title: Minitest Error - ArgumentError: wrong number of arguments (given 1, expected 0)
body: <p>I am doing an exercise on exercism.io. This is requested in the Spec document:</p>
  
  <ol>
  <li>The <code>Hello World!</code> program will greet me, the caller.</li>
  <li>If I tell the program my name is Alice, it will greet me by saying "Hello, Alice!".</li>
  <li>If I neglect to give it my name, it will greet me by saying "Hello, World!"</li>
  </ol>
  
  <hr>
  
  <pre><code>class HelloWorldTest &lt; Minitest::Test
    def test_no_name
      assert_equal 'Hello, World!', HelloWorld.hello
    end
  
    def test_sample_name
      assert_equal 'Hello, Alice!', HelloWorld.hello('Alice')
    end
  
    def test_other_sample_name
      assert_equal 'Hello, Bob!', HelloWorld.hello('Bob')
    end
  end
  </code></pre>
  
  <p>This is my program:</p>
  
  <pre><code>class HelloWorld
    def self.hello
      "Hello, World!"
    end
  
    def initialize(name)
      @name = name
    end
  
    def say_hello
      puts "Hello, #{@name}!"
    end
  end
  
  print "Give me your name: "
  your_name = gets.chomp
  hello = HelloWorld.new(your_name)
  if your_name == ""
    puts "Hello, World!"
  else
    hello.say_hello
  end
  </code></pre>
  
  <p>The program runs and satisfies all of the requirements, but I get the error:</p>
  
  <pre><code>1) Error:
  HelloWorldTest#test_sample_name:
  ArgumentError: wrong number of arguments (given 1, expected 0)
      /Users/drempel/exercism/ruby/hello-world/hello_world.rb:3:in `hello'
      hello_world_test.rb:24:in `test_sample_name'
  
  3 runs, 1 assertions, 0 failures, 1 errors, 1 skips
  </code></pre>
  
  <p>How do I define a method that doesn't require arguments?</p>