T0003_BasicTest: Open autocloseable types in try-with-resource

FileRepository and ObjectInserter.Formatter are autocloseable, so
use try-with-resource for these.

Remove suppression of unused variable warning that is no longer
necessary.

Change-Id: I270829f0a4030083c9599eb5785b0145dc590ed8
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/T0003_BasicTest.java

@@ -354,14 +354,14 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 
 	@Test
 	public void test007_Open() throws IOException {
-		final FileRepository db2 = new FileRepository(db.getDirectory());
+		try (final FileRepository db2 = new FileRepository(db.getDirectory())) {
 			assertEquals(db.getDirectory(), db2.getDirectory());
 			assertEquals(db.getObjectDatabase().getDirectory(), db2
 					.getObjectDatabase().getDirectory());
 			assertNotSame(db.getConfig(), db2.getConfig());
 		}
+	}
 
-	@SuppressWarnings("unused")
 	@Test
 	public void test008_FailOnWrongVersion() throws IOException {
 		final File cfg = new File(db.getDirectory(), Constants.CONFIG);
@@ -370,8 +370,7 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 				+ badvers + "\n";
 		write(cfg, configStr);
 
-		try {
-			new FileRepository(db.getDirectory());
+		try (FileRepository unused = new FileRepository(db.getDirectory())) {
 			fail("incorrectly opened a bad repository");
 		} catch (IllegalArgumentException ioe) {
 			assertNotNull(ioe.getMessage());
@@ -533,10 +532,11 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 	public void test025_computeSha1NoStore() throws IOException {
 		byte[] data = "test025 some data, more than 16 bytes to get good coverage"
 				.getBytes("ISO-8859-1");
-		final ObjectId id = new ObjectInserter.Formatter().idFor(
-				Constants.OBJ_BLOB, data);
+		try (ObjectInserter.Formatter formatter = new ObjectInserter.Formatter()) {
+			final ObjectId id = formatter.idFor(Constants.OBJ_BLOB, data);
 			assertEquals("4f561df5ecf0dfbd53a0dc0f37262fef075d9dde", id.name());
 		}
+	}
 
 	@Test
 	public void test026_CreateCommitMultipleparents() throws IOException {