X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/5449cf4adcc1fad4b9f43426e6d3e4a8f65e6fbb..65b009ea320ad6a5034bca6c2ce250f043f7bf8d:/test/functional/relation_controller_test.rb

diff --git a/test/functional/relation_controller_test.rb b/test/functional/relation_controller_test.rb
index d2dacd79c..4737fdf51 100644
--- a/test/functional/relation_controller_test.rb
+++ b/test/functional/relation_controller_test.rb
@@ -4,6 +4,48 @@ require 'relation_controller'
 class RelationControllerTest < ActionController::TestCase
   api_fixtures
 
+  ##
+  # test all routes which lead to this controller
+  def test_routes
+    assert_routing(
+      { :path => "/api/0.6/relation/create", :method => :put },
+      { :controller => "relation", :action => "create" }
+    )
+    assert_routing(
+      { :path => "/api/0.6/relation/1/full", :method => :get },
+      { :controller => "relation", :action => "full", :id => "1" }
+    )
+    assert_routing(
+      { :path => "/api/0.6/relation/1", :method => :get },
+      { :controller => "relation", :action => "read", :id => "1" }
+    )
+    assert_routing(
+      { :path => "/api/0.6/relation/1", :method => :put },
+      { :controller => "relation", :action => "update", :id => "1" }
+    )
+    assert_routing(
+      { :path => "/api/0.6/relation/1", :method => :delete },
+      { :controller => "relation", :action => "delete", :id => "1" }
+    )
+    assert_routing(
+      { :path => "/api/0.6/relations", :method => :get },
+      { :controller => "relation", :action => "relations" }
+    )
+
+    assert_routing(
+      { :path => "/api/0.6/node/1/relations", :method => :get },
+      { :controller => "relation", :action => "relations_for_node", :id => "1" }
+    )
+    assert_routing(
+      { :path => "/api/0.6/way/1/relations", :method => :get },
+      { :controller => "relation", :action => "relations_for_way", :id => "1" }
+    )
+    assert_routing(
+      { :path => "/api/0.6/relation/1/relations", :method => :get },
+      { :controller => "relation", :action => "relations_for_relation", :id => "1" }
+    )
+  end
+
   # -------------------------------------
   # Test reading relations.
   # -------------------------------------
@@ -72,16 +114,95 @@ class RelationControllerTest < ActionController::TestCase
     end
   end
 
+  ##
+  # test fetching multiple relations
+  def test_relations
+    # check error when no parameter provided
+    get :relations
+    assert_response :bad_request
+
+    # check error when no parameter value provided
+    get :relations, :relations => ""
+    assert_response :bad_request
+
+    # test a working call
+    get :relations, :relations => "1,2,4,7"
+    assert_response :success
+    assert_select "osm" do
+      assert_select "relation", :count => 4
+      assert_select "relation[id=1][visible=true]", :count => 1
+      assert_select "relation[id=2][visible=false]", :count => 1
+      assert_select "relation[id=4][visible=true]", :count => 1
+      assert_select "relation[id=7][visible=true]", :count => 1
+    end
+
+    # check error when a non-existent relation is included
+    get :relations, :relations => "1,2,4,7,400"
+    assert_response :not_found
+  end
+
   # -------------------------------------
   # Test simple relation creation.
   # -------------------------------------
 
   def test_create
-    basic_authorization "test@openstreetmap.org", "test"
+    basic_authorization users(:normal_user).email, "test"
     
     # put the relation in a dummy fixture changset
     changeset_id = changesets(:normal_user_first_change).id
 
+    # create an relation without members
+    content "<osm><relation changeset='#{changeset_id}'><tag k='test' v='yes' /></relation></osm>"
+    put :create
+    # hope for forbidden, due to user
+    assert_response :forbidden, 
+    "relation upload should have failed with forbidden"
+
+    ###
+    # create an relation with a node as member
+    # This time try with a role attribute in the relation
+    nid = current_nodes(:used_node_1).id
+    content "<osm><relation changeset='#{changeset_id}'>" +
+      "<member  ref='#{nid}' type='node' role='some'/>" +
+      "<tag k='test' v='yes' /></relation></osm>"
+    put :create
+    # hope for forbidden due to user
+    assert_response :forbidden, 
+    "relation upload did not return forbidden status"
+    
+    ###
+    # create an relation with a node as member, this time test that we don't 
+    # need a role attribute to be included
+    nid = current_nodes(:used_node_1).id
+    content "<osm><relation changeset='#{changeset_id}'>" +
+      "<member  ref='#{nid}' type='node'/>"+
+      "<tag k='test' v='yes' /></relation></osm>"
+    put :create
+    # hope for forbidden due to user
+    assert_response :forbidden, 
+    "relation upload did not return forbidden status"
+
+    ###
+    # create an relation with a way and a node as members
+    nid = current_nodes(:used_node_1).id
+    wid = current_ways(:used_way).id
+    content "<osm><relation changeset='#{changeset_id}'>" +
+      "<member type='node' ref='#{nid}' role='some'/>" +
+      "<member type='way' ref='#{wid}' role='other'/>" +
+      "<tag k='test' v='yes' /></relation></osm>"
+    put :create
+    # hope for forbidden, due to user
+    assert_response :forbidden, 
+        "relation upload did not return success status"
+
+
+
+    ## Now try with the public user
+    basic_authorization users(:public_user).email, "test"
+    
+    # put the relation in a dummy fixture changset
+    changeset_id = changesets(:public_user_first_change).id
+
     # create an relation without members
     content "<osm><relation changeset='#{changeset_id}'><tag k='test' v='yes' /></relation></osm>"
     put :create
@@ -100,7 +221,7 @@ class RelationControllerTest < ActionController::TestCase
         "saved relation does not contain exactly one tag"
     assert_equal changeset_id, checkrelation.changeset.id,
         "saved relation does not belong in the changeset it was assigned to"
-    assert_equal users(:normal_user).id, checkrelation.changeset.user_id, 
+    assert_equal users(:public_user).id, checkrelation.changeset.user_id, 
         "saved relation does not belong to user that created it"
     assert_equal true, checkrelation.visible, 
         "saved relation is not visible"
@@ -132,7 +253,7 @@ class RelationControllerTest < ActionController::TestCase
         "saved relation does not contain exactly one tag"
     assert_equal changeset_id, checkrelation.changeset.id,
         "saved relation does not belong in the changeset it was assigned to"
-    assert_equal users(:normal_user).id, checkrelation.changeset.user_id, 
+    assert_equal users(:public_user).id, checkrelation.changeset.user_id, 
         "saved relation does not belong to user that created it"
     assert_equal true, checkrelation.visible, 
         "saved relation is not visible"
@@ -165,7 +286,7 @@ class RelationControllerTest < ActionController::TestCase
         "saved relation does not contain exactly one tag"
     assert_equal changeset_id, checkrelation.changeset.id,
         "saved relation does not belong in the changeset it was assigned to"
-    assert_equal users(:normal_user).id, checkrelation.changeset.user_id, 
+    assert_equal users(:public_user).id, checkrelation.changeset.user_id, 
         "saved relation does not belong to user that created it"
     assert_equal true, checkrelation.visible, 
         "saved relation is not visible"
@@ -198,7 +319,7 @@ class RelationControllerTest < ActionController::TestCase
         "saved relation does not contain exactly one tag"
     assert_equal changeset_id, checkrelation.changeset.id,
         "saved relation does not belong in the changeset it was assigned to"
-    assert_equal users(:normal_user).id, checkrelation.changeset.user_id, 
+    assert_equal users(:public_user).id, checkrelation.changeset.user_id, 
         "saved relation does not belong to user that created it"
     assert_equal true, checkrelation.visible, 
         "saved relation is not visible"
@@ -208,15 +329,78 @@ class RelationControllerTest < ActionController::TestCase
 
   end
 
+  # ------------------------------------
+  # Test updating relations
+  # ------------------------------------
+
+  ##
+  # test that, when tags are updated on a relation, the correct things
+  # happen to the correct tables and the API gives sensible results. 
+  # this is to test a case that gregory marler noticed and posted to
+  # josm-dev.
+  ## FIXME Move this to an integration test
+  def test_update_relation_tags
+    basic_authorization "test@example.com", "test"
+    rel_id = current_relations(:multi_tag_relation).id
+    cs_id = changesets(:public_user_first_change).id
+
+    with_relation(rel_id) do |rel|
+      # alter one of the tags
+      tag = rel.find("//osm/relation/tag").first
+      tag['v'] = 'some changed value'
+      update_changeset(rel, cs_id)
+
+      # check that the downloaded tags are the same as the uploaded tags...
+      new_version = with_update(rel) do |new_rel|
+        assert_tags_equal rel, new_rel
+      end
+
+      # check the original one in the current_* table again
+      with_relation(rel_id) { |r| assert_tags_equal rel, r }
+
+      # now check the version in the history
+      with_relation(rel_id, new_version) { |r| assert_tags_equal rel, r }
+    end
+  end
+
+  ##
+  # test that, when tags are updated on a relation when using the diff
+  # upload function, the correct things happen to the correct tables 
+  # and the API gives sensible results. this is to test a case that 
+  # gregory marler noticed and posted to josm-dev.
+  def test_update_relation_tags_via_upload
+    basic_authorization users(:public_user).email, "test"
+    rel_id = current_relations(:multi_tag_relation).id
+    cs_id = changesets(:public_user_first_change).id
+
+    with_relation(rel_id) do |rel|
+      # alter one of the tags
+      tag = rel.find("//osm/relation/tag").first
+      tag['v'] = 'some changed value'
+      update_changeset(rel, cs_id)
+
+      # check that the downloaded tags are the same as the uploaded tags...
+      new_version = with_update_diff(rel) do |new_rel|
+        assert_tags_equal rel, new_rel
+      end
+
+      # check the original one in the current_* table again
+      with_relation(rel_id) { |r| assert_tags_equal rel, r }
+
+      # now check the version in the history
+      with_relation(rel_id, new_version) { |r| assert_tags_equal rel, r }
+    end
+  end
+
   # -------------------------------------
   # Test creating some invalid relations.
   # -------------------------------------
 
   def test_create_invalid
-    basic_authorization "test@openstreetmap.org", "test"
+    basic_authorization users(:public_user).email, "test"
 
     # put the relation in a dummy fixture changset
-    changeset_id = changesets(:normal_user_first_change).id
+    changeset_id = changesets(:public_user_first_change).id
 
     # create a relation with non-existing node as member
     content "<osm><relation changeset='#{changeset_id}'>" +
@@ -226,16 +410,17 @@ class RelationControllerTest < ActionController::TestCase
     # expect failure
     assert_response :precondition_failed, 
         "relation upload with invalid node did not return 'precondition failed'"
+    assert_equal "Precondition failed: Relation with id  cannot be saved due to Node with id 0", @response.body
   end
 
   # -------------------------------------
   # Test creating a relation, with some invalid XML
   # -------------------------------------
   def test_create_invalid_xml
-    basic_authorization "test@openstreetmap.org", "test"
+    basic_authorization users(:public_user).email, "test"
     
     # put the relation in a dummy fixture changeset that works
-    changeset_id = changesets(:normal_user_first_change).id
+    changeset_id = changesets(:public_user_first_change).id
     
     # create some xml that should return an error
     content "<osm><relation changeset='#{changeset_id}'>" +
@@ -254,22 +439,73 @@ class RelationControllerTest < ActionController::TestCase
   # -------------------------------------
   
   def test_delete
-    # first try to delete relation without auth
+    ## First try to delete relation without auth
     delete :delete, :id => current_relations(:visible_relation).id
     assert_response :unauthorized
+    
+    
+    ## Then try with the private user, to make sure that you get a forbidden
+    basic_authorization(users(:normal_user).email, "test")
+    
+    # this shouldn't work, as we should need the payload...
+    delete :delete, :id => current_relations(:visible_relation).id
+    assert_response :forbidden
+
+    # try to delete without specifying a changeset
+    content "<osm><relation id='#{current_relations(:visible_relation).id}'/></osm>"
+    delete :delete, :id => current_relations(:visible_relation).id
+    assert_response :forbidden
+
+    # try to delete with an invalid (closed) changeset
+    content update_changeset(current_relations(:visible_relation).to_xml,
+                             changesets(:normal_user_closed_change).id)
+    delete :delete, :id => current_relations(:visible_relation).id
+    assert_response :forbidden
+
+    # try to delete with an invalid (non-existent) changeset
+    content update_changeset(current_relations(:visible_relation).to_xml,0)
+    delete :delete, :id => current_relations(:visible_relation).id
+    assert_response :forbidden
+
+    # this won't work because the relation is in-use by another relation
+    content(relations(:used_relation).to_xml)
+    delete :delete, :id => current_relations(:used_relation).id
+    assert_response :forbidden
+
+    # this should work when we provide the appropriate payload...
+    content(relations(:visible_relation).to_xml)
+    delete :delete, :id => current_relations(:visible_relation).id
+    assert_response :forbidden
+
+    # this won't work since the relation is already deleted
+    content(relations(:invisible_relation).to_xml)
+    delete :delete, :id => current_relations(:invisible_relation).id
+    assert_response :forbidden
+
+    # this works now because the relation which was using this one 
+    # has been deleted.
+    content(relations(:used_relation).to_xml)
+    delete :delete, :id => current_relations(:used_relation).id
+    assert_response :forbidden
+
+    # this won't work since the relation never existed
+    delete :delete, :id => 0
+    assert_response :forbidden
+
+    
 
-    # now set auth
-    basic_authorization("test@openstreetmap.org", "test");  
+    ## now set auth for the public user
+    basic_authorization(users(:public_user).email, "test");  
 
     # this shouldn't work, as we should need the payload...
     delete :delete, :id => current_relations(:visible_relation).id
     assert_response :bad_request
 
     # try to delete without specifying a changeset
-    content "<osm><relation id='#{current_relations(:visible_relation).id}'/></osm>"
+    content "<osm><relation id='#{current_relations(:visible_relation).id}' version='#{current_relations(:visible_relation).version}' /></osm>"
     delete :delete, :id => current_relations(:visible_relation).id
     assert_response :bad_request
-    assert_match(/You are missing the required changeset in the relation/, @response.body)
+    assert_match(/Changeset id is missing/, @response.body)
 
     # try to delete with an invalid (closed) changeset
     content update_changeset(current_relations(:visible_relation).to_xml,
@@ -282,15 +518,28 @@ class RelationControllerTest < ActionController::TestCase
     delete :delete, :id => current_relations(:visible_relation).id
     assert_response :conflict
 
-    # this won't work because the relation is in-use by another relation
+    # this won't work because the relation is in a changeset owned by someone else
     content(relations(:used_relation).to_xml)
     delete :delete, :id => current_relations(:used_relation).id
+    assert_response :conflict, 
+    "shouldn't be able to delete a relation in a changeset owned by someone else (#{@response.body})"
+
+    # this won't work because the relation in the payload is different to that passed
+    content(relations(:public_used_relation).to_xml)
+    delete :delete, :id => current_relations(:used_relation).id
+    assert_not_equal relations(:public_used_relation).id, current_relations(:used_relation).id
+    assert_response :bad_request, "shouldn't be able to delete a relation when payload is different to the url"
+    
+    # this won't work because the relation is in-use by another relation
+    content(relations(:public_used_relation).to_xml)
+    delete :delete, :id => current_relations(:public_used_relation).id
     assert_response :precondition_failed, 
        "shouldn't be able to delete a relation used in a relation (#{@response.body})"
+    assert_equal "Precondition failed: The relation 5 is used in relation 6.", @response.body
 
     # this should work when we provide the appropriate payload...
-    content(relations(:visible_relation).to_xml)
-    delete :delete, :id => current_relations(:visible_relation).id
+    content(relations(:multi_tag_relation).to_xml)
+    delete :delete, :id => current_relations(:multi_tag_relation).id
     assert_response :success
 
     # valid delete should return the new version number, which should
@@ -302,11 +551,16 @@ class RelationControllerTest < ActionController::TestCase
     content(relations(:invisible_relation).to_xml)
     delete :delete, :id => current_relations(:invisible_relation).id
     assert_response :gone
+    
+    # Public visible relation needs to be deleted
+    content(relations(:public_visible_relation).to_xml)
+    delete :delete, :id => current_relations(:public_visible_relation).id
+    assert_response :success
 
     # this works now because the relation which was using this one 
     # has been deleted.
-    content(relations(:used_relation).to_xml)
-    delete :delete, :id => current_relations(:used_relation).id
+    content(relations(:public_used_relation).to_xml)
+    delete :delete, :id => current_relations(:public_used_relation).id
     assert_response :success, 
        "should be able to delete a relation used in an old relation (#{@response.body})"
 
@@ -321,7 +575,7 @@ class RelationControllerTest < ActionController::TestCase
   def test_tag_modify_bounding_box
     # in current fixtures, relation 5 contains nodes 3 and 5 (node 3
     # indirectly via way 3), so the bbox should be [3,3,5,5].
-    check_changeset_modify([3,3,5,5]) do |changeset_id|
+    check_changeset_modify(BoundingBox.new(3,3,5,5)) do |changeset_id|
       # add a tag to an existing relation
       relation_xml = current_relations(:visible_relation).to_xml
       relation_element = relation_xml.find("//osm/relation").first
@@ -344,23 +598,36 @@ class RelationControllerTest < ActionController::TestCase
   # add a member to a relation and check the bounding box is only that
   # element.
   def test_add_member_bounding_box
-    check_changeset_modify([4,4,4,4]) do |changeset_id|
-      # add node 4 (4,4) to an existing relation
-      relation_xml = current_relations(:visible_relation).to_xml
-      relation_element = relation_xml.find("//osm/relation").first
-      new_member = XML::Node.new("member")
-      new_member['ref'] = current_nodes(:used_node_2).id.to_s
-      new_member['type'] = "node"
-      new_member['role'] = "some_role"
-      relation_element << new_member
+    relation_id = current_relations(:visible_relation).id
+
+    [current_nodes(:used_node_1),
+     current_nodes(:used_node_2),
+     current_ways(:used_way),
+     current_ways(:way_with_versions)
+    ].each_with_index do |element, version|
+      bbox = element.bbox.to_unscaled
+      check_changeset_modify(bbox) do |changeset_id|
+        relation_xml = Relation.find(relation_id).to_xml
+        relation_element = relation_xml.find("//osm/relation").first
+        new_member = XML::Node.new("member")
+        new_member['ref'] = element.id.to_s
+        new_member['type'] = element.class.to_s.downcase
+        new_member['role'] = "some_role"
+        relation_element << new_member
       
-      # update changeset ID to point to new changeset
-      update_changeset(relation_xml, changeset_id)
+        # update changeset ID to point to new changeset
+        update_changeset(relation_xml, changeset_id)
       
-      # upload the change
-      content relation_xml
-      put :update, :id => current_relations(:visible_relation).id
-      assert_response :success, "can't update relation for add node/bbox test"
+        # upload the change
+        content relation_xml
+        put :update, :id => current_relations(:visible_relation).id
+        assert_response :success, "can't update relation for add #{element.class}/bbox test: #{@response.body}"
+
+        # get it back and check the ordering 
+        get :read, :id => relation_id
+        assert_response :success, "can't read back the relation: #{@response.body}"
+        check_ordering(relation_xml, @response.body)
+      end
     end
   end
   
@@ -368,7 +635,7 @@ class RelationControllerTest < ActionController::TestCase
   # remove a member from a relation and check the bounding box is 
   # only that element.
   def test_remove_member_bounding_box
-    check_changeset_modify([5,5,5,5]) do |changeset_id|
+    check_changeset_modify(BoundingBox.new(5,5,5,5)) do |changeset_id|
       # remove node 5 (5,5) from an existing relation
       relation_xml = current_relations(:visible_relation).to_xml
       relation_xml.
@@ -388,11 +655,11 @@ class RelationControllerTest < ActionController::TestCase
   ##
   # check that relations are ordered
   def test_relation_member_ordering
-    basic_authorization("test@openstreetmap.org", "test");  
-
+    basic_authorization(users(:public_user).email, "test")
+    
     doc_str = <<OSM
 <osm>
- <relation changeset='1'>
+ <relation changeset='4'>
   <member ref='1' type='node' role='first'/>
   <member ref='3' type='node' role='second'/>
   <member ref='1' type='way' role='third'/>
@@ -432,16 +699,21 @@ OSM
     get :read, :id => relation_id
     assert_response :success, "can't read back the relation: #{@response.body}"
     check_ordering(doc, @response.body)
+
+    # check the ordering in the history tables:
+    with_controller(OldRelationController.new) do
+      get :version, :id => relation_id, :version => 2
+      assert_response :success, "can't read back version 2 of the relation #{relation_id}"
+      check_ordering(doc, @response.body)
+    end
   end
 
   ## 
   # check that relations can contain duplicate members
   def test_relation_member_duplicates
-    basic_authorization("test@openstreetmap.org", "test");  
-
     doc_str = <<OSM
 <osm>
- <relation changeset='1'>
+ <relation changeset='4'>
   <member ref='1' type='node' role='forward'/>
   <member ref='3' type='node' role='forward'/>
   <member ref='1' type='node' role='forward'/>
@@ -451,6 +723,16 @@ OSM
 OSM
     doc = XML::Parser.string(doc_str).parse
 
+    ## First try with the private user
+    basic_authorization(users(:normal_user).email, "test");  
+
+    content doc
+    put :create
+    assert_response :forbidden
+
+    ## Now try with the public user
+    basic_authorization(users(:public_user).email, "test");  
+
     content doc
     put :create
     assert_response :success, "can't create a relation: #{@response.body}"
@@ -458,10 +740,69 @@ OSM
 
     # get it back and check the ordering
     get :read, :id => relation_id
+    assert_response :success, "can't read back the relation: #{relation_id}"
+    check_ordering(doc, @response.body)
+  end
+
+  ##
+  # test that the ordering of elements in the history is the same as in current.
+  def test_history_ordering
+    doc_str = <<OSM
+<osm>
+ <relation changeset='4'>
+  <member ref='1' type='node' role='forward'/>
+  <member ref='5' type='node' role='forward'/>
+  <member ref='4' type='node' role='forward'/>
+  <member ref='3' type='node' role='forward'/>
+ </relation>
+</osm>
+OSM
+    doc = XML::Parser.string(doc_str).parse
+    basic_authorization(users(:public_user).email, "test");  
+
+    content doc
+    put :create
+    assert_response :success, "can't create a relation: #{@response.body}"
+    relation_id = @response.body.to_i
+
+    # check the ordering in the current tables:
+    get :read, :id => relation_id
     assert_response :success, "can't read back the relation: #{@response.body}"
     check_ordering(doc, @response.body)
+
+    # check the ordering in the history tables:
+    with_controller(OldRelationController.new) do
+      get :version, :id => relation_id, :version => 1
+      assert_response :success, "can't read back version 1 of the relation: #{@response.body}"
+      check_ordering(doc, @response.body)
+    end
   end
 
+  ##
+  # remove all the members from a relation. the result is pretty useless, but
+  # still technically valid.
+  def test_remove_all_members 
+    check_changeset_modify(BoundingBox.new(3,3,5,5)) do |changeset_id|
+      relation_xml = current_relations(:visible_relation).to_xml
+      relation_xml.
+        find("//osm/relation/member").
+        each {|m| m.remove!}
+      
+      # update changeset ID to point to new changeset
+      update_changeset(relation_xml, changeset_id)
+      
+      # upload the change
+      content relation_xml
+      put :update, :id => current_relations(:visible_relation).id
+      assert_response :success, "can't update relation for remove all members test"
+      checkrelation = Relation.find(current_relations(:visible_relation).id)
+      assert_not_nil(checkrelation, 
+                     "uploaded relation not found in database after upload")
+      assert_equal(0, checkrelation.members.length,
+                   "relation contains members but they should have all been deleted")
+    end
+  end
+  
   # ============================================================
   # utility functions
   # ============================================================
@@ -489,8 +830,21 @@ OSM
   # create a changeset and yield to the caller to set it up, then assert
   # that the changeset bounding box is +bbox+.
   def check_changeset_modify(bbox)
-    basic_authorization("test@openstreetmap.org", "test");  
+    ## First test with the private user to check that you get a forbidden
+    basic_authorization(users(:normal_user).email, "test");  
+
+    # create a new changeset for this operation, so we are assured
+    # that the bounding box will be newly-generated.
+    changeset_id = with_controller(ChangesetController.new) do
+      content "<osm><changeset/></osm>"
+      put :create
+      assert_response :forbidden, "shouldn't be able to create changeset for modify test, as should get forbidden"
+    end
 
+    
+    ## Now do the whole thing with the public user
+    basic_authorization(users(:public_user).email, "test")
+    
     # create a new changeset for this operation, so we are assured
     # that the bounding box will be newly-generated.
     changeset_id = with_controller(ChangesetController.new) do
@@ -507,12 +861,107 @@ OSM
     with_controller(ChangesetController.new) do
       get :read, :id => changeset_id
       assert_response :success, "can't re-read changeset for modify test"
-      assert_select "osm>changeset", 1
-      assert_select "osm>changeset[id=#{changeset_id}]", 1
-      assert_select "osm>changeset[min_lon=#{bbox[0].to_f}]", 1
-      assert_select "osm>changeset[min_lat=#{bbox[1].to_f}]", 1
-      assert_select "osm>changeset[max_lon=#{bbox[2].to_f}]", 1
-      assert_select "osm>changeset[max_lat=#{bbox[3].to_f}]", 1
+      assert_select "osm>changeset", 1, "Changeset element doesn't exist in #{@response.body}"
+      assert_select "osm>changeset[id=#{changeset_id}]", 1, "Changeset id=#{changeset_id} doesn't exist in #{@response.body}"
+      assert_select "osm>changeset[min_lon=#{bbox.min_lon}]", 1, "Changeset min_lon wrong in #{@response.body}"
+      assert_select "osm>changeset[min_lat=#{bbox.min_lat}]", 1, "Changeset min_lat wrong in #{@response.body}"
+      assert_select "osm>changeset[max_lon=#{bbox.max_lon}]", 1, "Changeset max_lon wrong in #{@response.body}"
+      assert_select "osm>changeset[max_lat=#{bbox.max_lat}]", 1, "Changeset max_lat wrong in #{@response.body}"
+    end
+  end
+
+  ##
+  # yields the relation with the given +id+ (and optional +version+
+  # to read from the history tables) into the block. the parsed XML
+  # doc is returned.
+  def with_relation(id, ver = nil)
+    if ver.nil?
+      get :read, :id => id
+    else
+      with_controller(OldRelationController.new) do
+        get :version, :id => id, :version => ver
+      end
+    end
+    assert_response :success
+    yield xml_parse(@response.body)
+  end
+
+  ##
+  # updates the relation (XML) +rel+ and 
+  # yields the new version of that relation into the block. 
+  # the parsed XML doc is retured.
+  def with_update(rel)
+    rel_id = rel.find("//osm/relation").first["id"].to_i
+    content rel
+    put :update, :id => rel_id
+    assert_response :success, "can't update relation: #{@response.body}"
+    version = @response.body.to_i
+
+    # now get the new version
+    get :read, :id => rel_id
+    assert_response :success
+    new_rel = xml_parse(@response.body)
+
+    yield new_rel
+
+    return version
+  end
+
+  ##
+  # updates the relation (XML) +rel+ via the diff-upload API and
+  # yields the new version of that relation into the block. 
+  # the parsed XML doc is retured.
+  def with_update_diff(rel)
+    rel_id = rel.find("//osm/relation").first["id"].to_i
+    cs_id = rel.find("//osm/relation").first['changeset'].to_i
+    version = nil
+
+    with_controller(ChangesetController.new) do
+      doc = OSM::API.new.get_xml_doc
+      change = XML::Node.new 'osmChange'
+      doc.root = change
+      modify = XML::Node.new 'modify'
+      change << modify
+      modify << doc.import(rel.find("//osm/relation").first)
+
+      content doc.to_s
+      post :upload, :id => cs_id
+      assert_response :success, "can't upload diff relation: #{@response.body}"
+      version = xml_parse(@response.body).find("//diffResult/relation").first["new_version"].to_i
+    end      
+    
+    # now get the new version
+    get :read, :id => rel_id
+    assert_response :success
+    new_rel = xml_parse(@response.body)
+    
+    yield new_rel
+    
+    return version
+  end
+
+  ##
+  # returns a k->v hash of tags from an xml doc
+  def get_tags_as_hash(a) 
+    a.find("//osm/relation/tag").sort_by { |v| v['k'] }.inject({}) do |h,v|
+      h[v['k']] = v['v']
+      h
+    end
+  end
+  
+  ##
+  # assert that all tags on relation documents +a+ and +b+ 
+  # are equal
+  def assert_tags_equal(a, b)
+    # turn the XML doc into tags hashes
+    a_tags = get_tags_as_hash(a)
+    b_tags = get_tags_as_hash(b)
+
+    assert_equal a_tags.keys, b_tags.keys, "Tag keys should be identical."
+    a_tags.each do |k, v|
+      assert_equal v, b_tags[k], 
+        "Tags which were not altered should be the same. " +
+        "#{a_tags.inspect} != #{b_tags.inspect}"
     end
   end