[junit] Add comment to clarify dumbaware implementation

(cherry picked from commit cbf5ad87123890456a429754ca0a15d1adbb2d9c)

IJ-CR-179755

GitOrigin-RevId: e0f9ca6bc758de30e88eb560108c6be469c69154

plugins/junit/src/com/intellij/execution/junit/JUnit3Framework.java

@@ -13,6 +13,8 @@ public class JUnit3Framework extends JUnitTestFramework {
 
   @Override
   public boolean isDumbAware() {
+    // Only Java is available in dumb mode, other language implementation might not support it.
+    // For example, Kotlin, because it relies on light classes which require resolve.
     return this.getClass().isAssignableFrom(JUnit3Framework.class);
   }
 

plugins/junit/src/com/intellij/execution/junit/JUnit4Framework.java

@@ -18,6 +18,8 @@ public class JUnit4Framework extends JUnitTestFramework {
 
   @Override
   public boolean isDumbAware() {
+    // Only Java is available in dumb mode, other language implementation might not support it.
+    // For example, Kotlin, because it relies on light classes which require resolve.
     return this.getClass().isAssignableFrom(JUnit4Framework.class);
   }
 

plugins/junit/src/com/intellij/execution/junit/JUnit5Framework.java

@@ -25,6 +25,8 @@ public class JUnit5Framework extends JUnitTestFramework {
 
   @Override
   public boolean isDumbAware() {
+    // Only Java is available in dumb mode, other language implementation might not support it.
+    // For example, Kotlin, because it relies on light classes which require resolve.
     return this.getClass().isAssignableFrom(JUnit5Framework.class);
   }
 

plugins/junit/src/com/intellij/execution/junit/JUnit6Framework.java

@@ -13,6 +13,8 @@ import static com.siyeh.ig.junit.JUnitCommonClassNames.ORG_JUNIT_JUPITER_API_MET
 public class JUnit6Framework extends JUnit5Framework {
   @Override
   public boolean isDumbAware() {
+    // Only Java is available in dumb mode, other language implementation might not support it.
+    // For example, Kotlin, because it relies on light classes which require resolve.
     return this.getClass().isAssignableFrom(JUnit6Framework.class);
   }