Test doubles concept in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a test double named 'user'.

Ruby

user = [1]("user")

Drag options to blanks, or click blank then click option'

Amock

Bdouble

Cstub

Dfake

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'mock' instead of 'double' which is not a direct method in RSpec.

Confusing 'stub' which is used to replace methods, not create doubles.

In Ruby testing, double creates a test double object.

2fill in blank

medium

Complete the code to make the test double respond to 'name' with 'Alice'.

Ruby

allow(user).to receive(:[1]).and_return("Alice")

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Aage

Bid

Cname

Demail

Attempts:

3 left

💡 Hint

Common Mistakes

Using an unrelated method name that the double does not respond to.

Confusing the symbol name with a string.

The receive method specifies which message the double should respond to. Here, it is :name.

3fill in blank

hard

Fix the error in the code to verify the double received the 'save' message.

Ruby

expect(user).to have_received(:[1])

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Acreate

Bdelete

Cupdate

Dsave

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method name that was never called on the double.

Confusing the matcher syntax.

The have_received matcher checks if the double received the :save message.

4fill in blank

hard

Fill both blanks to create a double that responds to 'title' with 'Book' and 'author' with 'John'.

Ruby

book = double("book", [1]: "Book", [2]: "John")

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Atitle

Bname

Cauthor

Dpublisher

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated attribute names.

Mixing up keys and values.

The double is created with attributes title and author set to given values.

5fill in blank

hard

Fill all three blanks to create a double 'car' with 'make' as 'Toyota', 'model' as 'Corolla', and verify it received 'start'.

Ruby

car = double("car", [1]: "Toyota", [2]: "Corolla")
allow(car).to receive(:start)
car.start
expect(car).to have_received(:[3])

Drag options to blanks, or click blank then click option'

Amake

Bmodel

Cstart

Dstop

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong attribute names.

Checking for a method that was not called.

The double has make and model attributes, and we verify it received the start message.