add test

spec/exception_notification/slacky_spec.rb

@@ -1,11 +1,77 @@
 require 'spec_helper'
 
 describe ExceptionNotification::Slacky do
-  it 'has a version number' do
-    expect(ExceptionNotification::Slacky::VERSION).not_to be nil
+  before do
+    allow(exception).to receive(:backtrace).and_return(['backtrace line 1', 'backtrace line 2'])
+    allow(exception).to receive(:message).and_return('exception message')
   end
 
-  it 'does something useful' do
-    expect(false).to eq(true)
+  let(:exception) do
+    begin
+      5/0
+    rescue Exception => e
+      e
+    end
+  end
+
+  let(:fake_notification) do
+    [
+      'Exception Occured!',
+      {
+        icon_emoji: ':warning:',
+        attachments: [
+          fallback: "#{exception.class} #{exception.message}",
+          color: 'danger',
+          title: "[ERROR] #{exception.class}",
+          fields: [
+            { title: 'Host',          value: Socket.gethostname,        short: true  },
+            { title: 'Request path',  value: '/foo/bar',                short: true  },
+            { title: 'HTTP Method',   value: 'POST',                    short: true  },
+            { title: 'IP Address',    value: '127.0.0.1',               short: true  },
+            { title: 'Occurred on',   value: exception.backtrace.first, short: false },
+            { title: 'Error message', value: exception.message,         short: false }
+          ]
+        ]
+      }
+    ]
+  end
+
+  describe 'Notification should be sent' do
+    let(:slack_notifier) do
+      ExceptionNotifier::SlackyNotifier.new(options)
+    end
+
+    let(:options) do
+      {
+        webhook_url: 'http://slack.webhook.url',
+        username: 'slacky',
+        channel: '#general',
+        additional_parameters: {
+          icon_emoji: ':warning:'
+        }
+      }
+    end
+
+    let(:rack_options) do
+      { env: { 'PATH_INFO' => '/foo/bar', 'REQUEST_METHOD' => 'POST', 'REMOTE_ADDR' => '127.0.0.1' } }
+    end
+
+    describe 'Notification format' do
+      it {
+        allow_any_instance_of(Slack::Notifier).to receive(:ping).with(*fake_notification)
+        slack_notifier.call(exception, rack_options)
+      }
+    end
+
+    describe 'Options' do
+      before do
+        stub_request(:any, options[:webhook_url])
+        slack_notifier.call(exception, rack_options)
+      end
+
+      it { expect(slack_notifier.notifier.channel).to eq('#general') }
+      it { expect(slack_notifier.notifier.username).to eq('slacky') }
+      it { expect(slack_notifier.notifier.default_payload[:additional_parameters][:icon_emoji]).to eq(':warning:') }
+    end
   end
 end