ruby.vowels.rb

# Download this file:
# https://gist.github.com/aviflombaum/872638777f7511d2a30a/download

# Run it from your terminal with: 
# ruby ruby.basics.rb
# (Just make sure you are in the right directory)

# ======================================
# Ignore All This Code
# ======================================

@tests = 0

def test(title, &b)
  @tests += 1
  begin
    if b
      result = b.call
      if result.is_a?(Array)
        puts "#{@tests}. fail: #{title}"
        puts "      expected #{result.first} to equal #{result.last}"
      elsif result
        puts "#{@tests}. pass: #{title}"
      else
        puts "#{@tests}. fail: #{title}"
      end
    else
      puts "#{@tests}. pending: #{title}"
    end
  rescue => e
    puts "fail: #{title}"
    puts e
  end
end

def assert(statement)
  !!statement
end

def assert_equal(actual, expected)
  if expected == actual
    true
  else
    [expected, actual]
  end
end

class Object
  def __
    puts "__ should be replaced with a value or expression to make the test pass."
    false
  end
end

# ======================================
# Start Here - Make these tests pass.
# ======================================

# Define a method named is_a_vowel? that takes one
# argument and returns true or false depending on
# whether the argument is a vowel.

# Method definition goes here:

def is_a_vowel?(letter)
  case letter
  when "a", "e", "i", "o", "u"
    true
  else
    false
  end
end



# you can use == to compare a string to another string
# and check for equality.
# 1. 
test 'that "a" is a vowel' do 
  is_a_vowel?("a")
  assert is_a_vowel?("a")  
end

# 2. 
test 'that "e" is a vowel' do 
  is_a_vowel?("e")
  assert is_a_vowel?("e")  
end

# 3. 
test 'that "i" is a vowel' do 
  is_a_vowel?("i")
  assert is_a_vowel?("i")  
end


# 4. 
test 'that "o" is a vowel' do 
  is_a_vowel?("o")
  assert is_a_vowel?("o")  
end

# 5. 
test 'that "u" is a vowel' do 
  is_a_vowel?("u")
  assert is_a_vowel?("u")  
end


# 6. 
test 'that "b" is not a vowel' do 
  is_a_vowel?("b")
  assert !is_a_vowel?("b")  
end

# 7. 
test 'that "c" is not a vowel' do 
  is_a_vowel?("c")
  assert !is_a_vowel?("c")  
end