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Problems using AbstractLanguageServerTest [message #1791888]

Fri, 06 July 2018 10:59

Eclipse User

I created a new DSL with the Xtext wizard. I selected language server, Gradle build and JUnit 5 support.

I added a language server test in the <mydsl>.ide project in the source folder src/test/java.

The test class sublasses the AbstractLanguageServerTest and gives the language id in the constructor.

All my tests fail because of this NPE:

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)

I use Eclipse Photon and Xtext 2.14.0.
I fixed the build already like it is mentioned here: https://github.com/eclipse/xtext/issues/1231

My DSL is just the Greetings tutorial DSL and one of the failing tests is this:

@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'.")
	}

Everything works but not my test. What am I doing wrong?

Re: Problems using AbstractLanguageServerTest [message #1791890 is a reply to message #1791888]

Fri, 06 July 2018 11:16

Eclipse User

Hi,

can you please give more context. i cannot reproduce.

(1) did you add the mydsl.ide project to the test project
(2) is lsp4j and lsp4j.jsonrpc on the dependencies of your test project?

Re: Problems using AbstractLanguageServerTest [message #1791891 is a reply to message #1791890]

Fri, 06 July 2018 11:19

Eclipse User

besides that: debugging always helps to analyse

Re: Problems using AbstractLanguageServerTest [message #1791892 is a reply to message #1791891]

Fri, 06 July 2018 11:26

Eclipse User

Attached is my build.grade of the <mydsl>.ide project.

Attachment: build.gradle
(Size: 1.97KB, Downloaded 107 times)

Re: Problems using AbstractLanguageServerTest [message #1791893 is a reply to message #1791892]

Fri, 06 July 2018 11:27

Eclipse User

i miss e.g.

compile project(':de.abas.screen.ls.ide')

Re: Problems using AbstractLanguageServerTest [message #1791894 is a reply to message #1791893]

Fri, 06 July 2018 11:29

Eclipse User

I added the test to the project de.abas.screen.ls.ide itself.

Re: Problems using AbstractLanguageServerTest [message #1791895 is a reply to message #1791894]

Fri, 06 July 2018 11:35

Eclipse User

I added a screenshot of my project layout.

Attachment: project_layout_dsl.png
(Size: 35.99KB, Downloaded 118 times)

Re: Problems using AbstractLanguageServerTest [message #1791896 is a reply to message #1791895]

Fri, 06 July 2018 11:42

Eclipse User

When I debug I can see that the field languageServer of the class AbstractLanguageServerTest is always null. What could be the problem?

Re: Problems using AbstractLanguageServerTest [message #1791897 is a reply to message #1791894]

Fri, 06 July 2018 11:43

Eclipse User

i still cannot reproduce.
are you sure you got language id and file extension correct?

Re: Problems using AbstractLanguageServerTest [message #1791898 is a reply to message #1791897]

Fri, 06 July 2018 11:45

Eclipse User

Do you recommend to add an extra test project or is it ok to add the test inside the test source folder of the <mydsl>.ide project?

Re: Problems using AbstractLanguageServerTest [message #1791899 is a reply to message #1791898]

Fri, 06 July 2018 11:46

Eclipse User

it is ok i tried both and it works fine

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)
	}
	
}

Re: Problems using AbstractLanguageServerTest [message #1791900 is a reply to message #1791899]

Fri, 06 July 2018 11:49

Eclipse User

How does your build.gradle file look like?

Re: Problems using AbstractLanguageServerTest [message #1791901 is a reply to message #1791900]

Fri, 06 July 2018 11:52

Eclipse User

no change besides the workaround for signature exception.

=> i am sure you have the wrong file extension

Re: Problems using AbstractLanguageServerTest [message #1791902 is a reply to message #1791901]

Fri, 06 July 2018 11:55

Eclipse User

I also have this test and this does not work either:

@Test
	def void testEndCompletion() {

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

		]
	}

Re: Problems using AbstractLanguageServerTest [message #1791903 is a reply to message #1791901]

Fri, 06 July 2018 11:56

Eclipse User

can you please share your complete hello world project

Re: Problems using AbstractLanguageServerTest [message #1791905 is a reply to message #1791903]

Fri, 06 July 2018 11:59

Eclipse User

I packed everything as ZIP archive and removed the .gradle folder.

Attachment: de.abas.screen.ls.parent.zip
(Size: 273.85KB, Downloaded 111 times)

Re: Problems using AbstractLanguageServerTest [message #1791906 is a reply to message #1791905]

Fri, 06 July 2018 12:12

Eclipse User

you use junit 5 .
abstractlanguageservertest does not support that.
please open a bug at xtext-core

workaround:

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

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