Exploring core JUnit - JUnit in Action - page 22

If you add another test to the CalculatorTest class, like testSubtract , and you
annotate it with the @Test , the default Suite would automatically include it.
The Suite object is a Runner that executes all of the @Test annotated methods
in the test class. Listing 2.3 shows how to compose multiple test classes in a single
test suite.

Listing 2.3 Composing a Suite from test classes

[...]
@RunWith(value=org.junit.runners.Suite. class )
@SuiteClasses(value={FolderConfigurationTest. class ,
FileConfigurationTest. class })
public class FileSystemConfigurationTestSuite {
}
In listing 2.3, we specify the appropriate runner with the @RunWith annotation B and
list the tests we want to include in this test by specifying the test classes in the @Suite-
Classes annotation C . All the @Test methods from these classes will be included in
the Suite .
For the CalculatorTest in listing 2.1, you can represent the default Suite like this:

B

C

@RunWith(value=Suite.class)
@SuiteClasses(value={CalculatorTest.class})
public class AllTests {
}

2.4.2 Composing a suite of suites

Because of the clever way JU nit is constructed, it's possible to create a suite of test
suites. For example, listing 2.4 concatenates various files to show how test cases make
up suites, which in turn make up a master suite.

Listing 2.4 Suite of suites

[...]
public class TestCaseA {
@Test
public void testA1() {
// omitted
}
}

[...]
public class TestCaseB {
@Test
public void testB1() {
// omitted
}
}

[...]
@RunWith(value=Suite .class )
@SuiteClasses(value = {TestCaseA .class })