add new test files

gds/library.py

@@ -19,6 +19,17 @@ class Library(object):
     class LinkError(Exception):
         element = None
         pass
+    
+    
+    """
+    normalizes given coordinate according to library units
+    """
+    def normalize_coord(self, coord, to_meters=False):
+        fact = self.units_per_dbunit
+        if to_meters:
+            fact *= self.meters_per_unit
+        
+        return (coord[0] * fact, coord[1] * fact)
 
     def link_refs(self, progress_callback=None):
         class Progress(ProgressGetter):