removed leading space in csv column header names

app/views/audio_events/download.csv.erb

@@ -1,5 +1,5 @@
 <%# <%== does not do html entity escaping %>
-<%== @formatted_annotations.columns.join(', ') %>
+<%== @formatted_annotations.columns.join(',') %>
 <%==
      CSV.generate do |csv|
        @formatted_annotations.each do |row|

spec/requests/audio_events_spec.rb

@@ -0,0 +1,37 @@
+require 'rails_helper'
+require 'rspec/mocks'
+
+describe "Audio Events" do
+
+  create_entire_hierarchy
+
+  # projects update/create actions expect payload from html form as well as json
+  describe 'Downloading Csv' do
+
+    before(:each) do
+      @env ||= {}
+      @env['HTTP_AUTHORIZATION'] = admin_token
+
+      @download_url = "/audio_recordings/#{audio_recording.id}/audio_events/download"
+    end
+
+    it 'downloads csv file with no leading spaces in headers' do
+
+      get @download_url, nil, @env
+      expect(response).to have_http_status(200)
+      column_headers = "audio_event_id,audio_recording_id,audio_recording_uuid,audio_recording_start_date_utc_00_00,"+
+          "audio_recording_start_time_utc_00_00,audio_recording_start_datetime_utc_00_00,event_created_at_date_utc_00_00,"+
+          "event_created_at_time_utc_00_00,event_created_at_datetime_utc_00_00,projects,site_id,site_name,"+
+          "event_start_date_utc_00_00,event_start_time_utc_00_00,event_start_datetime_utc_00_00,event_start_seconds,"+
+          "event_end_seconds,event_duration_seconds,low_frequency_hertz,high_frequency_hertz,is_reference,created_by,"+
+          "updated_by,common_name_tags,common_name_tag_ids,species_name_tags,species_name_tag_ids,other_tags,"+
+          "other_tag_ids,listen_url,library_url\n"
+      expect(response.body).to start_with(column_headers)
+    end
+
+  end
+
+end
+
+
+