Test-driven development workflow in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a test method in Ruby using Minitest.

Ruby

def [1]_test
  assert_equal(4, 2 + 2)
end

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

Atest_addition

Bverify

Ccheck_sum

Dsimple

Attempts:

3 left

💡 Hint

Common Mistakes

Not starting the method name with 'test_' causes the test not to run.

Using vague method names that don't describe the test.

The test method name should start with test_ followed by a descriptive name. Here, test_addition clearly describes the test.

2fill in blank

medium

Complete the code to write a failing test first in TDD.

Ruby

def test_[1]
  assert_equal(5, add(2, 2))
end

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

Asum

Badd_numbers

Cwrong_sum

Daddition

Attempts:

3 left

💡 Hint

Common Mistakes

Writing a passing test before implementing the code.

Using correct expected values that make the test pass immediately.

The test is supposed to fail first in TDD. Since add(2, 2) should be 4, expecting 5 makes the test fail.

3fill in blank

hard

Fix the error in the test assertion to correctly check the output of the add method.

Ruby

def test_addition
  assert_equal([1], add(2, 3))
end

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

A4

B6

Cnil

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong expected values causing test failures.

Confusing actual and expected values in assertions.

The sum of 2 and 3 is 5, so the expected value in assert_equal should be 5.

4fill in blank

hard

Fill both blanks to complete the TDD cycle: write a failing test, then implement the method.

Ruby

def test_[1]
  assert_equal(9, [2](4, 5))
end

def [2](a, b)
  a + b
end

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Asum

Badd

Cmultiply

Dsubtract

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatch between test method name and method under test.

Calling a method that is not defined.

The test method and the method under test must have matching names. Here, test_add tests the add method.

5fill in blank

hard

Fill all three blanks to complete a TDD example: write a test, implement the method, and run the test.

Ruby

def test_[1]
  assert_equal([2], [3](3, 7))
end

def [3](x, y)
  x + y
end

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

Asum

B10

Cadd

Dmultiply

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong expected values.

Mismatch between test method and method name.

Forgetting to define the method.

The test method test_sum checks the add method, expecting 10 as the sum of 3 and 7.