Mock API KIT: Router and Write Munit Test Cases for Different Error Types

This article is a tutorial for writing Munit Test cases in order to meet the required coverage threshold for different error types.

Abhishek Bathwal

Jan. 16, 21 · Tutorial

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Whenever we write Munit Test cases for any flow, coverage is one of the very important components which we have to take care of. But, due to error handling, it's become difficult to get the required coverage.

But, to meet the coverage threshold we have two options:

Ignore the Error Handling flow.
Write test cases for Error handling.

Note: The blog will have a detailed descriptive solution for writing the test cases for Error Handling.

Ignoring the Error Handling flow:

For ignoring a flow, we can use the ignore plugins in the POM. So, when we execute the Munit, the particular flow will be ignored and we get a better coverage report.

<groupId>com.mulesoft.munit.tools</groupId>

<artifactId>munit-maven-plugin</artifactId>

...

</ignoreFlows>

</coverage>

...

</configuration>

</plugin>

</plugins>

But, the Munit Studio has a limitation with this. The Munit Coverage report does not reflect this in the report. To get the exact coverage percentage, please follow the report from the Console.

Or, Execute the test cases from the Command prompt.

Script for cmd execution:

mvn test or mvn clean test or mvn test -X

Writing test cases for Error handling:

We have a simple flow with one resource and one error handling block as API KIT:BAD_REQUEST.

The Transform Message of the AKIKIT:BAD_REQUEST contains a payload with a message and Variable with HTTP status. (We can have any custom message in the payload as per requirement).

Now, we will write a test case for the main flow, which contains the error propagate block.

It Contains a Mock component as Behavior, a Flow reference as Execution step, and an Assert Equal component in Validation.

The Flow Reference will refer to the main flow below:

Next, we are going to configure the mock where we will Mock the API KIT router and define the Error Typeid in the Error tab. Also, in the suite flow configuration, we need to define the Expected error type. These two steps are very important as on the basis of this only the test case for error propagate will work.

Mock Component:

Flow Configuration:

For Assert That, the assertion can be on the basis of payload or httpStatus code. It completely depends on the user. For our application, we selected HTTP status for validating.

As all the configurations are done and we have set up the test flow, we will execute the test case.

Console Result:

= Tests run: 1 - Failed: 0 - Errors: 0 - Skipped: 0 - Time elapsed: 0.18 sec

Munit Studio Result:

Munit Coverage Report:

Note: As we have not written any test case for the post:\demo resource flow and only for Main flow, so the coverage for demo resource flow is 0% and for Main Flow is 100%.

Once the test case is executed, the part which comes under the success test execution is marked with a green check. This indicates that the test cases for those components are done successfully.

In a similar way, we can write test cases for other Error Types as well.

Sample Munit Code:

<?xml version="1.0" encoding="UTF-8"?>

<mule

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:munit="http://www.mulesoft.org/schema/mule/munit"

xmlns:munit-tools="http://www.mulesoft.org/schema/mule/munit-tools"

xmlns="http://www.mulesoft.org/schema/mule/core"

xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"

xsi:schemaLocation="

http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd

http://www.mulesoft.org/schema/mule/munit http://www.mulesoft.org/schema/mule/munit/current/mule-munit.xsd

http://www.mulesoft.org/schema/mule/munit-tools http://www.mulesoft.org/schema/mule/munit-tools/current/mule-munit-tools.xsd">

<munit:config name="demo-test-suite.xml" />

<munit:test name="demo-test-suite-demo-main-BAD_REQUEST-Test" doc:id="8b6ba2d1-4696-43de-a07b-d854f4e5e2b6" description="Test" expectedErrorType="APIKIT:BAD_REQUEST">

<munit:behavior >

<munit-tools:mock-when doc:name="Mock when APIKIT:BAD_REQUEST" doc:id="6e68f7aa-75bf-4f15-93be-0c451375e9d9" processor="apikit:router">

<munit-tools:with-attributes >

<munit-tools:with-attribute whereValue="demo-config" attributeName="config-ref" />

</munit-tools:with-attributes>

<munit-tools:then-return >

<munit-tools:error typeId="APIKIT:BAD_REQUEST" />

</munit-tools:then-return>

</munit-tools:mock-when>

</munit:behavior>

<munit:execution >

<flow-ref doc:name="Flow-ref to demo-main" doc:id="9df72122-506f-4759-aa24-134f8341b782" name="demo-main"/>

</munit:execution>

<munit:validation >

<munit-tools:assert-equals doc:name="Assert equals" doc:id="93698feb-de93-40b2-bc11-44739ad55c00" actual="#[vars.httpStatus]" expected="#[400]"/>

</munit:validation>

</munit:test>

<munit:test name="demo-test-suite-demo-main-NOT_FOUND-Test" doc:id="8cfe733b-449f-4df1-b09d-06d79f63d8fb" description="Test" expectedErrorType="APIKIT:NOT_FOUND">

<munit:behavior >

<munit-tools:mock-when doc:name="Mock when APIKIT:NOT_FOUND" doc:id="ff561c10-4a97-456a-af92-29c144363d3d" processor="apikit:router">

<munit-tools:with-attributes >

<munit-tools:with-attribute whereValue="demo-config" attributeName="config-ref" />

</munit-tools:with-attributes>

<munit-tools:then-return >

<munit-tools:error typeId="APIKIT:NOT_FOUND" />

</munit-tools:then-return>

</munit-tools:mock-when>

</munit:behavior>

<munit:execution >

<flow-ref doc:name="Flow Reference" doc:id="5079c1a2-74ff-4591-ac6d-840b8b15e78a" name="demo-main"/>

</munit:execution>

<munit:validation >

<munit-tools:assert-equals doc:name="Assert equals" doc:id="596dd171-6c28-415b-8a9d-8b9152f62cb4" actual="#[vars.httpStatus]" expected="#[404]"/>

</munit:validation>

</munit:test>

<munit:test name="demo-test-suite-demo-main-METHOD_NOT_ALLOWED-Test" doc:id="635ace96-1503-40ce-8de3-13e7411726c8" description="Test" expectedErrorType="APIKIT:METHOD_NOT_ALLOWED">

<munit:behavior >

<munit-tools:mock-when doc:name="Mock when APIKIT:METHOD_NOT_ALLOWED" doc:id="894571a7-42b9-4caf-9be4-3c16d9cfa0f6" processor="apikit:router">

<munit-tools:with-attributes >

<munit-tools:with-attribute whereValue="demo-config" attributeName="config-ref" />

</munit-tools:with-attributes>

<munit-tools:then-return >

<munit-tools:error typeId="APIKIT:METHOD_NOT_ALLOWED" />

</munit-tools:then-return>

</munit-tools:mock-when>

</munit:behavior>

<munit:execution >

<flow-ref doc:name="Flow-ref to demo-main" doc:id="b57e4856-e333-4b45-bb01-c234f8e5e9f9" name="demo-main"/>

</munit:execution>

<munit:validation >

<munit-tools:assert-equals doc:name="Assert equals" doc:id="493307c6-825b-4652-a61e-2973332a972f" actual="#[vars.httpStatus]" expected="#[405]"/>

</munit:validation>

</munit:test>

<munit:test name="demo-test-suite-demo-main-NOT_ACCEPTABLE-Test" doc:id="1bec6f0d-01ed-43b2-bf39-8736cbf5e590" description="Test" expectedErrorType="APIKIT:NOT_ACCEPTABLE">

<munit:behavior >

<munit-tools:mock-when doc:name="Mock when APIKIT:NOT_ACCEPTABLE" doc:id="3a329baf-99df-49fb-8b18-636dc5316973" processor="apikit:router">

<munit-tools:with-attributes >

<munit-tools:with-attribute whereValue="demo-config" attributeName="config-ref" />

</munit-tools:with-attributes>

<munit-tools:then-return >

<munit-tools:error typeId="APIKIT:NOT_ACCEPTABLE" />

</munit-tools:then-return>

</munit-tools:mock-when>

</munit:behavior>

<munit:execution >

<flow-ref doc:name="Flow Reference" doc:id="a46ee38a-13b0-431d-ab94-6fafa8492ee2" name="demo-main"/>

</munit:execution>

<munit:validation >

<munit-tools:assert-equals doc:name="Assert equals" doc:id="35aff4f1-30e8-4cda-b71e-736d0b279a98" actual="#[vars.httpStatus]" expected="#[406]"/>

</munit:validation>

</munit:test>

<munit:test name="demo-test-suite-demo-main-UNSUPPORTED_MEDIA_TYPE-Test" doc:id="d8454189-e4e1-4375-b585-0a999a837619" description="Test" expectedErrorType="APIKIT:UNSUPPORTED_MEDIA_TYPE">

<munit:behavior >

<munit-tools:mock-when doc:name="Mock when APIKIT:UNSUPPORTED_MEDIA_TYPE" doc:id="f41c89d8-b712-47a4-b358-ef8cb3ba086c" processor="apikit:router">

<munit-tools:with-attributes >

<munit-tools:with-attribute whereValue="demo-config" attributeName="config-ref" />

</munit-tools:with-attributes>

<munit-tools:then-return >

<munit-tools:error typeId="APIKIT:UNSUPPORTED_MEDIA_TYPE" />

</munit-tools:then-return>

</munit-tools:mock-when>

</munit:behavior>

<munit:execution >

<flow-ref doc:name="Flow-ref to demo-main" doc:id="92675038-645a-4a98-b897-06845a04e6e3" name="demo-main"/>

</munit:execution>

<munit:validation >

<munit-tools:assert-equals doc:name="Assert equals" doc:id="5065fd21-8f7f-4d1f-a6d5-042f40aefbfd" actual="#[vars.httpStatus]" expected="#[415]"/>

</munit:validation>

</munit:test>

<munit:test name="demo-test-suite-demo-main-NOT_IMPLEMENTED-Test" doc:id="e2cbf56e-ee66-41cc-82be-333dd1eb292c" description="Test" expectedErrorType="APIKIT:NOT_IMPLEMENTED">

<munit:behavior >

<munit-tools:mock-when doc:name="Mock when APIKIT:NOT_IMPLEMENTED" doc:id="aeb6b8f2-7488-4608-b591-ee22331b85f0" processor="apikit:router">

<munit-tools:with-attributes >

<munit-tools:with-attribute whereValue="demo-config" attributeName="config-ref" />

</munit-tools:with-attributes>

<munit-tools:then-return >

<munit-tools:error typeId="APIKIT:NOT_IMPLEMENTED" />

</munit-tools:then-return>

</munit-tools:mock-when>

</munit:behavior>

<munit:execution >

<flow-ref doc:name="Flow-ref to demo-main" doc:id="bd189bb8-d517-448c-bcdf-fe043190d0a0" name="demo-main"/>

</munit:execution>

<munit:validation >

<munit-tools:assert-equals doc:name="Assert equals" doc:id="302886a9-6dc6-4c96-920f-0d6f4100aa9c" actual="#[vars.httpStatus]" expected="#[501]"/>

</munit:validation>

</munit:test>

</mule>

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Mock API KIT: Router and Write Munit Test Cases for Different Error Types

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