BranchTest: Create Git instances in try-with-resource

Change-Id: I8becee479fab91a18e6daffd6f4fd57338c9d120
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/BranchTest.java

@@ -57,7 +57,9 @@ public class BranchTest extends CLIRepositoryTestCase {
 	@Before
 	public void setUp() throws Exception {
 		super.setUp();
-		new Git(db).commit().setMessage("initial commit").call();
+		try (Git git = new Git(db)) {
+			git.commit().setMessage("initial commit").call();
+		}
 	}
 
 	@Test
@@ -77,14 +79,16 @@ public class BranchTest extends CLIRepositoryTestCase {
 
 	@Test
 	public void testListContains() throws Exception {
-		new Git(db).branchCreate().setName("initial").call();
-		RevCommit second = new Git(db).commit().setMessage("second commit")
+		try (Git git = new Git(db)) {
+				git.branchCreate().setName("initial").call();
+			RevCommit second = git.commit().setMessage("second commit")
 					.call();
 			assertArrayOfLinesEquals(new String[] { "  initial", "* master", "" },
 					execute("git branch --contains 6fd41be"));
 			assertArrayOfLinesEquals(new String[] { "* master", "" },
 					execute("git branch --contains " + second.name()));
 		}
+	}
 
 	@Test
 	public void testExistingBranch() throws Exception {