fix the needs.junit.engine.jupiter and needs.junit.engine.vintage selectors in the build file, to narrow down their selection to only the JUnitLauncherTaskTest

build.xml

@@ -218,7 +218,7 @@
   <selector id="needs.junit.engine.vintage">
     <or>
       <!-- we need JUnit vintage engine only in tests where we test the junitlauncher task -->
-      <filename name="${optional.package}/junitlauncher/**/*"/>
+      <filename name="${optional.package}/junitlauncher/**/JUnitLauncherTaskTest.java"/>
       <filename name="org/example/junitlauncher/vintage/**/*"/>
     </or>
   </selector>
@@ -226,7 +226,7 @@
   <selector id="needs.junit.engine.jupiter">
     <or>
       <!-- we need JUnit jupiter engine only in tests where we test the junitlauncher task -->
-      <filename name="${optional.package}/junitlauncher/**/*"/>
+      <filename name="${optional.package}/junitlauncher/**/JUnitLauncherTaskTest.java"/>
       <filename name="org/example/junitlauncher/jupiter/**/*"/>
     </or>
   </selector>