PullCommandTest: Open RevWalk in try-with-resource

Change-Id: I676cd7ef4bb29f980a313acd77506dd070e6c98f
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PullCommandTest.java

@@ -140,12 +140,13 @@ public class PullCommandTest extends RepositoryTestCase {
 		ObjectId[] mergedCommits = mergeResult.getMergedCommits();
 		assertEquals(targetCommit.getId(), mergedCommits[0]);
 		assertEquals(sourceCommit.getId(), mergedCommits[1]);
-		RevCommit mergeCommit = new RevWalk(dbTarget).parseCommit(mergeResult
-				.getNewHead());
+		try (RevWalk rw = new RevWalk(dbTarget)) {
+			RevCommit mergeCommit = rw.parseCommit(mergeResult.getNewHead());
 			String message = "Merge branch 'master' of "
 					+ db.getWorkTree().getAbsolutePath();
 			assertEquals(message, mergeCommit.getShortMessage());
 		}
+	}
 
 	@Test
 	public void testPullConflict() throws Exception {
@@ -259,12 +260,13 @@ public class PullCommandTest extends RepositoryTestCase {
 		ObjectId[] mergedCommits = mergeResult.getMergedCommits();
 		assertEquals(targetCommit.getId(), mergedCommits[0]);
 		assertEquals(sourceCommit.getId(), mergedCommits[1]);
-		RevCommit mergeCommit = new RevWalk(dbTarget).parseCommit(mergeResult
-				.getNewHead());
+		try (RevWalk rw = new RevWalk(dbTarget)) {
+			RevCommit mergeCommit = rw.parseCommit(mergeResult.getNewHead());
 			String message = "Merge branch 'other' of "
 					+ db.getWorkTree().getAbsolutePath();
 			assertEquals(message, mergeCommit.getShortMessage());
 		}
+	}
 
 	@Test
 	public void testPullMergeProgrammaticConfigurationImpliedTargetBranch()
@@ -293,12 +295,13 @@ public class PullCommandTest extends RepositoryTestCase {
 		ObjectId[] mergedCommits = mergeResult.getMergedCommits();
 		assertEquals(targetCommit.getId(), mergedCommits[0]);
 		assertEquals(sourceCommit.getId(), mergedCommits[1]);
-		RevCommit mergeCommit = new RevWalk(dbTarget).parseCommit(mergeResult
-				.getNewHead());
+		try (RevWalk rw = new RevWalk(dbTarget)) {
+			RevCommit mergeCommit = rw.parseCommit(mergeResult.getNewHead());
 			String message = "Merge branch 'other' of "
 					+ db.getWorkTree().getAbsolutePath() + " into other";
 			assertEquals(message, mergeCommit.getShortMessage());
 		}
+	}
 
 	private enum TestPullMode {
 		MERGE, REBASE, REBASE_PREASERVE