X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/5652e9f6b95c1e44db597c0136a985aef5e28ad5..98ff2c0b9c28b7a039b55573540f85ea84eb9fca:/test/controllers/api/changesets_controller_test.rb

diff --git a/test/controllers/api/changesets_controller_test.rb b/test/controllers/api/changesets_controller_test.rb
index f3de0682b..be1033ea6 100644
--- a/test/controllers/api/changesets_controller_test.rb
+++ b/test/controllers/api/changesets_controller_test.rb
@@ -21,14 +21,26 @@ module Api
         { :path => "/api/0.6/changeset/1", :method => :get },
         { :controller => "api/changesets", :action => "show", :id => "1" }
       )
+      assert_routing(
+        { :path => "/api/0.6/changeset/1.json", :method => :get },
+        { :controller => "api/changesets", :action => "show", :id => "1", :format => "json" }
+      )
       assert_routing(
         { :path => "/api/0.6/changeset/1/subscribe", :method => :post },
         { :controller => "api/changesets", :action => "subscribe", :id => "1" }
       )
+      assert_routing(
+        { :path => "/api/0.6/changeset/1/subscribe.json", :method => :post },
+        { :controller => "api/changesets", :action => "subscribe", :id => "1", :format => "json" }
+      )
       assert_routing(
         { :path => "/api/0.6/changeset/1/unsubscribe", :method => :post },
         { :controller => "api/changesets", :action => "unsubscribe", :id => "1" }
       )
+      assert_routing(
+        { :path => "/api/0.6/changeset/1/unsubscribe.json", :method => :post },
+        { :controller => "api/changesets", :action => "unsubscribe", :id => "1", :format => "json" }
+      )
       assert_routing(
         { :path => "/api/0.6/changeset/1", :method => :put },
         { :controller => "api/changesets", :action => "update", :id => "1" }
@@ -39,7 +51,11 @@ module Api
       )
       assert_routing(
         { :path => "/api/0.6/changesets", :method => :get },
-        { :controller => "api/changesets", :action => "query" }
+        { :controller => "api/changesets", :action => "index" }
+      )
+      assert_routing(
+        { :path => "/api/0.6/changesets.json", :method => :get },
+        { :controller => "api/changesets", :action => "index", :format => "json" }
       )
     end
 
@@ -118,12 +134,14 @@ module Api
 
     def test_create_wrong_method
       auth_header = basic_authorization_header create(:user).email, "test"
-      assert_raise ActionController::RoutingError do
-        get changeset_create_path, :headers => auth_header
-      end
-      assert_raise ActionController::RoutingError do
-        post changeset_create_path, :headers => auth_header
-      end
+
+      get changeset_create_path, :headers => auth_header
+      assert_response :not_found
+      assert_template "rescues/routing_error"
+
+      post changeset_create_path, :headers => auth_header
+      assert_response :not_found
+      assert_template "rescues/routing_error"
     end
 
     ##
@@ -135,37 +153,243 @@ module Api
       get changeset_show_path(changeset)
       assert_response :success, "cannot get first changeset"
 
-      assert_select "osm[version='#{Settings.api_version}'][generator='OpenStreetMap server']", 1
-      assert_select "osm>changeset[id='#{changeset.id}']", 1
-      assert_select "osm>changeset>@open", "true"
-      assert_select "osm>changeset>@created_at", changeset.created_at.xmlschema
-      assert_select "osm>changeset>@closed_at", 0
+      assert_select "osm[version='#{Settings.api_version}'][generator='#{Settings.generator}']", 1
+      assert_single_changeset changeset
       assert_select "osm>changeset>discussion", 0
 
       get changeset_show_path(changeset), :params => { :include_discussion => true }
       assert_response :success, "cannot get first changeset with comments"
 
-      assert_select "osm[version='#{Settings.api_version}'][generator='OpenStreetMap server']", 1
-      assert_select "osm>changeset[id='#{changeset.id}']", 1
-      assert_select "osm>changeset>@open", "true"
-      assert_select "osm>changeset>@created_at", changeset.created_at.xmlschema
-      assert_select "osm>changeset>@closed_at", 0
+      assert_select "osm[version='#{Settings.api_version}'][generator='#{Settings.generator}']", 1
+      assert_single_changeset changeset
       assert_select "osm>changeset>discussion", 1
       assert_select "osm>changeset>discussion>comment", 0
+    end
 
+    def test_show_comments
+      # all comments visible
       changeset = create(:changeset, :closed)
-      create_list(:changeset_comment, 3, :changeset_id => changeset.id)
+      comment1, comment2, comment3 = create_list(:changeset_comment, 3, :changeset_id => changeset.id)
 
       get changeset_show_path(changeset), :params => { :include_discussion => true }
       assert_response :success, "cannot get closed changeset with comments"
 
-      assert_select "osm[version='#{Settings.api_version}'][generator='OpenStreetMap server']", 1
-      assert_select "osm>changeset[id='#{changeset.id}']", 1
-      assert_select "osm>changeset>@open", "false"
-      assert_select "osm>changeset>@created_at", changeset.created_at.xmlschema
-      assert_select "osm>changeset>@closed_at", changeset.closed_at.xmlschema
+      assert_select "osm[version='#{Settings.api_version}'][generator='#{Settings.generator}']", 1
+      assert_single_changeset changeset
+      assert_select "osm>changeset>discussion", 1
+      assert_select "osm>changeset>discussion>comment", 3
+      assert_select "osm>changeset>discussion>comment:nth-child(1)>@id", comment1.id.to_s
+      assert_select "osm>changeset>discussion>comment:nth-child(1)>@visible", "true"
+      assert_select "osm>changeset>discussion>comment:nth-child(2)>@id", comment2.id.to_s
+      assert_select "osm>changeset>discussion>comment:nth-child(2)>@visible", "true"
+      assert_select "osm>changeset>discussion>comment:nth-child(3)>@id", comment3.id.to_s
+      assert_select "osm>changeset>discussion>comment:nth-child(3)>@visible", "true"
+
+      # one hidden comment not included because not asked for
+      comment2.update(:visible => false)
+
+      get changeset_show_path(changeset), :params => { :include_discussion => true }
+      assert_response :success, "cannot get closed changeset with comments"
+
+      assert_select "osm[version='#{Settings.api_version}'][generator='#{Settings.generator}']", 1
+      assert_single_changeset changeset
+      assert_select "osm>changeset>discussion", 1
+      assert_select "osm>changeset>discussion>comment", 2
+      assert_select "osm>changeset>discussion>comment:nth-child(1)>@id", comment1.id.to_s
+      assert_select "osm>changeset>discussion>comment:nth-child(1)>@visible", "true"
+      assert_select "osm>changeset>discussion>comment:nth-child(2)>@id", comment3.id.to_s
+      assert_select "osm>changeset>discussion>comment:nth-child(2)>@visible", "true"
+
+      # one hidden comment not included because no permissions
+      get changeset_show_path(changeset), :params => { :include_discussion => true, :show_hidden_comments => true }
+      assert_response :success, "cannot get closed changeset with comments"
+
+      assert_select "osm[version='#{Settings.api_version}'][generator='#{Settings.generator}']", 1
+      assert_single_changeset changeset
+      assert_select "osm>changeset>discussion", 1
+      assert_select "osm>changeset>discussion>comment", 2
+      assert_select "osm>changeset>discussion>comment:nth-child(1)>@id", comment1.id.to_s
+      assert_select "osm>changeset>discussion>comment:nth-child(1)>@visible", "true"
+      # maybe will show an empty comment element with visible=false in the future
+      assert_select "osm>changeset>discussion>comment:nth-child(2)>@id", comment3.id.to_s
+      assert_select "osm>changeset>discussion>comment:nth-child(2)>@visible", "true"
+
+      # one hidden comment shown to moderators
+      moderator_user = create(:moderator_user)
+      auth_header = basic_authorization_header moderator_user.email, "test"
+      get changeset_show_path(changeset), :params => { :include_discussion => true, :show_hidden_comments => true },
+                                          :headers => auth_header
+      assert_response :success, "cannot get closed changeset with comments"
+
+      assert_select "osm[version='#{Settings.api_version}'][generator='#{Settings.generator}']", 1
+      assert_single_changeset changeset
       assert_select "osm>changeset>discussion", 1
       assert_select "osm>changeset>discussion>comment", 3
+      assert_select "osm>changeset>discussion>comment:nth-child(1)>@id", comment1.id.to_s
+      assert_select "osm>changeset>discussion>comment:nth-child(1)>@visible", "true"
+      assert_select "osm>changeset>discussion>comment:nth-child(2)>@id", comment2.id.to_s
+      assert_select "osm>changeset>discussion>comment:nth-child(2)>@visible", "false"
+      assert_select "osm>changeset>discussion>comment:nth-child(3)>@id", comment3.id.to_s
+      assert_select "osm>changeset>discussion>comment:nth-child(3)>@visible", "true"
+    end
+
+    def test_show_json
+      changeset = create(:changeset)
+
+      get changeset_show_path(changeset), :params => { :format => "json" }
+      assert_response :success, "cannot get first changeset"
+
+      js = ActiveSupport::JSON.decode(@response.body)
+      assert_not_nil js
+
+      assert_equal Settings.api_version, js["version"]
+      assert_equal Settings.generator, js["generator"]
+      assert_single_changeset_json changeset, js
+      assert_nil js["changeset"]["tags"]
+      assert_nil js["changeset"]["comments"]
+      assert_equal changeset.user.id, js["changeset"]["uid"]
+      assert_equal changeset.user.display_name, js["changeset"]["user"]
+
+      get changeset_show_path(changeset), :params => { :format => "json", :include_discussion => true }
+      assert_response :success, "cannot get first changeset with comments"
+
+      js = ActiveSupport::JSON.decode(@response.body)
+      assert_not_nil js
+      assert_equal Settings.api_version, js["version"]
+      assert_equal Settings.generator, js["generator"]
+      assert_single_changeset_json changeset, js
+      assert_nil js["changeset"]["tags"]
+      assert_nil js["changeset"]["min_lat"]
+      assert_nil js["changeset"]["min_lon"]
+      assert_nil js["changeset"]["max_lat"]
+      assert_nil js["changeset"]["max_lon"]
+      assert_equal 0, js["changeset"]["comments"].count
+    end
+
+    def test_show_comments_json
+      # all comments visible
+      changeset = create(:changeset, :closed)
+      comment0, comment1, comment2 = create_list(:changeset_comment, 3, :changeset_id => changeset.id)
+
+      get changeset_show_path(changeset), :params => { :format => "json", :include_discussion => true }
+      assert_response :success, "cannot get closed changeset with comments"
+
+      js = ActiveSupport::JSON.decode(@response.body)
+      assert_not_nil js
+      assert_equal Settings.api_version, js["version"]
+      assert_equal Settings.generator, js["generator"]
+      assert_single_changeset_json changeset, js
+      assert_equal 3, js["changeset"]["comments"].count
+      assert_equal comment0.id, js["changeset"]["comments"][0]["id"]
+      assert js["changeset"]["comments"][0]["visible"]
+      assert_equal comment1.id, js["changeset"]["comments"][1]["id"]
+      assert js["changeset"]["comments"][1]["visible"]
+      assert_equal comment2.id, js["changeset"]["comments"][2]["id"]
+      assert js["changeset"]["comments"][2]["visible"]
+
+      # one hidden comment not included because not asked for
+      comment1.update(:visible => false)
+
+      get changeset_show_path(changeset), :params => { :format => "json", :include_discussion => true }
+      assert_response :success, "cannot get closed changeset with comments"
+
+      js = ActiveSupport::JSON.decode(@response.body)
+      assert_not_nil js
+      assert_equal Settings.api_version, js["version"]
+      assert_equal Settings.generator, js["generator"]
+      assert_single_changeset_json changeset, js
+      assert_equal 2, js["changeset"]["comments"].count
+      assert_equal comment0.id, js["changeset"]["comments"][0]["id"]
+      assert js["changeset"]["comments"][0]["visible"]
+      assert_equal comment2.id, js["changeset"]["comments"][1]["id"]
+      assert js["changeset"]["comments"][1]["visible"]
+
+      # one hidden comment not included because no permissions
+      get changeset_show_path(changeset), :params => { :format => "json", :include_discussion => true, :show_hidden_comments => true }
+      assert_response :success, "cannot get closed changeset with comments"
+
+      js = ActiveSupport::JSON.decode(@response.body)
+      assert_not_nil js
+      assert_equal Settings.api_version, js["version"]
+      assert_equal Settings.generator, js["generator"]
+      assert_single_changeset_json changeset, js
+      assert_equal 2, js["changeset"]["comments"].count
+      assert_equal comment0.id, js["changeset"]["comments"][0]["id"]
+      assert js["changeset"]["comments"][0]["visible"]
+      # maybe will show an empty comment element with visible=false in the future
+      assert_equal comment2.id, js["changeset"]["comments"][1]["id"]
+      assert js["changeset"]["comments"][1]["visible"]
+
+      # one hidden comment shown to moderators
+      moderator_user = create(:moderator_user)
+      auth_header = basic_authorization_header moderator_user.email, "test"
+      get changeset_show_path(changeset), :params => { :format => "json", :include_discussion => true, :show_hidden_comments => true },
+                                          :headers => auth_header
+      assert_response :success, "cannot get closed changeset with comments"
+
+      js = ActiveSupport::JSON.decode(@response.body)
+      assert_not_nil js
+      assert_equal Settings.api_version, js["version"]
+      assert_equal Settings.generator, js["generator"]
+      assert_single_changeset_json changeset, js
+      assert_equal 3, js["changeset"]["comments"].count
+      assert_equal comment0.id, js["changeset"]["comments"][0]["id"]
+      assert js["changeset"]["comments"][0]["visible"]
+      assert_equal comment1.id, js["changeset"]["comments"][1]["id"]
+      assert_not js["changeset"]["comments"][1]["visible"]
+      assert_equal comment2.id, js["changeset"]["comments"][2]["id"]
+      assert js["changeset"]["comments"][2]["visible"]
+    end
+
+    def test_show_tag_and_discussion_json
+      changeset = create(:changeset, :closed)
+
+      tag1 = ChangesetTag.new
+      tag1.changeset_id = changeset.id
+      tag1.k = "created_by"
+      tag1.v = "JOSM/1.5 (18364)"
+
+      tag2 = ChangesetTag.new
+      tag2.changeset_id = changeset.id
+      tag2.k = "comment"
+      tag2.v = "changeset comment"
+
+      changeset.changeset_tags = [tag1, tag2]
+
+      create_list(:changeset_comment, 3, :changeset_id => changeset.id)
+
+      get changeset_show_path(changeset), :params => { :format => "json", :include_discussion => true }
+      assert_response :success, "cannot get closed changeset with comments"
+
+      js = ActiveSupport::JSON.decode(@response.body)
+
+      assert_not_nil js
+      assert_equal Settings.api_version, js["version"]
+      assert_equal Settings.generator, js["generator"]
+      assert_single_changeset_json changeset, js
+      assert_equal 2, js["changeset"]["tags"].count
+      assert_equal 3, js["changeset"]["comments"].count
+      assert_equal 3, js["changeset"]["comments_count"]
+      assert_equal 0, js["changeset"]["changes_count"]
+      assert_not_nil js["changeset"]["comments"][0]["uid"]
+      assert_not_nil js["changeset"]["comments"][0]["user"]
+      assert_not_nil js["changeset"]["comments"][0]["text"]
+    end
+
+    def test_show_bbox_json
+      # test bbox attribute
+      changeset = create(:changeset, :min_lat => (-5 * GeoRecord::SCALE).round, :min_lon => (5 * GeoRecord::SCALE).round,
+                                     :max_lat => (15 * GeoRecord::SCALE).round, :max_lon => (12 * GeoRecord::SCALE).round)
+
+      get changeset_show_path(changeset), :params => { :format => "json" }
+      assert_response :success, "cannot get first changeset"
+
+      js = ActiveSupport::JSON.decode(@response.body)
+      assert_not_nil js
+      assert_equal(-5, js["changeset"]["min_lat"])
+      assert_equal 5, js["changeset"]["min_lon"]
+      assert_equal 15, js["changeset"]["max_lat"]
+      assert_equal 12, js["changeset"]["max_lon"]
     end
 
     ##
@@ -205,8 +429,8 @@ module Api
 
       # test that it really is closed now
       cs = Changeset.find(changeset.id)
-      assert_not(cs.is_open?,
-                 "changeset should be closed now (#{cs.closed_at} > #{Time.now.getutc}.")
+      assert_not(cs.open?,
+                 "changeset should be closed now (#{cs.closed_at} > #{Time.now.utc}.")
     end
 
     ##
@@ -230,13 +454,13 @@ module Api
 
       auth_header = basic_authorization_header user.email, "test"
 
-      assert_raise ActionController::RoutingError do
-        get changeset_close_path(changeset), :headers => auth_header
-      end
+      get changeset_close_path(changeset), :headers => auth_header
+      assert_response :not_found
+      assert_template "rescues/routing_error"
 
-      assert_raise ActionController::RoutingError do
-        post changeset_close_path(changeset), :headers => auth_header
-      end
+      post changeset_close_path(changeset), :headers => auth_header
+      assert_response :not_found
+      assert_template "rescues/routing_error"
     end
 
     ##
@@ -412,7 +636,7 @@ module Api
                       "can't upload a simple valid creation to changeset: #{@response.body}"
 
       # check the returned payload
-      assert_select "diffResult[version='#{Settings.api_version}'][generator='OpenStreetMap server']", 1
+      assert_select "diffResult[version='#{Settings.api_version}'][generator='#{Settings.generator}']", 1
       assert_select "diffResult>node", 1
       assert_select "diffResult>way", 1
       assert_select "diffResult>relation", 1
@@ -566,10 +790,10 @@ module Api
 
       # check that the changeset bbox is within bounds
       cs = Changeset.find(changeset_id)
-      assert cs.min_lon >= -180 * GeoRecord::SCALE, "Minimum longitude (#{cs.min_lon / GeoRecord::SCALE}) should be >= -180 to be valid."
-      assert cs.max_lon <= 180 * GeoRecord::SCALE, "Maximum longitude (#{cs.max_lon / GeoRecord::SCALE}) should be <= 180 to be valid."
-      assert cs.min_lat >= -90 * GeoRecord::SCALE, "Minimum latitude (#{cs.min_lat / GeoRecord::SCALE}) should be >= -90 to be valid."
-      assert cs.max_lat <= 90 * GeoRecord::SCALE, "Maximum latitude (#{cs.max_lat / GeoRecord::SCALE}) should be <= 90 to be valid."
+      assert_operator cs.min_lon, :>=, -180 * GeoRecord::SCALE, "Minimum longitude (#{cs.min_lon / GeoRecord::SCALE}) should be >= -180 to be valid."
+      assert_operator cs.max_lon, :<=, 180 * GeoRecord::SCALE, "Maximum longitude (#{cs.max_lon / GeoRecord::SCALE}) should be <= 180 to be valid."
+      assert_operator cs.min_lat, :>=, -90 * GeoRecord::SCALE, "Minimum latitude (#{cs.min_lat / GeoRecord::SCALE}) should be >= -90 to be valid."
+      assert_operator cs.max_lat, :<=, 90 * GeoRecord::SCALE, "Maximum latitude (#{cs.max_lat / GeoRecord::SCALE}) should be <= 90 to be valid."
     end
 
     ##
@@ -650,7 +874,7 @@ module Api
                       "can't do a conditional delete of in use objects: #{@response.body}"
 
       # check the returned payload
-      assert_select "diffResult[version='#{Settings.api_version}'][generator='OpenStreetMap server']", 1
+      assert_select "diffResult[version='#{Settings.api_version}'][generator='#{Settings.generator}']", 1
       assert_select "diffResult>node", 1
       assert_select "diffResult>way", 1
       assert_select "diffResult>relation", 1
@@ -1003,12 +1227,96 @@ module Api
         </osmChange>
       CHANGESET
 
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :bad_request,
+                      "shouldn't be able to re-use placeholder IDs"
+
+      # placeholder_ids must be unique across all action blocks
+      diff = <<~CHANGESET
+        <osmChange>
+         <create>
+          <node id='-1' lon='0' lat='0' changeset='#{changeset.id}' version='1'/>
+         </create>
+         <create>
+          <node id='-1' lon='1' lat='1' changeset='#{changeset.id}' version='1'/>
+         </create>
+        </osmChange>
+      CHANGESET
+
       # upload it
       post changeset_upload_path(changeset), :params => diff, :headers => auth_header
       assert_response :bad_request,
                       "shouldn't be able to re-use placeholder IDs"
     end
 
+    def test_upload_process_order
+      changeset = create(:changeset)
+
+      auth_header = basic_authorization_header changeset.user.email, "test"
+
+      diff = <<~CHANGESET
+        <osmChange>
+        <create>
+          <node id="-1" lat="1" lon="2" changeset="#{changeset.id}"/>
+          <way id="-1" changeset="#{changeset.id}">
+              <nd ref="-1"/>
+              <nd ref="-2"/>
+          </way>
+          <node id="-2" lat="1" lon="2" changeset="#{changeset.id}"/>
+        </create>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :bad_request,
+                      "shouldn't refer elements behind it"
+    end
+
+    def test_upload_duplicate_delete
+      changeset = create(:changeset)
+
+      auth_header = basic_authorization_header changeset.user.email, "test"
+
+      diff = <<~CHANGESET
+        <osmChange>
+          <create>
+            <node id="-1" lat="39" lon="116" changeset="#{changeset.id}" />
+          </create>
+          <delete>
+            <node id="-1" version="1" changeset="#{changeset.id}" />
+            <node id="-1" version="1" changeset="#{changeset.id}" />
+          </delete>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :gone,
+                      "transaction should be cancelled by second deletion"
+
+      diff = <<~CHANGESET
+        <osmChange>
+          <create>
+            <node id="-1" lat="39" lon="116" changeset="#{changeset.id}" />
+          </create>
+          <delete if-unused="true">
+            <node id="-1" version="1" changeset="#{changeset.id}" />
+            <node id="-1" version="1" changeset="#{changeset.id}" />
+          </delete>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+
+      assert_select "diffResult>node", 3
+      assert_select "diffResult>node[old_id='-1']", 3
+      assert_select "diffResult>node[new_version='1']", 1
+      assert_select "diffResult>node[new_version='2']", 1
+    end
+
     ##
     # test that uploading a way referencing invalid placeholders gives a
     # proper error, not a 500.
@@ -1237,11 +1545,259 @@ module Api
                       "failed to return error in XML format"
 
       # check the returned payload
-      assert_select "osmError[version='#{Settings.api_version}'][generator='OpenStreetMap server']", 1
+      assert_select "osmError[version='#{Settings.api_version}'][generator='#{Settings.generator}']", 1
       assert_select "osmError>status", 1
       assert_select "osmError>message", 1
     end
 
+    def test_upload_not_found
+      changeset = create(:changeset)
+
+      auth_header = basic_authorization_header changeset.user.email, "test"
+
+      # modify node
+      diff = <<~CHANGESET
+        <osmChange>
+        <modify>
+          <node id='-1' lon='0' lat='0' changeset='#{changeset.id}' version='1'/>
+        </modify>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :not_found, "Node should not be found"
+
+      # modify way
+      diff = <<~CHANGESET
+        <osmChange>
+        <modify>
+          <way id='-1' lon='0' lat='0' changeset='#{changeset.id}' version='1'/>
+        </modify>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :not_found, "Way should not be found"
+
+      # modify relation
+      diff = <<~CHANGESET
+        <osmChange>
+        <modify>
+          <relation id='-1' lon='0' lat='0' changeset='#{changeset.id}' version='1'/>
+        </modify>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :not_found, "Relation should not be found"
+
+      # delete node
+      diff = <<~CHANGESET
+        <osmChange>
+        <delete>
+          <node id='-1' lon='0' lat='0' changeset='#{changeset.id}' version='1'/>
+        </delete>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :not_found, "Node should not be deleted"
+
+      # delete way
+      diff = <<~CHANGESET
+        <osmChange>
+        <delete>
+          <way id='-1' lon='0' lat='0' changeset='#{changeset.id}' version='1'/>
+        </delete>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :not_found, "Way should not be deleted"
+
+      # delete relation
+      diff = <<~CHANGESET
+        <osmChange>
+        <delete>
+          <relation id='-1' lon='0' lat='0' changeset='#{changeset.id}' version='1'/>
+        </delete>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :not_found, "Relation should not be deleted"
+    end
+
+    def test_upload_relation_placeholder_not_fix
+      changeset = create(:changeset)
+
+      auth_header = basic_authorization_header changeset.user.email, "test"
+
+      # modify node
+      diff = <<~CHANGESET
+        <osmChange version='0.6'>
+          <create>
+            <relation id='-2' version='0' changeset='#{changeset.id}'>
+              <member type='relation' role='' ref='-4' />
+              <tag k='type' v='route' />
+              <tag k='name' v='AtoB' />
+            </relation>
+            <relation id='-3' version='0' changeset='#{changeset.id}'>
+              <tag k='type' v='route' />
+              <tag k='name' v='BtoA' />
+            </relation>
+            <relation id='-4' version='0' changeset='#{changeset.id}'>
+              <member type='relation' role='' ref='-2' />
+              <member type='relation' role='' ref='-3' />
+              <tag k='type' v='route_master' />
+              <tag k='name' v='master' />
+            </relation>
+          </create>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff.to_s, :headers => auth_header
+      assert_response :bad_request, "shouldn't be able to use reference -4 in relation -2: #{@response.body}"
+      assert_equal "Placeholder Relation not found for reference -4 in relation -2.", @response.body
+    end
+
+    def test_upload_multiple_delete_block
+      changeset = create(:changeset)
+
+      auth_header = basic_authorization_header changeset.user.email, "test"
+
+      node = create(:node)
+      way = create(:way)
+      create(:way_node, :way => way, :node => node)
+      alone_node = create(:node)
+
+      # modify node
+      diff = <<~CHANGESET
+        <osmChange version='0.6'>
+          <delete version="0.6">
+            <node id="#{node.id}" version="#{node.version}" changeset="#{changeset.id}"/>
+          </delete>
+          <delete version="0.6" if-unused="true">
+            <node id="#{alone_node.id}" version="#{alone_node.version}" changeset="#{changeset.id}"/>
+          </delete>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff.to_s, :headers => auth_header
+      assert_response :precondition_failed,
+                      "shouldn't be able to upload a invalid deletion diff: #{@response.body}"
+      assert_equal "Precondition failed: Node #{node.id} is still used by ways #{way.id}.", @response.body
+    end
+
+    ##
+    # test initial rate limit
+    def test_upload_initial_rate_limit
+      # create a user
+      user = create(:user)
+
+      # create some objects to use
+      node = create(:node)
+      way = create(:way_with_nodes, :nodes_count => 2)
+      relation = create(:relation)
+
+      # create a changeset that puts us near the initial rate limit
+      changeset = create(:changeset, :user => user,
+                                     :created_at => Time.now.utc - 5.minutes,
+                                     :num_changes => Settings.initial_changes_per_hour - 2)
+
+      # create authentication header
+      auth_header = basic_authorization_header user.email, "test"
+
+      # simple diff to create a node way and relation using placeholders
+      diff = <<~CHANGESET
+        <osmChange>
+         <create>
+          <node id='-1' lon='0' lat='0' changeset='#{changeset.id}'>
+           <tag k='foo' v='bar'/>
+           <tag k='baz' v='bat'/>
+          </node>
+          <way id='-1' changeset='#{changeset.id}'>
+           <nd ref='#{node.id}'/>
+          </way>
+         </create>
+         <create>
+          <relation id='-1' changeset='#{changeset.id}'>
+           <member type='way' role='some' ref='#{way.id}'/>
+           <member type='node' role='some' ref='#{node.id}'/>
+           <member type='relation' role='some' ref='#{relation.id}'/>
+          </relation>
+         </create>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :too_many_requests, "upload did not hit rate limit"
+    end
+
+    ##
+    # test maximum rate limit
+    def test_upload_maximum_rate_limit
+      # create a user
+      user = create(:user)
+
+      # create some objects to use
+      node = create(:node)
+      way = create(:way_with_nodes, :nodes_count => 2)
+      relation = create(:relation)
+
+      # create a changeset to establish our initial edit time
+      changeset = create(:changeset, :user => user,
+                                     :created_at => Time.now.utc - 28.days)
+
+      # create changeset to put us near the maximum rate limit
+      total_changes = Settings.max_changes_per_hour - 2
+      while total_changes.positive?
+        changes = [total_changes, Changeset::MAX_ELEMENTS].min
+        changeset = create(:changeset, :user => user,
+                                       :created_at => Time.now.utc - 5.minutes,
+                                       :num_changes => changes)
+        total_changes -= changes
+      end
+
+      # create authentication header
+      auth_header = basic_authorization_header user.email, "test"
+
+      # simple diff to create a node way and relation using placeholders
+      diff = <<~CHANGESET
+        <osmChange>
+         <create>
+          <node id='-1' lon='0' lat='0' changeset='#{changeset.id}'>
+           <tag k='foo' v='bar'/>
+           <tag k='baz' v='bat'/>
+          </node>
+          <way id='-1' changeset='#{changeset.id}'>
+           <nd ref='#{node.id}'/>
+          </way>
+         </create>
+         <create>
+          <relation id='-1' changeset='#{changeset.id}'>
+           <member type='way' role='some' ref='#{way.id}'/>
+           <member type='node' role='some' ref='#{node.id}'/>
+           <member type='relation' role='some' ref='#{relation.id}'/>
+          </relation>
+         </create>
+        </osmChange>
+      CHANGESET
+
+      # upload it
+      post changeset_upload_path(changeset), :params => diff, :headers => auth_header
+      assert_response :too_many_requests, "upload did not hit rate limit"
+    end
+
     ##
     # when we make some simple changes we get the same changes back from the
     # diff download.
@@ -1428,7 +1984,7 @@ module Api
       get changeset_download_path(changeset)
 
       assert_response :success
-      # print @response.body
+
       # FIXME: needs more assert_select tests
       assert_select "osmChange[version='#{Settings.api_version}'][generator='#{Settings.generator}']" do
         assert_select "create", :count => 5
@@ -1439,6 +1995,40 @@ module Api
       end
     end
 
+    test "sorts downloaded elements by timestamp" do
+      changeset = create(:changeset)
+      node1 = create(:old_node, :version => 2, :timestamp => "2020-02-01", :changeset => changeset)
+      node0 = create(:old_node, :version => 2, :timestamp => "2020-01-01", :changeset => changeset)
+
+      get changeset_download_path(changeset)
+      assert_response :success
+      assert_dom "modify", :count => 2 do |modify|
+        assert_dom modify[0], ">node", :count => 1 do |node|
+          assert_dom node, ">@id", node0.node_id.to_s
+        end
+        assert_dom modify[1], ">node", :count => 1 do |node|
+          assert_dom node, ">@id", node1.node_id.to_s
+        end
+      end
+    end
+
+    test "sorts downloaded elements by version" do
+      changeset = create(:changeset)
+      node1 = create(:old_node, :version => 3, :timestamp => "2020-01-01", :changeset => changeset)
+      node0 = create(:old_node, :version => 2, :timestamp => "2020-01-01", :changeset => changeset)
+
+      get changeset_download_path(changeset)
+      assert_response :success
+      assert_dom "modify", :count => 2 do |modify|
+        assert_dom modify[0], ">node", :count => 1 do |node|
+          assert_dom node, ">@id", node0.node_id.to_s
+        end
+        assert_dom modify[1], ">node", :count => 1 do |node|
+          assert_dom node, ">@id", node1.node_id.to_s
+        end
+      end
+    end
+
     ##
     # check that the bounding box of a changeset gets updated correctly
     # FIXME: This should really be moded to a integration test due to the with_controller
@@ -1523,8 +2113,10 @@ module Api
       # not found when looking for changesets of non-existing users
       get changesets_path(:user => User.maximum(:id) + 1)
       assert_response :not_found
+      assert_equal "text/plain", @response.media_type
       get changesets_path(:display_name => " ")
       assert_response :not_found
+      assert_equal "text/plain", @response.media_type
 
       # can't get changesets of user 1 without authenticating
       get changesets_path(:user => private_user.id)
@@ -1542,6 +2134,17 @@ module Api
       assert_response :success, "can't get changesets by user name"
       assert_changesets [private_user_changeset, private_user_closed_changeset]
 
+      # test json endpoint
+      get changesets_path(:display_name => private_user.display_name), :headers => auth_header, :params => { :format => "json" }
+      assert_response :success, "can't get changesets by user name"
+
+      js = ActiveSupport::JSON.decode(@response.body)
+      assert_not_nil js
+
+      assert_equal Settings.api_version, js["version"]
+      assert_equal Settings.generator, js["generator"]
+      assert_equal 2, js["changesets"].count
+
       # check that the correct error is given when we provide both UID and name
       get changesets_path(:user => private_user.id,
                           :display_name => private_user.display_name), :headers => auth_header
@@ -1587,6 +2190,117 @@ module Api
       assert_response :bad_request, "should be a bad request since changesets is empty"
     end
 
+    ##
+    # test the query functionality of changesets with the limit parameter
+    def test_query_limit
+      user = create(:user)
+      changeset1 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 1, 1, 0, 0, 0), :closed_at => Time.utc(2008, 1, 2, 0, 0, 0))
+      changeset2 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 2, 1, 0, 0, 0), :closed_at => Time.utc(2008, 2, 2, 0, 0, 0))
+      changeset3 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 3, 1, 0, 0, 0), :closed_at => Time.utc(2008, 3, 2, 0, 0, 0))
+      changeset4 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 4, 1, 0, 0, 0), :closed_at => Time.utc(2008, 4, 2, 0, 0, 0))
+      changeset5 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 5, 1, 0, 0, 0), :closed_at => Time.utc(2008, 5, 2, 0, 0, 0))
+
+      get changesets_path
+      assert_response :success
+      assert_changesets_in_order [changeset5, changeset4, changeset3, changeset2, changeset1]
+
+      get changesets_path(:limit => "3")
+      assert_response :success
+      assert_changesets_in_order [changeset5, changeset4, changeset3]
+
+      get changesets_path(:limit => "0")
+      assert_response :bad_request
+
+      get changesets_path(:limit => Settings.max_changeset_query_limit)
+      assert_response :success
+      assert_changesets_in_order [changeset5, changeset4, changeset3, changeset2, changeset1]
+
+      get changesets_path(:limit => Settings.max_changeset_query_limit + 1)
+      assert_response :bad_request
+    end
+
+    ##
+    # test the query functionality of sequential changesets with order and time parameters
+    def test_query_order
+      user = create(:user)
+      changeset1 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 1, 1, 0, 0, 0), :closed_at => Time.utc(2008, 1, 2, 0, 0, 0))
+      changeset2 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 2, 1, 0, 0, 0), :closed_at => Time.utc(2008, 2, 2, 0, 0, 0))
+      changeset3 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 3, 1, 0, 0, 0), :closed_at => Time.utc(2008, 3, 2, 0, 0, 0))
+      changeset4 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 4, 1, 0, 0, 0), :closed_at => Time.utc(2008, 4, 2, 0, 0, 0))
+      changeset5 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 5, 1, 0, 0, 0), :closed_at => Time.utc(2008, 5, 2, 0, 0, 0))
+      changeset6 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2008, 6, 1, 0, 0, 0), :closed_at => Time.utc(2008, 6, 2, 0, 0, 0))
+
+      get changesets_path
+      assert_response :success
+      assert_changesets_in_order [changeset6, changeset5, changeset4, changeset3, changeset2, changeset1]
+
+      get changesets_path(:order => "oldest")
+      assert_response :success
+      assert_changesets_in_order [changeset1, changeset2, changeset3, changeset4, changeset5, changeset6]
+
+      [
+        # lower time bound at the opening time of a changeset
+        ["2008-02-01T00:00:00Z", "2008-05-15T00:00:00Z", [changeset5, changeset4, changeset3, changeset2], [changeset5, changeset4, changeset3, changeset2]],
+        # lower time bound in the middle of a changeset
+        ["2008-02-01T12:00:00Z", "2008-05-15T00:00:00Z", [changeset5, changeset4, changeset3, changeset2], [changeset5, changeset4, changeset3]],
+        # lower time bound at the closing time of a changeset
+        ["2008-02-02T00:00:00Z", "2008-05-15T00:00:00Z", [changeset5, changeset4, changeset3, changeset2], [changeset5, changeset4, changeset3]],
+        # lower time bound after the closing time of a changeset
+        ["2008-02-02T00:00:01Z", "2008-05-15T00:00:00Z", [changeset5, changeset4, changeset3], [changeset5, changeset4, changeset3]],
+        # upper time bound in the middle of a changeset
+        ["2007-09-09T12:00:00Z", "2008-04-01T12:00:00Z", [changeset4, changeset3, changeset2, changeset1], [changeset4, changeset3, changeset2, changeset1]],
+        # empty range
+        ["2009-02-02T00:00:01Z", "2018-05-15T00:00:00Z", [], []]
+      ].each do |from, to, interval_changesets, point_changesets|
+        get changesets_path(:time => "#{from},#{to}")
+        assert_response :success
+        assert_changesets_in_order interval_changesets
+
+        get changesets_path(:from => from, :to => to)
+        assert_response :success
+        assert_changesets_in_order point_changesets
+
+        get changesets_path(:from => from, :to => to, :order => "oldest")
+        assert_response :success
+        assert_changesets_in_order point_changesets.reverse
+      end
+    end
+
+    ##
+    # test the query functionality of overlapping changesets with order and time parameters
+    def test_query_order_overlapping
+      user = create(:user)
+      changeset1 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2015, 6, 4, 17, 0, 0), :closed_at => Time.utc(2015, 6, 4, 17, 0, 0))
+      changeset2 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2015, 6, 4, 16, 0, 0), :closed_at => Time.utc(2015, 6, 4, 18, 0, 0))
+      changeset3 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2015, 6, 4, 14, 0, 0), :closed_at => Time.utc(2015, 6, 4, 20, 0, 0))
+      changeset4 = create(:changeset, :closed, :user => user, :created_at => Time.utc(2015, 6, 3, 23, 0, 0), :closed_at => Time.utc(2015, 6, 4, 23, 0, 0))
+      create(:changeset, :closed, :user => user, :created_at => Time.utc(2015, 6, 2, 23, 0, 0), :closed_at => Time.utc(2015, 6, 3, 23, 0, 0))
+
+      get changesets_path(:time => "2015-06-04T00:00:00Z")
+      assert_response :success
+      assert_changesets_in_order [changeset1, changeset2, changeset3, changeset4]
+
+      get changesets_path(:from => "2015-06-04T00:00:00Z")
+      assert_response :success
+      assert_changesets_in_order [changeset1, changeset2, changeset3]
+
+      get changesets_path(:from => "2015-06-04T00:00:00Z", :order => "oldest")
+      assert_response :success
+      assert_changesets_in_order [changeset3, changeset2, changeset1]
+
+      get changesets_path(:time => "2015-06-04T16:00:00Z,2015-06-04T17:30:00Z")
+      assert_response :success
+      assert_changesets_in_order [changeset1, changeset2, changeset3, changeset4]
+
+      get changesets_path(:from => "2015-06-04T16:00:00Z", :to => "2015-06-04T17:30:00Z")
+      assert_response :success
+      assert_changesets_in_order [changeset1, changeset2]
+
+      get changesets_path(:from => "2015-06-04T16:00:00Z", :to => "2015-06-04T17:30:00Z", :order => "oldest")
+      assert_response :success
+      assert_changesets_in_order [changeset2, changeset1]
+    end
+
     ##
     # check that errors are returned if garbage is inserted
     # into query strings
@@ -1614,6 +2328,9 @@ module Api
         get changesets_path(:user => uid)
         assert_response :bad_request, "'#{uid}' isn't a valid user ID"
       end
+
+      get changesets_path(:order => "oldest", :time => "2008-01-01T00:00Z,2018-01-01T00:00Z")
+      assert_response :bad_request, "cannot use order=oldest with time"
     end
 
     ##
@@ -1692,7 +2409,11 @@ module Api
     # check that a changeset can contain a certain max number of changes.
     ## FIXME should be changed to an integration test due to the with_controller
     def test_changeset_limits
-      auth_header = basic_authorization_header create(:user).email, "test"
+      user = create(:user)
+      auth_header = basic_authorization_header user.email, "test"
+
+      # create an old changeset to ensure we have the maximum rate limit
+      create(:changeset, :user => user, :created_at => Time.now.utc - 28.days)
 
       # open a new changeset
       xml = "<osm><changeset/></osm>"
@@ -1715,7 +2436,7 @@ module Api
         assert_response :success, "can't create a new node"
         node_id = @response.body.to_i
 
-        get api_node_path(:id => node_id)
+        get api_node_path(node_id)
         assert_response :success, "can't read back new node"
         node_doc = XML::Parser.string(@response.body).parse
         node_xml = node_doc.find("//osm/node").first
@@ -1726,7 +2447,7 @@ module Api
           node_xml["lon"] = rand.to_s
           node_xml["version"] = (i + 1).to_s
 
-          put api_node_path(:id => node_id), :params => node_doc.to_s, :headers => auth_header
+          put api_node_path(node_id), :params => node_doc.to_s, :headers => auth_header
           assert_response :success, "attempt #{i} should have succeeded"
         end
 
@@ -1735,7 +2456,7 @@ module Api
         node_xml["lon"] = rand.to_s
         node_xml["version"] = offset.to_s
 
-        put api_node_path(:id => node_id), :params => node_doc.to_s, :headers => auth_header
+        put api_node_path(node_id), :params => node_doc.to_s, :headers => auth_header
         assert_response :conflict, "final attempt should have failed"
       end
 
@@ -1743,7 +2464,7 @@ module Api
       assert_equal Changeset::MAX_ELEMENTS + 1, changeset.num_changes
 
       # check that the changeset is now closed as well
-      assert_not(changeset.is_open?,
+      assert_not(changeset.open?,
                  "changeset should have been auto-closed by exceeding " \
                  "element limit.")
     end
@@ -1774,14 +2495,14 @@ module Api
       changeset = create(:changeset, :closed)
 
       assert_difference "changeset.subscribers.count", 1 do
-        post changeset_subscribe_path(changeset), :headers => auth_header
+        post api_changeset_subscribe_path(changeset), :headers => auth_header
       end
       assert_response :success
 
       # not closed changeset
       changeset = create(:changeset)
       assert_difference "changeset.subscribers.count", 1 do
-        post changeset_subscribe_path(changeset), :headers => auth_header
+        post api_changeset_subscribe_path(changeset), :headers => auth_header
       end
       assert_response :success
     end
@@ -1794,7 +2515,7 @@ module Api
       # unauthorized
       changeset = create(:changeset, :closed)
       assert_no_difference "changeset.subscribers.count" do
-        post changeset_subscribe_path(changeset)
+        post api_changeset_subscribe_path(changeset)
       end
       assert_response :unauthorized
 
@@ -1802,7 +2523,7 @@ module Api
 
       # bad changeset id
       assert_no_difference "changeset.subscribers.count" do
-        post changeset_subscribe_path(:id => 999111), :headers => auth_header
+        post api_changeset_subscribe_path(:id => 999111), :headers => auth_header
       end
       assert_response :not_found
 
@@ -1810,7 +2531,7 @@ module Api
       changeset = create(:changeset, :closed)
       changeset.subscribers.push(user)
       assert_no_difference "changeset.subscribers.count" do
-        post changeset_subscribe_path(changeset), :headers => auth_header
+        post api_changeset_subscribe_path(changeset), :headers => auth_header
       end
       assert_response :conflict
     end
@@ -1824,7 +2545,7 @@ module Api
       changeset.subscribers.push(user)
 
       assert_difference "changeset.subscribers.count", -1 do
-        post changeset_unsubscribe_path(changeset), :headers => auth_header
+        post api_changeset_unsubscribe_path(changeset), :headers => auth_header
       end
       assert_response :success
 
@@ -1833,7 +2554,7 @@ module Api
       changeset.subscribers.push(user)
 
       assert_difference "changeset.subscribers.count", -1 do
-        post changeset_unsubscribe_path(changeset), :headers => auth_header
+        post api_changeset_unsubscribe_path(changeset), :headers => auth_header
       end
       assert_response :success
     end
@@ -1844,7 +2565,7 @@ module Api
       # unauthorized
       changeset = create(:changeset, :closed)
       assert_no_difference "changeset.subscribers.count" do
-        post changeset_unsubscribe_path(changeset)
+        post api_changeset_unsubscribe_path(changeset)
       end
       assert_response :unauthorized
 
@@ -1852,14 +2573,14 @@ module Api
 
       # bad changeset id
       assert_no_difference "changeset.subscribers.count" do
-        post changeset_unsubscribe_path(:id => 999111), :headers => auth_header
+        post api_changeset_unsubscribe_path(:id => 999111), :headers => auth_header
       end
       assert_response :not_found
 
       # trying to unsubscribe when not subscribed
       changeset = create(:changeset, :closed)
       assert_no_difference "changeset.subscribers.count" do
-        post changeset_unsubscribe_path(changeset), :headers => auth_header
+        post api_changeset_unsubscribe_path(changeset), :headers => auth_header
       end
       assert_response :not_found
     end
@@ -1867,8 +2588,34 @@ module Api
     private
 
     ##
-    # boilerplate for checking that certain changesets exist in the
-    # output.
+    # check that the output consists of one specific changeset
+    def assert_single_changeset(changeset)
+      assert_select "osm>changeset", 1
+      assert_select "osm>changeset>@id", changeset.id.to_s
+      assert_select "osm>changeset>@created_at", changeset.created_at.xmlschema
+      if changeset.open?
+        assert_select "osm>changeset>@open", "true"
+        assert_select "osm>changeset>@closed_at", 0
+      else
+        assert_select "osm>changeset>@open", "false"
+        assert_select "osm>changeset>@closed_at", changeset.closed_at.xmlschema
+      end
+    end
+
+    def assert_single_changeset_json(changeset, js)
+      assert_equal changeset.id, js["changeset"]["id"]
+      assert_equal changeset.created_at.xmlschema, js["changeset"]["created_at"]
+      if changeset.open?
+        assert js["changeset"]["open"]
+        assert_nil js["changeset"]["closed_at"]
+      else
+        assert_not js["changeset"]["open"]
+        assert_equal changeset.closed_at.xmlschema, js["changeset"]["closed_at"]
+      end
+    end
+
+    ##
+    # check that certain changesets exist in the output
     def assert_changesets(changesets)
       assert_select "osm>changeset", changesets.size
       changesets.each do |changeset|
@@ -1876,6 +2623,15 @@ module Api
       end
     end
 
+    ##
+    # check that certain changesets exist in the output in the specified order
+    def assert_changesets_in_order(changesets)
+      assert_select "osm>changeset", changesets.size
+      changesets.each_with_index do |changeset, index|
+        assert_select "osm>changeset:nth-child(#{index + 1})[id='#{changeset.id}']", 1
+      end
+    end
+
     ##
     # update the changeset_id of a way element
     def update_changeset(xml, changeset_id)