Tidy up the code

src/tests/junit/org/apache/tools/ant/taskdefs/ExecStreamRedirectorTest.java

@@ -1,8 +1,6 @@
 package org.apache.tools.ant.taskdefs;
 
 import org.apache.tools.ant.BuildFileRule;
-import org.apache.tools.ant.Project;
-import org.apache.tools.ant.ProjectHelper;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;

src/tests/junit/org/apache/tools/ant/taskdefs/ExecuteWatchdogTest.java

@@ -74,7 +74,7 @@ public class ExecuteWatchdogTest {
         return Runtime.getRuntime().exec(cmdArray);
     }
 
-    private String getErrorOutput(Process p) throws Exception {
+    private String getErrorOutput(Process p) {
         BufferedReader err = new BufferedReader(new InputStreamReader(p.getErrorStream()));
         return err.lines().collect(Collectors.joining());
     }

src/tests/junit/org/apache/tools/ant/taskdefs/FilterTest.java

@@ -31,7 +31,6 @@ import org.junit.Rule;
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 

src/tests/junit/org/apache/tools/ant/taskdefs/JarTest.java

@@ -25,7 +25,6 @@ import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.IOException;
 import java.util.Collections;
-import java.util.Enumeration;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 

src/tests/junit/org/apache/tools/ant/taskdefs/optional/junit/JUnitTaskTest.java

@@ -585,7 +585,7 @@ public class JUnitTaskTest {
     }
 
     @Test
-    public void testCheckDuplicateAntJar() throws Exception {
+    public void testCheckDuplicateAntJar() {
         setupCheckDuplicateTest();
         buildRule.executeTarget("testCheckForkedPath");
         assertThat("Expecting the warning about the duplicate ant jar", buildRule.getLog(),

src/tests/junit/org/apache/tools/ant/types/ResourceOutputTest.java

@@ -110,7 +110,7 @@ public class ResourceOutputTest {
     }
 
     @Test
-    public void testpropertyoutput3() throws IOException {
+    public void testpropertyoutput3() {
         project.setNewProperty("bar", "bar");
         assertEquals("bar", project.getProperty("bar"));
     }

src/tests/junit/org/apache/tools/zip/UTF8ZipFilesTest.java

@@ -23,7 +23,6 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.nio.ByteBuffer;
 import java.util.Collections;
-import java.util.Enumeration;
 import java.util.zip.CRC32;
 import org.junit.Test;