testThrowingFullLayout failed

[AresEkb]

Hi

I cloned the repository and initiated a build process gradlew build.

I've got a failed testThrowingFullLayout:

org.junit.ComparisonFailure: expected:<...ullPointerException)[
]
> but was:<...ullPointerException)[]
>
    at org.junit.Assert.assertEquals(Assert.java:115)
    at org.junit.Assert.assertEquals(Assert.java:144)
    at org.eclipse.sprotty.DefaultDiagramServerTest.testThrowingFullLayout(DefaultDiagramServerTest.java:369)

Expected and actual values are trimmed. However I guess that NPE was thrown as expected. The problem is that exception text differs, maybe because of different JDK version.

I tried to change file https://github.com/eclipse/sprotty-server/blob/master/org.eclipse.sprotty/src/test/java/org/eclipse/sprotty/DefaultDiagramServerTest.xtend

Added println(logger.toString) to the end of testThrowingFullLayout and commented out assertEquals. But I can't build the project: Execution failed for task ':org.eclipse.sprotty.layout:generateTestXtext'. caused by java.lang.NoSuchMethodError: 'void com.google.common.base.Throwables.throwIfUnchecked(java.lang.Throwable)'

Could you please help to fix it?

[spoenemann]

Are you working on Windows? If yes I guess it's a line ending issue. Does the test work if you append .trim like this?

assertEquals('''
    ERROR: Exception while processing ComputedBoundsAction. (java.lang.NullPointerException)
'''.toString.trim, logger.toString.trim)

[AresEkb]

Thanks for the answer! Yes, I use Windows. I can't add trim and test it because in that case I get: Execution failed for task ':org.eclipse.sprotty.layout:generateTestXtext'.

Caused by: java.lang.NoSuchMethodError: 'void com.google.common.base.Throwables.throwIfUnchecked(java.lang.Throwable)'
    at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.reentrantResolve(DefaultReentrantTypeResolver.java:145)
    at org.eclipse.xtext.xbase.typesystem.internal.CompoundReentrantTypeResolver.reentrantResolve(CompoundReentrantTypeResolver.java:79)

I don't understand yet how to fix it.

[AresEkb]

Throwables.throwIfUnchecked(java.lang.Throwable) is available in guava since version 20.0.

org.eclipse.sprotty project depends on guava 27.1-jre. I have no idea why the method is unavailable.

[spoenemann]

I have no idea either :-(

[AresEkb]

The same error here: https://github.com/eclipse/xtext/issues/1391 Asked Xtext team: https://github.com/eclipse/xtext/issues/1772

[AresEkb]

Thanks for help!

You are right. Addition of trim solved the issue.

My 2nd issue with Xtext was caused by JAVA_HOME set to JDK 13. Old version of Xtext doesn't support this JDK. So switching JAVA_HOME to JDK 1.8 solved the error.

The following tests are failed now:

ElkLayoutEngineTest.testLayoutCrossHierarchyEdge1
ElkLayoutEngineTest.testLayoutCrossHierarchyEdge2
ElkLayoutEngineTest.testLayoutCrossHierarchyEdge3
ElkLayoutEngineTest.testLayoutCrossHierarchyEdge4

Errors for all tests are similar:

org.junit.ComparisonFailure: expected:<SEdge [[
  sourceId = "g/node0/node0"
  targetId = "g/node1/node0"
  routingPoints = ArrayList (
    Point [
      x = -20.0
      y = 10.0
    ],
    Point [
      x = -5.0
      y = 15.0
    ],
    Point [
      x = 10.0
      y = 10.0
    ]
  )
  selected = false
  type = "edge"
  id = "g/node1/edge1"
]
]> but was:<SEdge [[
  sourceId = "g/node0/node0"
  targetId = "g/node1/node0"
  routingPoints = ArrayList (
    Point [
      x = -20.0
      y = 10.0
    ],
    Point [
      x = -5.0
      y = 15.0
    ],
    Point [
      x = 10.0
      y = 10.0
    ]
  )
  selected = false
  type = "edge"
  id = "g/node1/edge1"]
]>

The visible difference between the results is the following (maybe line endings are different too):

  id = "g/node1/edge1"
]
]>

  id = "g/node1/edge1"]
]>

[spoenemann]

Yes, probably the same line ending problem. But if there are line endings in the middle of the string, trim won't help. It could be solved with a utility function like this:

def String toUnixLineEndings(String s) {
    s.replaceAll('\\r\\n', '\\n')
}

@AresEkb could you try that, and if it helps would you like to create a pull request fixing the tests on Windows?

[AresEkb]

Thanks! All tests are passed now. I created a pull request https://github.com/eclipse/sprotty-server/pull/72