tests: use larger grid to avoid rouding errors

test/bdd/db/import/addressing.feature

@@ -81,7 +81,7 @@ Feature: Address computation
             | W1     | W11     |
 
     Scenario: Locality points should contain all boundaries they touch
-        Given the grid
+        Given the 0.001 grid
             | 1 |   |   | 2 |   | 3 |
             |   |   |   | 8 |   |   |
             | 4 |   |   | 5 |   | 6 |

test/bdd/steps/osm_data.py

@@ -4,13 +4,13 @@ import random
 import os
 from nose.tools import * # for assert functions
 
-@given(u'the (\d+ )?grid')
+@given(u'the ([0-9.]+ )?grid')
 def define_node_grid(context, grid_step):
     """
     Define a grid of node positions.
     """
     if grid_step is not None:
-        grid_step = int(grd_step.strip())
+        grid_step = float(grid_step.strip())
     else:
         grid_step = 0.00001