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@Retention(value=RUNTIME) @Target(value=FIELD) public @interface Rule
Annotates fields that contain rules. Such a field must be public, not
static, and a subtype of TestRule.
The Statement passed
to the TestRule will run any Before methods,
then the Test method, and finally any After methods,
throwing an exception if any of these fail. If there are multiple
annotated Rules on a class, they will be applied in an order
that depends on your JVM's implementation of the reflection API, which is
undefined, in general.
For example, here is a test class that creates a temporary folder before
each test method, and deletes it after each:
public static class HasTempFolder {
@Rule
public TemporaryFolder folder= new TemporaryFolder();
@Test
public void testUsingTempFolder() throws IOException {
File createdFile= folder.newFile("myfile.txt");
File createdFolder= folder.newFolder("subfolder");
// ...
}
}
For more information and more examples, see
TestRule.
Note: for backwards compatibility, this annotation may also mark
fields of type MethodRule, which will be honored. However,
this is a deprecated interface and feature.
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