Server side implementation for bulk editing categories

spec/components/topics_bulk_action_spec.rb

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+require 'spec_helper'
+require 'topics_bulk_action'
+
+describe TopicsBulkAction do
+
+  describe "invalid operation" do
+    let(:user) { Fabricate.build(:user) } 
+
+    it "raises an error with an invalid operation" do
+      tba = TopicsBulkAction.new(user, [1], type: 'rm_root')
+      -> { tba.perform! }.should raise_error(Discourse::InvalidParameters)
+    end
+  end
+
+  describe "change_category" do
+    let(:topic) { Fabricate(:topic) }
+    let(:category) { Fabricate(:category) } 
+
+    context "when the user can edit the topic" do
+      it "changes the category and returns the topic_id" do
+        tba = TopicsBulkAction.new(topic.user, [topic.id], type: 'change_category', category_name: category.name)
+        topic_ids = tba.perform!
+        topic_ids.should == [topic.id]
+        topic.reload
+        topic.category.should == category
+      end
+    end
+
+    context "when the user can't edit the topic" do
+      it "doesn't change the category and returns the topic_id" do
+        Guardian.any_instance.expects(:can_edit?).returns(false)
+        tba = TopicsBulkAction.new(topic.user, [topic.id], type: 'change_category', category_name: category.name)
+        topic_ids = tba.perform!
+        topic_ids.should == []
+        topic.reload
+        topic.category.should_not == category
+      end
+    end
+
+  end
+end
+