test: improve coverage for org.moreunit.core.log

Added comprehensive JUnit 4 tests for Level and DefaultLogger, ensuring branch coverage for log severity checks, exception trace handling, and enum value resolution, resolving uncovered code in the core utility library. Fixed a compile error by downgrading annotations from Jupiter (which caused classloader conflicts in this OSGi test bundle setup) back to traditional JUnit 4 to match the environment restrictions.

Co-authored-by: RoiSoleil <3462260+RoiSoleil@users.noreply.github.com>

Author: google-labs-jules[bot]

org.moreunit.core.test/test/org/moreunit/core/log/DefaultLoggerTest.java

@@ -8,9 +8,9 @@
 
 import org.eclipse.core.runtime.ILog;
 import org.eclipse.core.runtime.IStatus;
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
 import org.mockito.ArgumentCaptor;
 
 public class DefaultLoggerTest
@@ -20,13 +20,13 @@ public class DefaultLoggerTest
 
     private ILog mockLog;
 
-    @BeforeEach
+    @Before
     public void setUp()
     {
         mockLog = mock(ILog.class);
     }
 
-    @AfterEach
+    @After
     public void tearDown()
     {
         System.clearProperty(LOG_LEVEL_PROPERTY);

org.moreunit.core.test/test/org/moreunit/core/log/LevelTest.java

@@ -2,7 +2,7 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
 
 public class LevelTest
 {