JUNIT JUnit ( http://www.junit.org ) is a framework for writing - - PowerPoint PPT Presentation

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Nov 24, 2023 448 likes •528 views

JUNIT JUnit ( http://www.junit.org ) is a framework for writing tests in Java, written by Erich Gamma (of Design Patterns fame) and Kent Beck (creator of Extreme Programming methodology). It has become the unofcial standard for Java testing

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JUNIT

JUnit ( ) is a framework for writing tests in Java, written by Erich Gamma (of Design Patterns fame) and Kent Beck (creator of Extreme Programming methodology).

It has become the unofcial standard for Java testing Supported by many IDEs Widely imitated: C++, Perl, Python, .NET all have versions Once you know one, you can easily use others

http://www.junit.org

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USING JUNIT

JUnit uses reection to look up methods

Reection: extracting characteristics of a class or method at run time.

Pass in the class containing your tests JUnit decides which methods to run based on their annotations

An annotation is syntactically like a type.

If a method is annotated with “@Test”, TestRunner will execute it

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JUNIT STRUCTURE

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EXECUTION FLOW

Each method in a Unit Test can be labelled with @Before, @Test, @After

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Each Unit Test has many test cases, and for each test case:

@Before: The setup phase is in a (single) method annotated with @Before. Here, you do some setup/prep work before running the tests, e.g., open a le, open a network connection. @Test: Run the test case. @After: The teardown phase is in a single method annotated with @After. Here, you clean up after each test nishes, e.g., closing the le, close the connection. Methods annotated with @BeforeClass and @AfterClass run once overall.

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FYI

It’s BTA, BTA, BTA, ... , not BTTTTTTTA. That is, these run before and after every test case.

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JUNIT JUnit ( http://www.junit.org ) is a framework for writing - - PowerPoint PPT Presentation

JUNIT

JUnit ( ) is a framework for writing tests in Java, written by Erich Gamma (of Design Patterns fame) and Kent Beck (creator of Extreme Programming methodology).

It has become the unofcial standard for Java testing Supported by many IDEs Widely imitated: C++, Perl, Python, .NET all have versions Once you know one, you can easily use others

http://www.junit.org

USING JUNIT

JUnit uses reection to look up methods

Pass in the class containing your tests JUnit decides which methods to run based on their annotations

If a method is annotated with “@Test”, TestRunner will execute it

JUNIT STRUCTURE

EXECUTION FLOW

Each method in a Unit Test can be labelled with @Before, @Test, @After

Each Unit Test has many test cases, and for each test case:

FYI

It’s BTA, BTA, BTA, ... , not BTTTTTTTA. That is, these run before and after every test case.

DEMO TIME

Demo of JUnit with Eclipse:

https://www.youtube.com/watch?v=I8XXfgF9GSc