@BeforeClass: Difference between revisions

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The annotation must be attached to a '''static''' method.
The annotation must be attached to a '''static''' method.


=<tt>@@BeforeClass</tt> and Class Hierarchies=
=<tt>@BeforeClass</tt> and Class Hierarchies=


If two methods '''with different names''' are annotated with <code>@BeforeClass</code> in a test class hierarchy, as shown below:
If two methods '''with different names''' are annotated with <code>@BeforeClass</code> in a test class hierarchy, as shown below:

Revision as of 01:58, 29 August 2021

Internal

Overview

The annotation must be attached to a static method.

@BeforeClass and Class Hierarchies

If two methods with different names are annotated with @BeforeClass in a test class hierarchy, as shown below:

TestBase.java
  │  @BeforeClass
  │  public static void testBaseOneTimeSetup() {
  │     ...
  │  }
  │
  └── SomeTest.java
        @BeforeClass
        public static void someTestOneTimeSetup() {
          ...
        }

then both methods are executed only once, in this order: first the parent class method (testBaseOneTimeSetup()), then the subclass method (someTestOneTimeSetup()). The rule holds true in a multi-layer hierarchy.

However, if both methods have the same name, an override of sorts takes place and only the method belonging to the subclass is executed:

TestBase.java
  │  @BeforeClass
  │  public static void oneTimeClassSetup() {
  │     ...
  │  }
  │
  └── SomeTest.java
        @BeforeClass
        public static void oneTimeClassSetup() {
          ...
        }

Only SomeTest.oneTimeClassSetup() is executed, so if you need the logic executed in superclass, it must be invoked explicitly with: <syntaxhighlight lang='java'> class SomeTest {

 @BeforeClass
 public static void oneTimeClassSetup() {
    TestBase.oneTimeClassSetup();
 }

} <syntaxhighlight lang='java'>