AbstractOutlineTest: @Before and @BeforeEach annotations are missing on the overriden setUp() method.

[miklossy]

Whenever executing an outline test with JUnit5 runner, the following popup window opens:

Steps to reproduce:

1. Create the Xtext Hello World MyDsl project using JUnit5 support.
2. Add the following test case to the org.xtext.example.mydsl.ui.tests project:

package org.xtext.example.mydsl.ui.tests

import org.eclipse.xtext.testing.InjectWith
import org.eclipse.xtext.testing.extensions.InjectionExtension
import org.eclipse.xtext.ui.testing.AbstractOutlineTest
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.^extension.ExtendWith

@ExtendWith(InjectionExtension)
@InjectWith(MyDslUiInjectorProvider)
class MyDslOutlineTest extends AbstractOutlineTest {

	@Test def test() {
		'''
			Hello World!
		'''.assertAllLabels('''
			test
			  World
		''')
	}
}

3. Execute the test case as JUnit Plug-in Test, the popup described above appears.

Reason: The Xtext Nature should be added by the overriden setUp method, but it is not executed, since the @Before and @BeforeEach annotations are missing. These annotations are not inherited, see junit-team/junit5#960 (comment) , so they should be repeated also on the overridden method,

Solution: Repeat the annotations on the setUp() method of the AbstractOutlineTest class, similar to the setUp method of the AbstractCursorHandlingTest class.

[LorenzoBettini]

Fixed by #3011