diff --git a/README.md b/README.md
index ed6c322..92298c1 100644
--- a/README.md
+++ b/README.md
@@ -139,7 +139,6 @@ Here are some sources of inspirations for this project :
 A list of ideas and TODO. Don't hesitate to give feedback on the ones you really want or to propose your owns.
 
 60. Unittest
-70. Export of bibtex
 80. Search engine
 85. Anti-duplicate ?
 90. Look for published version in arXiv
diff --git a/bmc.py b/bmc.py
index a494b1c..935ca3b 100755
--- a/bmc.py
+++ b/bmc.py
@@ -432,14 +432,14 @@ if __name__ == '__main__':
     parser_import.add_argument('file',  nargs='+',
                                help="path to the file to import")
     parser_import.add_argument('--skip',  nargs='+',
-                               help="path to files to skip")
+                               help="path to files to skip", default=[])
     parser_import.set_defaults(func='import')
 
     parser_delete = subparsers.add_parser('delete', help="delete help")
     parser_delete.add_argument('entries', metavar='entry', nargs='+',
                                help="a filename or an identifier")
     parser_delete.add_argument('--skip',  nargs='+',
-                               help="path to files to skip")
+                               help="path to files to skip", default=[])
     group = parser_delete.add_mutually_exclusive_group()
     group.add_argument('--id', action="store_true", default=False,
                        help="id based deletion")
@@ -454,7 +454,7 @@ if __name__ == '__main__':
     parser_edit.add_argument('entries', metavar='entry', nargs='+',
                              help="a filename or an identifier")
     parser_edit.add_argument('--skip',  nargs='+',
-                             help="path to files to skip")
+                             help="path to files to skip", default=[])
     group = parser_edit.add_mutually_exclusive_group()
     group.add_argument('--id', action="store_true", default=False,
                        help="id based deletion")
@@ -561,7 +561,7 @@ if __name__ == '__main__':
                     sys.exit("Unable to open file associated " +
                              "to ident "+filename)
             sys.exit()
-        
+
         elif args.func == 'export':
             bibtex = ''
             for id in args.ids:
diff --git a/tests/test_backend.py b/tests/test_backend.py
index 0415fdf..79783ee 100644
--- a/tests/test_backend.py
+++ b/tests/test_backend.py
@@ -8,3 +8,40 @@
 # <del>beer</del> soda in return.
 #                                                                   Phyks
 # -----------------------------------------------------------------------------
+import unittest
+from backend import *
+
+
+class TestFetcher(unittest.TestCase):
+    def test_getNewName(self):
+        return
+
+    def test_bibtexAppend(self):
+        return
+
+    def test_bibtexEdit(self):
+        return
+
+    def test_bibtexRewrite(self):
+        return
+
+    def test_deleteId(self):
+        return
+
+    def test_deleteFile(self):
+        return
+
+    def test_diffFilesIndex(self):
+        return
+
+    def test_getBibtex(self):
+        return
+
+    def test_getEntries(self):
+        return
+
+    def test_updateArxiv(self):
+        return
+
+if __name__ == '__main__':
+    unittest.main()