ResolveMergerTest: Add tests for content merges

Change-Id: I2b85cc239e9b3090426c956cbf9af3deb4106a41

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

@@ -586,6 +586,64 @@ public class ResolveMergerTest extends RepositoryTestCase {
 		}
 	}
 
+	@Theory
+	public void checkContentMergeNoConflict(MergeStrategy strategy)
+			throws Exception {
+		Git git = Git.wrap(db);
+
+		writeTrashFile("file", "1\n2\n3");
+		git.add().addFilepattern("file").call();
+		RevCommit first = git.commit().setMessage("added file").call();
+
+		writeTrashFile("file", "1master\n2\n3");
+		git.commit().setAll(true).setMessage("modified file on master").call();
+
+		git.checkout().setCreateBranch(true).setStartPoint(first)
+				.setName("side").call();
+		writeTrashFile("file", "1\n2\n3side");
+		RevCommit sideCommit = git.commit().setAll(true)
+				.setMessage("modified file on side").call();
+
+		git.checkout().setName("master").call();
+		MergeResult result =
+				git.merge().setStrategy(strategy).include(sideCommit).call();
+		assertEquals(MergeStatus.MERGED, result.getMergeStatus());
+		String expected = "1master\n2\n3side";
+		assertEquals(expected, read("file"));
+	}
+
+	@Theory
+	public void checkContentMergeConflict(MergeStrategy strategy)
+			throws Exception {
+		Git git = Git.wrap(db);
+
+		writeTrashFile("file", "1\n2\n3");
+		git.add().addFilepattern("file").call();
+		RevCommit first = git.commit().setMessage("added file").call();
+
+		writeTrashFile("file", "1master\n2\n3");
+		git.commit().setAll(true).setMessage("modified file on master").call();
+
+		git.checkout().setCreateBranch(true).setStartPoint(first)
+				.setName("side").call();
+		writeTrashFile("file", "1side\n2\n3");
+		RevCommit sideCommit = git.commit().setAll(true)
+				.setMessage("modified file on side").call();
+
+		git.checkout().setName("master").call();
+		MergeResult result =
+				git.merge().setStrategy(strategy).include(sideCommit).call();
+		assertEquals(MergeStatus.CONFLICTING, result.getMergeStatus());
+		String expected = "<<<<<<< HEAD\n"
+				+ "1master\n"
+				+ "=======\n"
+				+ "1side\n"
+				+ ">>>>>>> " + sideCommit.name() + "\n"
+				+ "2\n"
+				+ "3";
+		assertEquals(expected, read("file"));
+	}
+
 	/**
 	 * Merging after criss-cross merges. In this case we merge together two
 	 * commits which have two equally good common ancestors