MUnit is a testing framework for Mulesoft that allows automated testing of mule integrations and APIs. It has many features like creating tests via Mule or Java code, mocking processors and endpoints, debugging tests, and viewing coverage reports. Tests are created by right clicking a flow and selecting "Create new MUnit". To run tests, right click the MUnit test flow and select "Run MUnit suite" which will display the results.

1. MUnit Testing With Mulesoft-Part I

2. MUnit Testing With Mulesoft
MUnit is a mule application testing framework which allows you to build
automated tests for your mule integrations and API's. MUnit is very well
integrated with Anypoint Studio.
Various features available with Mule MUnit
 Create and build Mule tests by writing Mule code.
 Create and build Mule tests by writing Java code.
 Verify Message Processor calls.
 Mock Message Processor.
 Mock outbound endpoints.
 Disable outbound endpoints.
 Disable flow inbound connectors.

3. MUnit Testing With Mulesoft
 Disable inbound endpoints.
 Debug the tests.
 View coverage reports.
 Various asserts available like Assert Equals, Assert Not Equals, Assert
Payload, Assert False, Assert True, Assert Null Payload, Assert Not Null
Payload.
 Spy Message Processor.

4. MUnit Testing With Mulesoft
First thing you want to make sure MUnit is installed in your Anypoint Studio.
In case, if it is not installed then follow below steps.
Go to Help < Install New Software...

5. MUnit Testing With Mulesoft
Now, it will open new pop up windows and select MUnit Update Site from
drop down list. Check MUnit and MUnit Tools for Mule.

6. MUnit Testing With Mulesoft
Now, it will open new pop up windows and select MUnit Update Site from
drop down list. Check MUnit and MUnit Tools for Mule.
Finally, just click Next and accept the license terms and conditions. Click
Finish and it will install MUnit tools in your Anypoint studio.

7. How to create the MUnit tests for
Mule Flow?
For creating MUnit tests for your application, right click on the flow select
MUnit < Create new MUnit.

8. How to create the MUnit tests for
Mule Flow?
It will create MUnit tests for the flow and it will be available in folder
src/test/unit.
In Assert Payload, you need to define Expected value and in this case it
will be payload. Also, provide Test failure message , in case if value doesn't
message expected value then it will provide failure message you have
defined.

9. Run MUnit Tests
For running the MUnit tests, right click in the canvas region of the MUnit test
flow and select Run MUnit suite.

10. Run MUnit Tests
After running the MUnit suite, it will be provide details like errors, failures if
any, coverage report and test status.
In above image, green color means that your test case has been
successfully executed and passed.

11. Thank You.