Count wiki page creation

This adds a counter to count page creation, which is reflected in the
usage-data we collect.

The number created is stored in Redis, avoiding DB access.

1 files changed, 27 insertions, 0 deletions

diff --git a/spec/services/wiki_pages/base_service_spec.rb b/spec/services/wiki_pages/base_service_spec.rb
new file mode 100644
index 00000000000..2e70246c6f2
--- /dev/null
+++ b/spec/services/wiki_pages/base_service_spec.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe WikiPages::BaseService do
+  let(:project) { double('project') }
+  let(:user) { double('user') }
+
+  subject(:service) { described_class.new(project, user, {}) }
+
+  describe '#increment_usage' do
+    counter = Gitlab::UsageDataCounters::WikiPageCounter
+    error = counter::UnknownEvent
+
+    it 'raises an error on unknown events' do
+      expect { subject.send(:increment_usage, :bad_event) }.to raise_error error
+    end
+
+    context 'the event is valid' do
+      counter::KNOWN_EVENTS.each do |e|
+        it "updates the #{e} counter" do
+          expect { subject.send(:increment_usage, e) }.to change { counter.read(e) }
+        end
+      end
+    end
+  end
+end