confident ruby 3.2 examples

3.2.rb

# tests for 3.2 of confident ruby

# inplicit vs explicit
#
require 'pry'
describe "section 3.2" do

  context "string" do
    class C
      attr_accessor :name
      def initialize(name)
        @name = name
      end
    end

    let(:object) { C.new("ruby") }
    let(:io) { StringIO.new }

    it "explicitly" do
      io.write object
      io.seek(0)
      io.read.should eq "ruby"
    end

    it "implicitly" do
      io.write object
      io.seek(0)
      io.read.should eq "ruby"
    end
  end

  context "struct" do
    require 'OStruct'
    let(:struct) { OpenStruct.new(attributes) }
    let(:attributes) {
      {
        name: "George Washington",
        occupation: "President"
      }
    }
    let(:more_attributes) {
      {
        birth_year: "1732",
        birth_place: "westmoreland, va"
      }
    }

    it "implicitly" do
      result = more_attributes.merge(struct)
      result.keys.size.should eq 4
    end

    it "explicitly" do
      result = more_attributes.merge(struct)
      result.keys.size.should eq 4
    end

  end

  context "Regexp" do
    let(:struct) { OpenStruct.new(name: "Miley Cyrus") }
    let(:body) { "Disney characters such as Miley Cyrus." }

    it do
      body[struct].should eq "Miley Cyrus"
    end

    it do
      body.gsub(struct, "Britney Spears").should eq "Disney characters such as Britney Spears."
    end

    it do
      body.index(struct).should eq 26
    end

    it do
      body.scan(struct).should eq ["Miley Cyrus"]
    end

  end

end