diff --git a/rhodecode/tests/functional/test_compare.py b/rhodecode/tests/functional/test_compare.py
--- a/rhodecode/tests/functional/test_compare.py
+++ b/rhodecode/tests/functional/test_compare.py
@@ -1,12 +1,17 @@
 from rhodecode.tests import *
+from rhodecode.model.repo import RepoModel
+from rhodecode.model.meta import Session
+from rhodecode.model.db import Repository
+from rhodecode.model.scm import ScmModel
+from rhodecode.lib.vcs.backends.base import EmptyChangeset
 
 
 class TestCompareController(TestController):
 
     def test_index_tag(self):
         self.log_user()
-        tag1='0.1.3'
-        tag2='0.1.2'
+        tag1 = '0.1.3'
+        tag2 = '0.1.2'
         response = self.app.get(url(controller='compare', action='index',
                                     repo_name=HG_REPO,
                                     org_ref_type="tag",
@@ -50,3 +55,135 @@ class TestCompareController(TestControll
         response.mustcontain('%s@default -> %s@default' % (HG_REPO, HG_REPO))
         # branch are equal
         response.mustcontain('<tr><td>No changesets</td></tr>')
+
+    def test_compare_revisions(self):
+        self.log_user()
+        rev1 = '3d8f361e72ab'
+        rev2 = 'b986218ba1c9'
+        response = self.app.get(url(controller='compare', action='index',
+                                    repo_name=HG_REPO,
+                                    org_ref_type="rev",
+                                    org_ref=rev1,
+                                    other_ref_type="rev",
+                                    other_ref=rev2,
+                                    ))
+        response.mustcontain('%s@%s -> %s@%s' % (HG_REPO, rev1, HG_REPO, rev2))
+        ## outgoing changesets between those revisions
+        response.mustcontain("""<a href="/%s/changeset/3d8f361e72ab303da48d799ff1ac40d5ac37c67e">r1:%s</a>""" % (HG_REPO, rev1))
+
+        ## files
+        response.mustcontain("""<a href="/%s/compare/rev@%s...rev@%s#C--c8e92ef85cd1">.hgignore</a>""" % (HG_REPO, rev1, rev2))
+
+    def test_compare_remote_repos(self):
+        self.log_user()
+
+        form_data = dict(
+            repo_name=HG_FORK,
+            repo_name_full=HG_FORK,
+            repo_group=None,
+            repo_type='hg',
+            description='',
+            private=False,
+            copy_permissions=False,
+            landing_rev='tip',
+            update_after_clone=False,
+            fork_parent_id=Repository.get_by_repo_name(HG_REPO),
+        )
+        RepoModel().create_fork(form_data, cur_user=TEST_USER_ADMIN_LOGIN)
+
+        Session().commit()
+
+        rev1 = '7d4bc8ec6be5'
+        rev2 = '56349e29c2af'
+
+        response = self.app.get(url(controller='compare', action='index',
+                                    repo_name=HG_REPO,
+                                    org_ref_type="rev",
+                                    org_ref=rev1,
+                                    other_ref_type="rev",
+                                    other_ref=rev2,
+                                    repo=HG_FORK
+                                    ))
+
+        try:
+            response.mustcontain('%s@%s -> %s@%s' % (HG_REPO, rev1, HG_FORK, rev2))
+            ## outgoing changesets between those revisions
+
+            response.mustcontain("""<a href="/%s/changeset/7d4bc8ec6be56c0f10425afb40b6fc315a4c25e7">r6:%s</a>""" % (HG_REPO, rev1))
+            response.mustcontain("""<a href="/%s/changeset/6fff84722075f1607a30f436523403845f84cd9e">r5:6fff84722075</a>""" % (HG_REPO))
+            response.mustcontain("""<a href="/%s/changeset/2dda4e345facb0ccff1a191052dd1606dba6781d">r4:2dda4e345fac</a>""" % (HG_REPO))
+
+            ## files
+            response.mustcontain("""<a href="/%s/compare/rev@%s...rev@%s#C--9c390eb52cd6">vcs/backends/hg.py</a>""" % (HG_REPO, rev1, rev2))
+            response.mustcontain("""<a href="/%s/compare/rev@%s...rev@%s#C--41b41c1f2796">vcs/backends/__init__.py</a>""" % (HG_REPO, rev1, rev2))
+            response.mustcontain("""<a href="/%s/compare/rev@%s...rev@%s#C--2f574d260608">vcs/backends/base.py</a>""" % (HG_REPO, rev1, rev2))
+        finally:
+            RepoModel().delete(HG_FORK)
+
+    def test_compare_extra_commits(self):
+        self.log_user()
+
+        repo1 = RepoModel().create_repo(repo_name='one', repo_type='hg',
+                                        description='diff-test',
+                                        owner=TEST_USER_ADMIN_LOGIN)
+
+        repo2 = RepoModel().create_repo(repo_name='one-fork', repo_type='hg',
+                                        description='diff-test',
+                                        owner=TEST_USER_ADMIN_LOGIN)
+
+        Session().commit()
+        r1_id = repo1.repo_id
+        r1_name = repo1.repo_name
+        r2_id = repo2.repo_id
+        r2_name = repo2.repo_name
+
+        #commit something !
+        cs0 = ScmModel().create_node(
+            repo=repo1.scm_instance, repo_name=r1_name,
+            cs=EmptyChangeset(alias='hg'), user=TEST_USER_ADMIN_LOGIN,
+            author=TEST_USER_ADMIN_LOGIN,
+            message='commit1',
+            content='line1',
+            f_path='file1'
+        )
+
+        cs0_prim = ScmModel().create_node(
+            repo=repo2.scm_instance, repo_name=r2_name,
+            cs=EmptyChangeset(alias='hg'), user=TEST_USER_ADMIN_LOGIN,
+            author=TEST_USER_ADMIN_LOGIN,
+            message='commit1',
+            content='line1',
+            f_path='file1'
+        )
+
+        cs1 = ScmModel().commit_change(
+            repo=repo2.scm_instance, repo_name=r2_name,
+            cs=cs0_prim, user=TEST_USER_ADMIN_LOGIN, author=TEST_USER_ADMIN_LOGIN,
+            message='commit2',
+            content='line1\nline2',
+            f_path='file1'
+        )
+
+        rev1 = 'default'
+        rev2 = 'default'
+        response = self.app.get(url(controller='compare', action='index',
+                                    repo_name=r2_name,
+                                    org_ref_type="branch",
+                                    org_ref=rev1,
+                                    other_ref_type="branch",
+                                    other_ref=rev2,
+                                    repo=r1_name
+                                    ))
+
+        try:
+            response.mustcontain('%s@%s -> %s@%s' % (r2_name, rev1, r1_name, rev2))
+
+            response.mustcontain("""<div class="message">commit2</div>""")
+            response.mustcontain("""<a href="/%s/changeset/%s">r1:%s</a>""" % (r2_name, cs1.raw_id, cs1.short_id))
+            ## files
+            response.mustcontain("""<a href="/%s/compare/branch@%s...branch@%s#C--826e8142e6ba">file1</a>""" % (r2_name, rev1, rev2))
+
+
+        finally:
+            RepoModel().delete(r1_id)
+            RepoModel().delete(r2_id)