This is a gem vcr demo app. The app shows current weather of Ho Chi Minh city when you access the root path.

Setup guide

1. You need an API key of WeatherAPI.com. Please create an account and subscribe to this API: https://rapidapi.com/weatherapi/api/weatherapi-com/. Don't worry, it has free plan 😁.

2. Copy API key and set it to ENV["RAPID_API_KEY"]. For this app, we only use the Realtime Weather API from WeatherAPI.com

3. Start rails server

4. Access root path.

Demo guide

If you read the code from the HomeController, you will know that every single time you load the root page, the app call API to get the weather data. In testing, I use vcr gem to record the API request & response to a cassete file. You will code a real HTTP request for the first request for the recording purpose. After then you can disconnect your internet connection and your test still run smoothly since vcr replaying the record file.

1. First, run the test to make sure everything works fine: bundle exec rspec
2. Then try to disable/disconnect your internet connection and run the test again. It should still pass because vcr would replaying the record file.
3. Go to this file: spec/requests/home_spec.rb and:

• Change value of skip option to true for context "when using gem vcr"
• Change value of skip option to false for context "when not using gem vcr"

4. Run the test again. This time the test should fail and raise error like the picture below. This error will occur when you try to have a real HTTP to outside without "notifying" vcr. You need to put the code that occur HTTP request in the VCR.use_cassette block.