How can I execute a method once before all tests in all classes start?
I have a program that needs a system property to be set before any test start. Is there any way to do that?
Note: @BeforeClass or @Before are used just for the same test class. In my case, I'm looking for a way to execute a method before all test classes start.
if you need to run that method before the start of all test you should use the annotation @BeforeClass or if you need to execute the same method every time you will execute a test method of that class you must use @Before
f.e
@Before
public void executedBeforeEach() {
//this method will execute before every single test
}
@Test
public void EmptyCollection() {
assertTrue(testList.isEmpty());
}
To setup precondition to your test cases you can use something like this -
@Before
public void setUp(){
// Set up you preconditions here
// This piece of code will be executed before any of the test case execute
}
The test suite
@RunWith(Suite.class)
@Suite.SuiteClasses({ TestClass.class, Test2Class.class, })
public class TestSuite {
@BeforeClass
public static void setup() {
// the setup
}
}
and, the test classes
public class Test2Class {
@Test
public void test2() {
// some test
}
}
public class TestClass {
@Test
public void test() {
// some test
}
}
public class TestBase {
@BeforeClass
public static void setup() {
// setup
}
}
and, then the test classes can extend the base class
public class TestClass extends TestBase {
@Test
public void test() {
// some test
}
}
public class Test2Class extends TestBase {
@Test
public void test() {
// some test
}
}
However, this will call the setup method in TestBase for all its subclasses everytime each of them executes.
