Merge branch 'add-metrics-initializer-spec-ee' into 'master'

Add metric initializer spec

See merge request !1109

spec/initializers/metrics_spec.rb

+require 'spec_helper'
+require_relative '../../config/initializers/metrics'
+
+describe 'instrument_classes', lib: true do
+  let(:config) { double(:config) }
+
+  before do
+    allow(config).to receive(:instrument_method)
+    allow(config).to receive(:instrument_methods)
+    allow(config).to receive(:instrument_instance_methods)
+  end
+
+  it 'can autoload and instrument all files' do
+    expect { instrument_classes(config) }.not_to raise_error
+  end
+end