ResolveMergerTest: Open Git in try-with-resource

Change-Id: Ic378ec25c4a3ea4354ee643029f87e46b6449ed4
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/ResolveMergerTest.java

@@ -88,35 +88,36 @@ public class ResolveMergerTest extends RepositoryTestCase {
 		file = new File(folder1, "file2.txt");
 		write(file, "folder1--file2.txt");
 
-		Git git = new Git(db);
-		git.add().addFilepattern(folder1.getName()).call();
-		RevCommit base = git.commit().setMessage("adding folder").call();
-
-		recursiveDelete(folder1);
-		git.rm().addFilepattern("folder1/file1.txt")
-				.addFilepattern("folder1/file2.txt").call();
-		RevCommit other = git.commit()
-				.setMessage("removing folders on 'other'").call();
-
-		git.checkout().setName(base.name()).call();
-
-		file = new File(db.getWorkTree(), "unrelated.txt");
-		write(file, "unrelated");
-
-		git.add().addFilepattern("unrelated.txt").call();
-		RevCommit head = git.commit().setMessage("Adding another file").call();
-
-		// Untracked file to cause failing path for delete() of folder1
-		// but that's ok.
-		file = new File(folder1, "file3.txt");
-		write(file, "folder1--file3.txt");
-
-		ResolveMerger merger = (ResolveMerger) strategy.newMerger(db, false);
-		merger.setCommitNames(new String[] { "BASE", "HEAD", "other" });
-		merger.setWorkingTreeIterator(new FileTreeIterator(db));
-		boolean ok = merger.merge(head.getId(), other.getId());
-		assertTrue(ok);
-		assertTrue(file.exists());
+		try (Git git = new Git(db)) {
+			git.add().addFilepattern(folder1.getName()).call();
+			RevCommit base = git.commit().setMessage("adding folder").call();
+
+			recursiveDelete(folder1);
+			git.rm().addFilepattern("folder1/file1.txt")
+					.addFilepattern("folder1/file2.txt").call();
+			RevCommit other = git.commit()
+					.setMessage("removing folders on 'other'").call();
+
+			git.checkout().setName(base.name()).call();
+
+			file = new File(db.getWorkTree(), "unrelated.txt");
+			write(file, "unrelated");
+
+			git.add().addFilepattern("unrelated.txt").call();
+			RevCommit head = git.commit().setMessage("Adding another file").call();
+
+			// Untracked file to cause failing path for delete() of folder1
+			// but that's ok.
+			file = new File(folder1, "file3.txt");
+			write(file, "folder1--file3.txt");
+
+			ResolveMerger merger = (ResolveMerger) strategy.newMerger(db, false);
+			merger.setCommitNames(new String[] { "BASE", "HEAD", "other" });
+			merger.setWorkingTreeIterator(new FileTreeIterator(db));
+			boolean ok = merger.merge(head.getId(), other.getId());
+			assertTrue(ok);
+			assertTrue(file.exists());
+		}
 	}
 
 	/**