Remove unused JUnit Rule and TestName imports

This commit removes unused JUnit TestName rule imports and field
declarations from three test classes:
- PartRenderingEngineTests.java
- TestUnitRegistrationWindows.java
- TextEditorPluginTest.java

The TestName fields were declared but never used in the test methods.
This cleanup also removes debug println statements that were left in
TestUnitRegistrationWindows.java.

Fixes: #3451

Author: vogella

tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/workbench/PartRenderingEngineTests.java

@@ -71,7 +71,6 @@
 import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
-import org.junit.rules.TestName;
 import org.junit.rules.TestWatcher;
 import org.osgi.service.log.LogLevel;
 import org.osgi.service.log.LogListener;
@@ -99,9 +98,6 @@ public class PartRenderingEngineTests {
 	private boolean logged = false;
 	private Consumer<RuntimeException> runtimeExceptionHandler;
 
-	@Rule
-	public TestName testName = new TestName();
-
 	@Before
 	public void setUp() {
 		logged = false;

tests/org.eclipse.tests.urischeme/src/org/eclipse/urischeme/internal/registration/TestUnitRegistrationWindows.java

@@ -26,15 +26,10 @@
 import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;
-import org.junit.Rule;
 import org.junit.Test;
-import org.junit.rules.TestName;
 
 public class TestUnitRegistrationWindows {
 
-	@Rule
-	public TestName name = new TestName();
-
 	private static final String PATH_TO_OTHER_APPLICATION_EXE = "c:\\path\\to\\otherApplication.exe";
 	private static final String PATH_TO_ECLIPSE_EXE = "c:\\path\\with spaces\\to\\eclipse\\Eclipse.exe";
 	private static final String PATH_TO_ECLIPSE_HOME = "c:\\path\\with spaces\\to\\eclipse";
@@ -161,15 +156,13 @@ public void getLauncherPathFromLauncherProperty() throws Exception {
 
 	@Test
 	public void getLauncherPathFromEclipseHomeProperty() throws Exception {
-		System.out.println("registrationWindows1: " + registrationWindows);
 		System.clearProperty("eclipse.launcher");
 		System.setProperty("eclipse.home.location", URL_TO_ECLIPSE_HOME);
 		fileProvider.fileExistsAnswers.put(PATH_TO_ECLIPSE_HOME, true);
 		fileProvider.isDirectoryAnswers.put(PATH_TO_ECLIPSE_HOME, true);
 		fileProvider.newDirectoryStreamAnswers.computeIfAbsent(PATH_TO_ECLIPSE_HOME, path -> new HashMap<>())
 				.put("*.exe", Arrays.asList(PATH_TO_ECLIPSE_HOME + "\\Eclipse.exe"));
 
-		System.out.println("registrationWindows2: " + registrationWindows);
 		assertEquals(PATH_TO_ECLIPSE_EXE, registrationWindows.getEclipseLauncher());
 	}
 

tests/org.eclipse.ui.workbench.texteditor.tests/src/org/eclipse/ui/workbench/texteditor/tests/TextEditorPluginTest.java

@@ -21,9 +21,7 @@
 import java.util.Random;
 
 import org.junit.FixMethodOrder;
-import org.junit.Rule;
 import org.junit.Test;
-import org.junit.rules.TestName;
 import org.junit.runners.MethodSorters;
 
 import org.eclipse.ui.internal.texteditor.HistoryTracker;
@@ -36,9 +34,6 @@
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
 public class TextEditorPluginTest {
 
-	@Rule
-	public TestName testName = new TestName();
-
 	Random rand = new Random(55); //pseudo-random for repeatability
 
 	@Test