java.lang.NullPointerException
	at org.eclipse.xtext.testing.AbstractLanguageServerTest.lambda$initialize$1(AbstractLanguageServerTest.java:289)
	at org.eclipse.xtext.xbase.lib.ObjectExtensions.operator_doubleArrow(ObjectExtensions.java:139)
	at org.eclipse.xtext.testing.AbstractLanguageServerTest.initialize(AbstractLanguageServerTest.java:291)
	at org.eclipse.xtext.testing.AbstractLanguageServerTest.initialize(AbstractLanguageServerTest.java:281)
	at org.eclipse.xtext.testing.AbstractLanguageServerTest.initializeContext(AbstractLanguageServerTest.java:814)
	at org.eclipse.xtext.testing.AbstractLanguageServerTest.testCompletion(AbstractLanguageServerTest.java:775)
	at de.abas.screen.ls.ide.tests.completion.ScreenServiceCompletionTest.testEndCompletion(ScreenServiceCompletionTest.java:23)

@Test
	def void test02_openFile() {
		initialize()

		val file = 'hello.mydsl'.writeFile("")
		file.open('''
			Hello Xtext!
		''')

		Assertions.assertTrue(diagnostics.get(file).empty, "There're issues in file 'hello.mydsl'.")
	}

package org.xtext.example.mydsl3.tests

import org.eclipse.xtext.testing.AbstractLanguageServerTest
import org.junit.Assert
import org.junit.Test

class MyTest extends AbstractLanguageServerTest {
	new() {
		super("mydsl3")
	}
	
	@Test
	def void test02_openFile() throws Exception {
		initialize();

		val file = 'hello.mydsl3'.writeFile("")
		file.open('''
			Hello Xtext!
		''')

		Assert.assertTrue("There're issues in file 'hello.mydsl'.", diagnostics.get(file).empty)
	}
	
}

@Test
	def void testEndCompletion() {

		testCompletion[
			model = '''Hello Xtext'''
			line = 0
			column = 10
			expectedCompletionItems = '''!'''

		]
	}

class AbstractScreenServiceLSPTest extends AbstractLanguageServerTest {
	
	new() {
		super('screenservice')
	}
	
	@Before @BeforeEach
	override void setup() {
		super.setup()
	}