Add mocha adpater

lib/mocha_adapter.rb

@@ -0,0 +1,16 @@
+class MochaAdapter < TestingFrameworkAdapter
+  SUCCESS_REGEXP = /(\d+) passing/
+  FAILURES_REGEXP = /(\d+) failing/
+
+  def self.framework_name
+    'Mocha'
+  end
+
+  def parse_output(output)
+    matches_success = SUCCESS_REGEXP.match(output[:stderr])
+    matches_failed = FAILURES_REGEXP.match(output[:stderr])
+    failed = matches_failed ? matches_failed.captures.try(:first).to_i : 0
+    success = matches_success ? matches_success.captures.try(:first).to_i : 0
+    {count: success+failed, failed: failed}
+  end
+end

spec/lib/mocha_adapter_spec.rb

@@ -0,0 +1,14 @@
+require 'rails_helper'
+
+describe MochaAdapter do
+  let(:adapter) { described_class.new }
+  let(:count) { 42 }
+  let(:failed) { 25 }
+  let(:stderr) { "#{count-failed} passing (20ms)\n\n#{failed} failing" }
+
+  describe '#parse_output' do
+    it 'returns the correct numbers' do
+      expect(adapter.parse_output(stderr: stderr)).to eq(count: count, failed: failed)
+    end
+  end
+end