new file mode 100644
--- /dev/null
+++ b/tests/test_pull.py
@@ -0,0 +1,72 @@
+import test_util
+
+import os.path
+import subprocess
+from mercurial import ui
+
+import wrappers
+
+
+class TestPull(test_util.TestBase):
+    def setUp(self):
+        super(TestPull, self).setUp()
+        self.svn_wc = None
+
+    def _load_fixture_and_fetch(self, fixture_name):
+        return test_util.load_fixture_and_fetch(fixture_name, self.repo_path,
+                                                self.wc_path, stupid=False,
+                                                noupdate=False)
+
+    def _add_svn_rev(self, changes):
+        # changes is a dict of filename -> contents
+        if self.svn_wc is None:
+            self.svn_wc = os.path.join(self.tmpdir, 'testsvn_wc')
+            subprocess.call([
+                'svn', 'co', '-q', test_util.fileurl(self.repo_path), 
+                self.svn_wc
+            ])
+
+        for filename, contents in changes.iteritems():
+            # filenames are / separated
+            filename = filename.replace('/', os.path.sep)
+            filename = os.path.join(self.svn_wc, filename)
+            open(filename, 'w').write(contents)
+            subprocess.call(['svn', 'add', '-q', filename]) # may be redundant
+        subprocess.call([
+            'svn', 'commit', '-q', self.svn_wc, '-m', 'test changes'])
+
+    def test_nochanges(self):
+        repo = self._load_fixture_and_fetch('single_rev.svndump')
+        state = repo.parents()
+        wrappers.pull(None, ui.ui(), repo)
+        self.assertEqual(state, repo.parents())
+
+    def test_onerevision_noupdate(self):
+        repo = self._load_fixture_and_fetch('single_rev.svndump')
+        state = repo.parents()
+        self._add_svn_rev({'trunk/alpha': 'Changed'})
+        wrappers.pull(None, ui.ui(), repo)
+        self.assertEqual(state, repo.parents())
+        self.assertTrue('tip' not in repo[None].tags())
+    
+    def test_onerevision_doupdate(self):
+        repo = self._load_fixture_and_fetch('single_rev.svndump')
+        state = repo.parents()
+        self._add_svn_rev({'trunk/alpha': 'Changed'})
+        wrappers.pull(None, ui.ui(), repo, update=True)
+        self.failIfEqual(state, repo.parents())
+        self.assertTrue('tip' in repo[None].tags())
+
+    def test_onerevision_divergent(self):
+        repo = self._load_fixture_and_fetch('single_rev.svndump')
+        self.commitchanges((('alpha', 'alpha', 'Changed another way'),))
+        state = repo.parents()
+        self._add_svn_rev({'trunk/alpha': 'Changed one way'})
+        wrappers.pull(None, ui.ui(), repo, update=True)
+        self.assertEqual(state, repo.parents())
+        self.assertTrue('tip' not in repo[None].tags())
+        self.assertEqual(len(repo.heads()), 2)
+
+def suite():
+    import unittest, sys
+    return unittest.findTestCases(sys.modules[__name__])