new file mode 100755
--- /dev/null
+++ b/tests/fixtures/unrelatedbranch.sh
@@ -0,0 +1,38 @@
+#!/bin/sh
+#
+# Generate unrelatedbranch.svndump
+#
+
+mkdir temp
+cd temp
+
+mkdir project-orig
+cd project-orig
+mkdir trunk
+mkdir branches
+cd ..
+
+svnadmin create testrepo
+svnurl=file://`pwd`/testrepo
+svn import project-orig $svnurl -m "init project"
+
+svn co $svnurl project
+cd project/trunk
+echo a > a
+svn add a
+svn ci -m "add a in trunk"
+cd ../branches
+# Create an unrelated branch with another file. It used to lead the converter
+# to think branch1 was a copy of trunk, even without copy information.
+mkdir branch1
+echo b > branch1/b
+svn add branch1
+svn ci -m "add b in branch1"
+# Make a real branch too for comparison
+svn cp ../trunk branch2
+echo b > branch2/b
+svn add branch2/b
+svn ci -m "add b to branch2"
+cd ../..
+
+svnadmin dump testrepo > ../unrelatedbranch.svndump

new file mode 100644
--- /dev/null
+++ b/tests/fixtures/unrelatedbranch.svndump
@@ -0,0 +1,172 @@
+SVN-fs-dump-format-version: 2
+
+UUID: c79f8bc0-a944-4a5d-aaa5-0ce23b313891
+
+Revision-number: 0
+Prop-content-length: 56
+Content-length: 56
+
+K 8
+svn:date
+V 27
+2008-11-23T18:54:03.376021Z
+PROPS-END
+
+Revision-number: 1
+Prop-content-length: 114
+Content-length: 114
+
+K 7
+svn:log
+V 12
+init project
+K 10
+svn:author
+V 7
+pmezard
+K 8
+svn:date
+V 27
+2008-11-23T18:54:03.444309Z
+PROPS-END
+
+Node-path: branches
+Node-kind: dir
+Node-action: add
+Prop-content-length: 10
+Content-length: 10
+
+PROPS-END
+
+
+Node-path: trunk
+Node-kind: dir
+Node-action: add
+Prop-content-length: 10
+Content-length: 10
+
+PROPS-END
+
+
+Revision-number: 2
+Prop-content-length: 116
+Content-length: 116
+
+K 7
+svn:log
+V 14
+add a in trunk
+K 10
+svn:author
+V 7
+pmezard
+K 8
+svn:date
+V 27
+2008-11-23T18:54:04.175530Z
+PROPS-END
+
+Node-path: trunk/a
+Node-kind: file
+Node-action: add
+Prop-content-length: 10
+Text-content-length: 2
+Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3
+Content-length: 12
+
+PROPS-END
+a
+
+
+Revision-number: 3
+Prop-content-length: 118
+Content-length: 118
+
+K 7
+svn:log
+V 16
+add b in branch1
+K 10
+svn:author
+V 7
+pmezard
+K 8
+svn:date
+V 27
+2008-11-23T18:54:05.192583Z
+PROPS-END
+
+Node-path: branches/branch1
+Node-kind: dir
+Node-action: add
+Prop-content-length: 10
+Content-length: 10
+
+PROPS-END
+
+
+Node-path: branches/branch1/b
+Node-kind: file
+Node-action: add
+Prop-content-length: 10
+Text-content-length: 2
+Text-content-md5: 3b5d5c3712955042212316173ccf37be
+Content-length: 12
+
+PROPS-END
+b
+
+
+Revision-number: 4
+Prop-content-length: 118
+Content-length: 118
+
+K 7
+svn:log
+V 16
+add b to branch2
+K 10
+svn:author
+V 7
+pmezard
+K 8
+svn:date
+V 27
+2008-11-23T18:54:07.185050Z
+PROPS-END
+
+Node-path: branches/branch2
+Node-kind: dir
+Node-action: add
+Node-copyfrom-rev: 1
+Node-copyfrom-path: trunk
+Prop-content-length: 34
+Content-length: 34
+
+K 13
+svn:mergeinfo
+V 0
+
+PROPS-END
+
+
+Node-path: branches/branch2/a
+Node-kind: file
+Node-action: add
+Node-copyfrom-rev: 2
+Node-copyfrom-path: trunk/a
+Text-copy-source-md5: 60b725f10c9c85c70d97880dfe8191b3
+
+
+Node-path: branches/branch2/b
+Node-kind: file
+Node-action: add
+Prop-content-length: 10
+Text-content-length: 2
+Text-content-md5: 3b5d5c3712955042212316173ccf37be
+Content-length: 12
+
+PROPS-END
+b
+
+

--- a/tests/run.py
+++ b/tests/run.py
@@ -4,6 +4,7 @@ import unittest
 
 sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
+import test_fetch_branches
 import test_fetch_command
 import test_fetch_command_regexes
 import test_fetch_renames
@@ -15,7 +16,8 @@ import test_push_eol
 import test_tags
 
 def suite():
-    return unittest.TestSuite([test_fetch_command.suite(),
+    return unittest.TestSuite([test_fetch_branches.suite(),
+                               test_fetch_command.suite(),
                                test_fetch_command_regexes.suite(),
                                test_fetch_renames.suite(),
                                test_fetch_truncated.suite(),

new file mode 100644
--- /dev/null
+++ b/tests/test_fetch_branches.py
@@ -0,0 +1,26 @@
+import sys
+import unittest
+
+import test_util
+
+
+class TestFetchBranches(test_util.TestBase):
+    def _load_fixture_and_fetch(self, fixture_name, stupid):
+        return test_util.load_fixture_and_fetch(fixture_name, self.repo_path,
+                                                self.wc_path, stupid=stupid)
+
+    def test_unrelatedbranch(self, stupid=False):
+        repo = self._load_fixture_and_fetch('unrelatedbranch.svndump', stupid)
+        heads = [repo[n] for n in repo.heads()]
+        heads = dict([(ctx.branch(), ctx) for ctx in heads])
+        # Let these tests disabled yet as the fix is not obvious
+        #self.assertEqual(heads['branch1'].manifest().keys(), ['b'])
+        #self.assertEqual(heads['branch2'].manifest().keys(), ['a', 'b'])
+
+    def test_unrelatedbranch_stupid(self):
+        self.test_unrelatedbranch(True)
+
+def suite():
+    all = [unittest.TestLoader().loadTestsFromTestCase(TestFetchBranches),
+          ]
+    return unittest.TestSuite(all)