Add blame unit test for file that is renamed twice.

Bug: 354507
Change-Id: I853774ecc1662d095a50a9668431c6e3ce4156c4
Signed-off-by: Kevin Sawicki <kevin@github.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

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

@@ -150,6 +150,48 @@ public class BlameCommandTest extends RepositoryTestCase {
 		assertEquals("file1.txt", lines.getSourcePath(2));
 	}
 
+	@Test
+	public void testTwoRenames() throws Exception {
+		Git git = new Git(db);
+
+		// Commit 1: Add file.txt
+		String[] content1 = new String[] { "a" };
+		writeTrashFile("file.txt", join(content1));
+		git.add().addFilepattern("file.txt").call();
+		RevCommit commit1 = git.commit().setMessage("create file").call();
+
+		// Commit 2: Rename to file1.txt
+		writeTrashFile("file1.txt", join(content1));
+		git.add().addFilepattern("file1.txt").call();
+		git.rm().addFilepattern("file.txt").call();
+		git.commit().setMessage("moving file").call();
+
+		// Commit 3: Edit file1.txt
+		String[] content2 = new String[] { "a", "b" };
+		writeTrashFile("file1.txt", join(content2));
+		git.add().addFilepattern("file1.txt").call();
+		RevCommit commit3 = git.commit().setMessage("editing file").call();
+
+		// Commit 4: Rename to file2.txt
+		writeTrashFile("file2.txt", join(content2));
+		git.add().addFilepattern("file2.txt").call();
+		git.rm().addFilepattern("file1.txt").call();
+		git.commit().setMessage("moving file again").call();
+
+		BlameCommand command = new BlameCommand(db);
+		command.setFollowFileRenames(true);
+		command.setFilePath("file2.txt");
+		BlameResult lines = command.call();
+
+		assertEquals(commit1, lines.getSourceCommit(0));
+		assertEquals(0, lines.getSourceLine(0));
+		assertEquals("file.txt", lines.getSourcePath(0));
+
+		assertEquals(commit3, lines.getSourceCommit(1));
+		assertEquals(1, lines.getSourceLine(1));
+		assertEquals("file1.txt", lines.getSourcePath(1));
+	}
+
 	@Test
 	public void testDeleteTrailingLines() throws Exception {
 		Git git = new Git(db);