diff --git a/test/bdd/steps/osm_data.py b/test/bdd/steps/steps_osm_data.py
similarity index 80%
rename from test/bdd/steps/osm_data.py
rename to test/bdd/steps/steps_osm_data.py
index c1043baa..465ad718 100644
--- a/test/bdd/steps/osm_data.py
+++ b/test/bdd/steps/steps_osm_data.py
@@ -1,8 +1,27 @@
-import subprocess
 import tempfile
 import random
 import os
 
+def write_opl_file(opl, grid):
+    """ Create a temporary OSM file from OPL and return the file name. It is
+        the responsibility of the caller to delete the file again.
+
+        Node with missing coordinates, can retrieve their coordinates from
+        a supplied grid. Failing that a random coordinate is assigned.
+    """
+    with tempfile.NamedTemporaryFile(suffix='.opl', delete=False) as fd:
+        for line in opl.splitlines():
+            if line.startswith('n') and line.find(' x') < 0:
+                coord = grid.grid_node(int(line[1:].split(' ')[0]))
+                if coord is None:
+                    coord = (random.random() * 360 - 180,
+                             random.random() * 180 - 90)
+                line += " x%f y%f" % coord
+            fd.write(line.encode('utf-8'))
+            fd.write(b'\n')
+
+        return fd.name
+
 @given(u'the ([0-9.]+ )?grid')
 def define_node_grid(context, grid_step):
     """
@@ -27,21 +46,11 @@ def load_osm_file(context):
 
     The data is expected as attached text in OPL format.
     """
-    # create a OSM file in /tmp and import it
-    with tempfile.NamedTemporaryFile(dir='/tmp', suffix='.opl', delete=False) as fd:
-        fname = fd.name
-        for line in context.text.splitlines():
-            if line.startswith('n') and line.find(' x') < 0:
-                coord = context.osm.grid_node(int(line[1:].split(' ')[0]))
-                if coord is None:
-                    coord = (random.random() * 360 - 180,
-                             random.random() * 180 - 90)
-                line += " x%f y%f" % coord
-            fd.write(line.encode('utf-8'))
-            fd.write(b'\n')
-
+    # create an OSM file and import it
+    fname = write_opl_file(context.text, context.osm)
     context.nominatim.run_setup_script('import-data', osm_file=fname,
                                        osm2pgsql_cache=300)
+    os.remove(fname)
 
     ### reintroduce the triggers/indexes we've lost by having osm2pgsql set up place again
     cur = context.db.cursor()
@@ -52,7 +61,6 @@ def load_osm_file(context):
     cur.execute("""CREATE UNIQUE INDEX idx_place_osm_unique on place using btree(osm_id,osm_type,class,type)""")
     context.db.commit()
 
-    os.remove(fname)
 
 @when(u'updating osm data')
 def update_from_osm_file(context):
@@ -77,15 +85,7 @@ def update_from_osm_file(context):
     context.nominatim.run_setup_script('create-functions', 'create-partition-functions',
                                        'enable-diff-updates')
 
-    # create a OSM file in /tmp and import it
-    with tempfile.NamedTemporaryFile(dir='/tmp', suffix='.opl', delete=False) as fd:
-        fname = fd.name
-        for line in context.text.splitlines():
-            if line.startswith('n') and line.find(' x') < 0:
-                    line += " x%d y%d" % (random.random() * 360 - 180,
-                                          random.random() * 180 - 90)
-            fd.write(line.encode('utf-8'))
-            fd.write(b'\n')
-
+    # create an OSM file and import it
+    fname = write_opl_file(context.text, context.osm)
     context.nominatim.run_update_script(import_diff=fname)
     os.remove(fname)