Try Ruby Minitest


Output about Rails default testing frame.

Test code template

The template of the test code using Minitest is as follows.


require 'minitest/autorun'

class SampleTest < Minitest::Test
  def test_sample
    assert_equal 5, 'Hello'.length

-Call the library required for Minitest on the first line. -Make the SampleTest class inherit the Minitest :: Test class. -Define the test method to be executed in the SampleTest class (test_sample) It can be created in the flow.

assert_equal is a validation method, the first argument is the expected value and the second argument is the validation value. Therefore, test_sample method, "'Hello' number of characters in the string" is testing whether a "five characters". The test passes because the results are equal. test.png -Runs: Number of executed test methods (1 because only test_sample) -Assertions: Number of validation methods executed (assert_equal is used once) -Failures: Number of test methods that failed validation -Errors: Number of test methods that gave an error during verification -Skips: Number of test methods whose execution was skipped by the skip method Represents.

Validation method example Let's use some validation methods by referring to the API documentation of Minitest.


require 'minitest/autorun'

def hello(name)
  puts "#{name}San, Hello!"

class HelloTest < Minitest::Test
  def test_hello
    assert_output("Bob's, Hello!\n") { hello("Bob") }

You can use assert_output to test the standard output.


require 'minitest/autorun'

def multiple_of_eleven?(number)
  number % 11 == 0

class MultipleOfElevenTest < Minitest::Test
  def test_true
    assert multiple_of_eleven? 121
  def test_false
    refute multiple_of_eleven? 13

You can test the authenticity by using the assert and refute methods.


Minitest makes it easy to implement tests, so let's take advantage of them. Next time, I want to output Rspec as well.


An introduction to Ruby for those who want to become professionals Junichi Ito [Author]

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