diff --git a/test/signatures.vim b/test/signatures.vim
index 102a343..c2e3813 100644
--- a/test/signatures.vim
+++ b/test/signatures.vim
@@ -20,9 +20,20 @@ describe 'signatures'
         doautocmd InsertLeave 
         Expect getline(1) == ''
     end
+
     it 'no signature'
         normal ostr 
         Python jedi_vim.show_call_signatures()
         Expect getline(1, '$') == ['', 'str ']
     end
+
+    it 'signatures disabled'
+        let g:jedi#show_signatures = 0
+
+        normal ostr( 
+        Python jedi_vim.show_call_signatures()
+        Expect getline(1, '$') == ['', 'str( ']
+
+        let g:jedi#show_signatures = 1
+    end
 end