toteka_tri.rb

# -*- coding: utf-8 -*-
require 'test/unit'

class TriApp
  def on_OK(t1, t2, t3)
    n1 = positive_integer(t1)
    n2 = positive_integer(t2)
    n3 = positive_integer(t3)
    return "三角形ではありません" unless triangle?(n1, n2, n3)
    case [n1, n2, n3].uniq.size
    when 1
      "正三角形"
    when 2
      "二等辺三角形"
    else
      "三角形"
    end
  rescue ArgumentError, TypeError
    "引数がエラーです"
  end

  def positive_integer(text)
    n = Integer(text)
    raise ArgumentError if n <=0
    n
  end

  def triangle?(n1, n2, n3)
    n1 < n2 + n3 &&
      n2 < n1 + n3 &&
      n3 < n1 + n2
  end
end

class TestTriangle < Test::Unit::TestCase
  def test_tri
    app = TriApp.new
    assert_equal("引数がエラーです", app.on_OK("", "", ''))
    assert_equal("引数がエラーです", app.on_OK(nil, nil, ''))
    assert_equal("引数がエラーです", app.on_OK("a", "b", '1'))
    assert_equal("引数がエラーです", app.on_OK("1 a", "2", '1'))
    assert_equal("引数がエラーです", app.on_OK("1  1", "2", '1'))
    assert_equal("引数がエラーです", app.on_OK("0", "1", '1'))
    assert_equal("引数がエラーです", app.on_OK("-1", "1", '1'))
    assert_equal("引数がエラーです", app.on_OK("1.0", "1.2", '1.1'))
    assert_equal("三角形ではありません", app.on_OK("  1", " 2", '1 '))
    assert_equal("引数がエラーです", app.on_OK("  １", " 2", '1 '))
    assert_equal("三角形", app.on_OK("2", "3", "4"))
    assert_equal("三角形", app.on_OK("200000000000000000000000000000000",
                                     "300000000000000000000000000000000",
                                     "400000000000000000000000000000000"))
    assert_equal("三角形ではありません", app.on_OK("12", "3", "4"))
    assert_equal("三角形ではありません", app.on_OK("7", "3", "4"))
    assert_equal("二等辺三角形", app.on_OK("2", "3", "2"))
    assert_equal("二等辺三角形", app.on_OK("2", "2", "3"))
    assert_equal("正三角形", app.on_OK("2", "2", "2"))
  end
end