Software Engineering

Red-Green-Refactor: Mastering TDD with Ruby & RSpec

Focus on the core TDD workflow: "Red-Green-Refactor." Develop skills by writing failing tests (Red), crafting code to pass them (Green), and refactoring while keeping tests passing (Refactor). This course emphasizes practice over new theory, allowing you to hone your TDD abilities with various coding challenges.

RSpec

Ruby

See path

5 lessons

27 practices

3 hours

Course details

Practicing Test Driven Development with Ruby and RSpec

Preview

Applying a Percentage-Based Discount

Zero Discount Handling Task

Calculating Accurate Decimal Discounts

Negative Price Error Handling in Discount Calculation

Discount Function Error Handling and Calculation Task

Negative Discount Handling

Previous Course Next Course: Isolating Dependencies with Test Doubles in Ruby & RSpec

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I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

Software Engineer

+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

From our community

Hear what our customers have to say about CodeSignal Learn

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

Software Engineer

+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

Red-Green-Refactor: Mastering TDD with Ruby & RSpec

Course details

Unit 16 practices44 min

Unit 25 practices38 min

Unit 35 practices38 min

Unit 45 practices38 min

Unit 56 practices44 min

Turn screen time into skills time

Join the 1M+ learners on CodeSignal

From our community

From our community