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ruby 第4回 assert_equal

hoge

Last updated at 2020-11-18Posted at 2020-11-18

お題: assert_equal

期待値と即値がequalかどうかを確かめる関数 assert_equal を自作する．

解法: red, green

とりあえず例を参考に,

def assert_equal(expected, result)
  return expected == result
end

p assert_equal(1, 1)
p assert_equal(1, 2)

とすると, p assert_equal(1, 1) は true, p assert_equal(1, 2) は false が返ってきた.

解説: colorize -出色の継承-

colorize を使うと色が変わるらしい.

require 'colorize'

def assert_equal(expected, result)
  if expected == result
    puts 'true'.green
  else
    puts 'false'.red
  end
end

assert_equal(1, 1)
assert_equal(1, 2)

とすると, p assert_equal(1, 1) は true (緑), p assert_equal(1, 2) は false (赤) が出力された.

改良: richer output

出力を少し細かく. print の中身を変更.


require 'colorize'

def assert_equal(expected, result)
    if expected == result
	print "succeeded in assert_equal.\n".green
    else
	print "failed in assert_equal.\n".red
    end
end

assert_equal(1, 1)
assert_equal(1, 2)

拡張: assert_not_equal

今度は assert_not_equal を自作. 比較を!=に変えるだけ.


require 'colorize'

def assert_not_equal(expected, result)
    if expected != result
	print "succeeded in assert_not_equal.\n".green
    else
	print "failed in assert_not_equal.\n".red
    end
end

assert_not_equal(1, 1)
assert_not_equal(1, 2)

補足: 重複実行の予防

code が書いてあるファイル名 (FILE) が，動いているファイル名 ($PROGRAM_NAME) と一致したら中身を実行する書き方があるらしい.


require './assert_equal'
require './assert_not_equal'

if $PROGRAM_NAME == __FILE__
    assert_equal(1, 1)
    assert_equal(1, 2)
    assert_not_equal(1, 2)
    assert_not_equal(1, 1)
end

参考サイト

チャート式ruby-IV(assert_equal)

source ~/Lecture/Fall2020/M-ScaleSimu/grad_members_20f/members/hiroki0733/c4_assert_equal.org

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