JUnit Tutorial i
JUnit Tutorial
JUnit Tutorial ii
Contents
1 Unit testing introduction 1
1.1 What is unit testing? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Test coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Unit testing in Java . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 JUnit introduction 2
2.1 JUnit Simple Example using Eclipse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.2 JUnit annotations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 JUnit assertions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 JUnit complete example using Eclipse 9
3.1 Initial Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Create the java class to be tested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Create and run a JUnit test case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4 Using @Ignore annotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.5 Creating suite tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.6 Creating parameterized tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.7 Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.8 Categories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4 Run JUnit tests from command line 24
5 Conclusions 26
JUnit Tutorial iii
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JUnit Tutorial iv
Preface
We have provided plenty of JUnit [1] tutorials here at Java Code Geeks, like JUnit Getting Started Example [2], JUnit Using
Assertions and Annotations Example [3], JUnit Annotations Example [4] and so on.
However, we prefered to gather all the JUnit features in one detailed guide for the convenience of the reader.
We hope you like it!
References:
[1] http://junit.org/
[2] http://examples.javacodegeeks.com/core-java/junit/junit-getting-started-example/
[3] http://examples.javacodegeeks.com/core-java/junit/junit-using-assertions-and-annotations-example/
[4] http://examples.javacodegeeks.com/core-java/junit/junit-annotations-example/
