diff --git a/tests-clar/revwalk/mergebase.c b/tests-clar/revwalk/mergebase.c
index 91bc6ae8c..e807e3ad2 100644
--- a/tests-clar/revwalk/mergebase.c
+++ b/tests-clar/revwalk/mergebase.c
@@ -35,3 +35,114 @@ void test_revwalk_mergebase__single2(void)
 	cl_git_pass(git_merge_base(&result, _repo, &one, &two));
 	cl_assert(git_oid_cmp(&result, &expected) == 0);
 }
+
+void test_revwalk_mergebase__merged_branch(void)
+{
+	git_oid result, one, two, expected;
+
+	git_oid_fromstr(&one, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&two, "9fd738e8f7967c078dceed8190330fc8648ee56a");
+	git_oid_fromstr(&expected, "9fd738e8f7967c078dceed8190330fc8648ee56a");
+
+	cl_git_pass(git_merge_base(&result, _repo, &one, &two));
+	cl_assert(git_oid_cmp(&result, &expected) == 0);
+
+	cl_git_pass(git_merge_base(&result, _repo, &two, &one));
+	cl_assert(git_oid_cmp(&result, &expected) == 0);
+}
+
+void test_revwalk_mergebase__no_common_ancestor_returns_ENOTFOUND(void)
+{
+	git_oid result, one, two, expected;
+	int error;
+
+	git_oid_fromstr(&one, "763d71aadf09a7951596c9746c024e7eece7c7af");
+	git_oid_fromstr(&two, "e90810b8df3e80c413d903f631643c716887138d");
+	git_oid_fromstr(&expected, "c47800c7266a2be04c571c04d5a6614691ea99bd");
+
+	error = git_merge_base(&result, _repo, &one, &two);
+	cl_git_fail(error);
+
+	cl_assert_equal_i(GIT_ENOTFOUND, error);
+}
+
+/*
+ * $ git log --graph --all
+ * * commit 763d71aadf09a7951596c9746c024e7eece7c7af
+ * | Author: nulltoken <emeric.fermas@gmail.com>
+ * | Date:   Sun Oct 9 12:54:47 2011 +0200
+ * |
+ * |     Add some files into subdirectories
+ * |
+ * | * commit a65fedf39aefe402d3bb6e24df4d4f5fe4547750
+ * | | Author: Scott Chacon <schacon@gmail.com>
+ * | | Date:   Tue Aug 9 19:33:46 2011 -0700
+ * | |
+ * | *   commit be3563ae3f795b2b4353bcce3a527ad0a4f7f644
+ * | |\  Merge: 9fd738e c47800c
+ * | |/  Author: Scott Chacon <schacon@gmail.com>
+ * |/|   Date:   Tue May 25 11:58:27 2010 -0700
+ * | |
+ * | |       Merge branch 'br2'
+ * | |
+ * | | * commit e90810b8df3e80c413d903f631643c716887138d
+ * | | | Author: Vicent Marti <tanoku@gmail.com>
+ * | | | Date:   Thu Aug 5 18:42:20 2010 +0200
+ * | | |
+ * | | |     Test commit 2
+ * | | |
+ * | | * commit 6dcf9bf7541ee10456529833502442f385010c3d
+ * | |   Author: Vicent Marti <tanoku@gmail.com>
+ * | |   Date:   Thu Aug 5 18:41:33 2010 +0200
+ * | |
+ * | |       Test commit 1
+ * | |
+ * | | *   commit a4a7dce85cf63874e984719f4fdd239f5145052f
+ * | | |\  Merge: c47800c 9fd738e
+ * | |/ /  Author: Scott Chacon <schacon@gmail.com>
+ * |/| /   Date:   Tue May 25 12:00:23 2010 -0700
+ * | |/
+ * | |         Merge branch 'master' into br2
+ * | |
+ * | * commit 9fd738e8f7967c078dceed8190330fc8648ee56a
+ * | | Author: Scott Chacon <schacon@gmail.com>
+ * | | Date:   Mon May 24 10:19:19 2010 -0700
+ * | |
+ * | |     a fourth commit
+ * | |
+ * | * commit 4a202b346bb0fb0db7eff3cffeb3c70babbd2045
+ * | | Author: Scott Chacon <schacon@gmail.com>
+ * | | Date:   Mon May 24 10:19:04 2010 -0700
+ * | |
+ * | |     a third commit
+ * | |
+ * * | commit c47800c7266a2be04c571c04d5a6614691ea99bd
+ * |/  Author: Scott Chacon <schacon@gmail.com>
+ * |   Date:   Tue May 25 11:58:14 2010 -0700
+ * |
+ * |       branch commit one
+ * |
+ * * commit 5b5b025afb0b4c913b4c338a42934a3863bf3644
+ * | Author: Scott Chacon <schacon@gmail.com>
+ * | Date:   Tue May 11 13:38:42 2010 -0700
+ * |
+ * |     another commit
+ * |
+ * * commit 8496071c1b46c854b31185ea97743be6a8774479
+ *   Author: Scott Chacon <schacon@gmail.com>
+ *   Date:   Sat May 8 16:13:06 2010 -0700
+ * 
+ *       testing
+ * 
+ * * commit 41bc8c69075bbdb46c5c6f0566cc8cc5b46e8bd9
+ * | Author: Scott Chacon <schacon@gmail.com>
+ * | Date:   Tue May 11 13:40:41 2010 -0700
+ * |
+ * |     packed commit two
+ * |
+ * * commit 5001298e0c09ad9c34e4249bc5801c75e9754fa5
+ *   Author: Scott Chacon <schacon@gmail.com>
+ *   Date:   Tue May 11 13:40:23 2010 -0700
+ * 
+ *       packed commit one
+ */