JUnit integration test example

JUnit is a great test framework. At most of the time is used for unit test. While it can also be used for integration test.

Unit Test

• is a software testing method
• test a piece of code
• methods as interfaces
• does not install the software being developed
• mocks can be used to isolate external dependencies

Integration Test

• is a software testing method
• test the software. The software is called SUT (System Under Test)
• the whole software is a black box
• the software usually need be installed
• mocks can be used to isolate external dependencies

A maven example project for integration test framework.

In this case, the project is a test project. All code are used for testing. While we can split the testing into two parts.

• integration test
• unit test the integration test

suporting function for integration test

Some functions will be needed to support intetration test. The following parts are most common functions needed for integration test.

• interface module which connect to the SUT (System Under Test), REST, WebService, SSH
• authentication in order to connect to the SUT.
• data collection

unit test the testing

All unit tests are located at directory src/test.

Surefire plugin has great support for unit test.

Default junit pattern for file are

• **/Test.java
• ***/*Test.java
• ***/*TestCase.java

Execute unit test with following command

	mvn test

In the example the following two test cases will be run

	class TestUnit1
	class TestUnit2

The report will be located at

	${basedir}/target/surefire-reports

Execute only specified class

    mvn test -Dtest=TestUnit1

Execute only specified method in a class

    mvn test -Dtest=TestUnit1#testUnit1Success

Execute with specified test class with regex

    mvn test -Dtest=TestUnit*

Execute with specified test class and method with regex

    mvn test -Dtest=TestUnit*#test*

Execute with multiple specified test class and method

    mvn test -Dtest=TestUnit1#testUnit1Fail,TestUnit2#unit2

Execute with multiple specified test class and method with regex

    mvn test -Dtest=TestUnit*#*Fail,TestUnit2*#test*

integration test

All integration test are located at directory src/test

Failsafe plugin has great support for integration test.

Default junit pattern for file are

• **/IT.java
• ***/*IT.java
• ***/*ITCase.java

Execute integration test with following command.

	mvn verify

Execute only integration test by ignore unit test with following command.

	mvn verify -Dskip.surefire.tests

In the example the following two test cases will be run

	class TestUnit1
	class TestUnit2

The report will be located at

	${basedir}/target/failsafe-reports

smoke integration

Default junit pattern for file are

• **/ITSmoke.java

Execute integration test with following command.

	mvn verify -P smoke

Execute only integration test by ignore unit test with following command.

	mvn verify -P smoke -Dskip.surefire.tests

nightly integration

Default junit pattern for file are

• **/ITNightly.java

Execute integration test with following command.

	mvn verify -P nightly

Execute only integration test by ignore unit test with following command.

	mvn verify -P nightly -Dskip.surefire.tests

weekly integration test

Default junit pattern for file are

• **/ITWeekly.java

Execute integration test with following command.

	mvn verify -P weekly

Execute only integration test by ignore unit test with following command.

	mvn verify -P weekly -Dskip.surefire.tests