mini_test.md

# rspec spec/model/post_test.rb
require 'minitest/autorun'
require_relative '../../app/models/post'

# mock
@blog=MiniTest::Mock.new

# Avdi sometimes mock like this
@blog = Object.new

setup gem

run just one test file

ruby -Itest spec/**/*_spec.rb

Rakefile

vim ./Rakefile

require "bundler/gem_tasks"
require 'rake/testtask'

Rake::TestTask.new(:test) do |t|
  t.libs << 'lib'
  t.libs << 'test'
  t.pattern = 'test/**/*_test.rb'
  t.verbose = false
end

task default: :test

test folder

mkdir ./test

rspec like matchers

Assertion	Examples
must_be	list.size.must_be :==, 0
must_be_close_to	subject.size.must_be_close_to 1,1
must_be_empty	list.must_be_empty
must_be_instance_of	list.must_be_instance_of Array
must_be_kind_of	list.must_be_kind_of Enumerable
must_be_nil	list.first.must_be_nil
must_be_same_as	subject.must_be_same_as subject
must_be_silent	proc { "no stdout or stderr" }.must_be_silent
must_be_within_epsilon	subject.size.must_be_within_epsilon 1,1
must_equal	subject.size.must_equal 2
must_include	subject.must_include "skinny jeans"
must_match	subject.first.must_match /silly/
must_output	proc { print "#{subject.size}!" }.must_output "2!"
must_respond_to	subject.must_respond_to :count
must_raise	proc { subject.foo }.must_raise NoMethodError
must_send	subject.must_send [subject, :values_at, 0]
must_throw	proc { throw :done if subject.any? }.must_throw :done

stolen from: http://mattsears.com/articles/2011/12/10/minitest-quick-reference

Testing for exceptions with MiniTest

proc {code block that will actually raise that exception}.must_raise(expectedException)
proc {Integer.fizzbuzz}.must_raise(NoMethodError)

source http://cczona.com/blog/2011/10/asserting-exceptions-with-minitest/

Rails minitest

https://guides.rubyonrails.org/testing.html

assert_chages

https://api.rubyonrails.org/v6.0.1/classes/ActiveSupport/Testing/Assertions.html#method-i-assert_changes

assert_changes -> { Status.all_good? }, 'Expected the status to be bad' do
  post :create, params: { status: { incident: true } }
end

assert_select

https://github.com/rails/rails-dom-testing/blob/master/lib/rails/dom/testing/assertions/selector_assertions.rb

assert_select "h1", "Welcome#index"


assert_select "ol" do |elements|
  elements.each do |element|
    assert_select element, "li", 4
  end
end