This Creates a new test suite named after the XML file
where the flow resides, in this case munit2.xml. Studio
displays the test suite on a new tab, next to the tab for the
original application, imports the XML file to the test suite
and creates a new MUnit test.
To add an MUnit message processor to the test as
described above, drag it from the Palette to the Test area
after the flow-ref.

This creates the following XML:
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesoft.org/schema/mule/core"
xmlns:munit="http://www.mulesoft.org/schema/mule/munit"
xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans"
xmlns:core="http://www.mulesoft.org/schema/mule/core" version="EE-3.7.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.mulesoft.org/schema/mule/munit
http://www.mulesoft.org/schema/mule/munit/current/mule-munit.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core
http://www.mulesoft.org/schema/mule/core/current/mule.xsd">
<munit:config name="munit" doc:name="MUnit configuration"/>
<spring:beans>
<spring:import resource="classpath:munit2.xml"/>
</spring:beans>
<munit:test name="munit2-test-suite-munit2FlowTest" description="Test">
<flow-ref name="munit2Flow" doc:name="Flow-ref to munit2Flow"/>
</munit:test>
</mule>

Creating a Test Via the Wizard
The wizard allows you to create a test for any flow or
application in your Studio workspace.
To create a test via the wizard, go to File -> New -> MUnit
Test. Now Studio displays the MUnit test creation wizard.
As you can see, the wizard allows you to select any of the
flows and applications in the workspace.
If you want to create a test that does not reference a
specific flow, click the Create empty test checkbox.

Configuring Your Test
Studio displays the newly-created test suite in
its own canvas. Here you can tailor your test
suite using the Studio interface, just like a
regular application.
The Studio Palette displays two new
sections: MUnit and MUnit Integration Test
Tools. To quickly see all MUnit message
processors, type munit in the Palette search
filter.

Running Your Test
Running a Test Suite
To run a test suite, right-click the empty canvas where the suite resides,
then select Run MUnit suite. Studio displays the output from the running
suite in the console.
Running a Test
To run a test, right-click the name of the test, then select Run MUnit
Test.
To check that the test is actually running, view the output in the
console. In order not to overwhelm the user, the default output
provides little information, but enough to verify that the test has
run.
An alternative way to run a test is to use the MUnit tab.
1. Select the desired test in the MUnit tab.
2. Right-click the test, then select Run.

Viewing Test Results
Studio displays MUnit test results in the MUnit tab of the left-hand explorer pane. The MUnit
tab displays successful tests in green, failed tests in red.
The Coverage button allows you to see what flow the test covered, and the percentage of
message processors in the flow that was covered by the test.
If you run more than one test, the MUnit tab displays a history of run tests. For failed tests,
the Errors button displays the stack trace, which you can copy to your clipboard. To copy the
stacktrace, right-click the name of the failed test, then select Copy Stack Trace.
As you can see in the image above, you can also use the MUnit tab to run or debug your test,
by selecting the appropriate menu option.
Clicking the debug button or the play button on the top right causes the last run or debug to
be re-run. This re-run includes all tests that were run on the previous run. You can also select
a single test from the previous run to re-run on its own.

Debugging Tests
You can debug MUnit tests just like Studio applications, using Studio's debugging perspective.
To access the debugging perspective, click Mule Debug on the top right of the Studio toolbar.
This takes you away from the default Mule Design perspective to the debugging perspective,
which displays debugging controls.
As with Mule applications, you can mark an MUnit message processor as a breakpoint, where
a debug run should stop to enable you to see the information that reaches the message
processor.
To debug a test, you can:
– Right-click the test in the canvas, then select Debug MUnit test.
– If you are working in the MUnit tab, you can select a test that previously ran, then click
the debug icon on the top right.
– Or right-click the desired test, then select Debug.

MUnit - Introduction

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