Exercises fail to compile on Windows

[jclc]

Running tests with tmc-cli returns the following errors

PS X:\Tiedostot\Projektit\test\cert-test> tmc test
Testing: arith_funcs
warning: Supported source version 'RELEASE_6' from annotation processor 'fi.helsinki.cs.tmc.testscanner.TestMethodAnnota
tionProcessor' less than -source '1.8'
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:2: error: package fi.helsinki.cs.tmc.edutestutils
does not exist
import fi.helsinki.cs.tmc.edutestutils.Points;
                                      ^
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:3: error: package org.junit does not exist
import org.junit.Test;
                ^
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:4: error: package org.junit does not exist
import static org.junit.Assert.*;
                       ^
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:7: error: cannot find symbol
    @Test
     ^
  symbol:   class Test
  location: class ArithTest
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:8: error: cannot find symbol
    @Points("arith-funcs")
     ^
  symbol:   class Points
  location: class ArithTest
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:13: error: cannot find symbol
    @Test
     ^
  symbol:   class Test
  location: class ArithTest
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:14: error: cannot find symbol
    @Points("arith-funcs")
     ^
  symbol:   class Points
  location: class ArithTest
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:19: error: cannot find symbol
    @Test
     ^
  symbol:   class Test
  location: class ArithTest
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:20: error: cannot find symbol
    @Points("arith-funcs")
     ^
  symbol:   class Points
  location: class ArithTest
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:25: error: cannot find symbol
    @Test
     ^
  symbol:   class Test
  location: class ArithTest
X:\Tiedostot\Projektit\test\cert-test\arith_funcs\test\ArithTest.java:26: error: cannot find symbol
    @Points("arith-funcs")
     ^
  symbol:   class Points
  location: class ArithTest
11 errors
1 warning
Failed to connect to server.
Failed to run tests.
null