Gain insights into good testing practices in Ruby on Rails. Learn the testing mindset, convert requirements into user stories, and master feature, request, and unit tests for comprehensive coverage.

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This course aims to teach you how to write better Rails applications by applying good testing practices. You’ll learn about the reasoning behind testing and the process of applying good testing practices. 

In the first half of the course, you’ll learn about the testing mindset and understand its importance. Next, you’ll learn to turn business requirements into user stories. These user stories will become the basis of the code and tests you’ll write.

Once you understand the reasoning and process, you’ll proceed to write the actual tests. You’ll test what is most important to the end user first. So, the first set of tests you’ll learn to write will be feature tests. Finally, you’ll learn to write request tests and unit tests ensuring end-to-end coverage of our application.

Bulletproof Ruby on Rails Applications

# Defining the test
This unit test restricts the `name` field to only contain letters and spaces. To define this one, we’ll set a name containing an emoji character on the user and assert validation failure.

Here’s the test:


context "when the name contains emojis" do
  it "the user is invalid" do
    user = User.new(name: "Hi 🤨")
    user.valid?
    expect(user.errors.messages).to include(:name)
  end
end

Add the test to the widget below and run it.

Let’s learn to write a unit test to implement a format constraint.


Unit Test: Format Validation

Let’s learn to write a unit test to implement a format constraint.

Before We Start

The Why Behind Testing

The How Behind Testing

Planning

The Feature Layer

The Request Layer

The Unit Layer

Conclusion

Unit Test: Format Validation

Defining the test