describe "String indexing" do

  before :each do
    @string = "foo"
  end

  it "should return first character's ASCII value for position 0" do
    @string[0].should == ?f
  end
  
  it "should return las character's ASCII value for position -1" do
    @string[-1].should == ?o
  end
  
  it "should return the first two characters for substring 0..1" do
    @string[0..1].should == "fo"
  end
  
  it "should return the last two characters for substring -2..-1" do
    @string[-2..-1].should == "oo"
  end
  
  it "should replace the second character with a new substring" do
    @string[1] = "id"
    @string.should == "fido"
  end
  
  it "should become empty when 0..-1 is set to empty string" do
    @string[0..-1] = ""
    @string.should be_empty # calls string.empty?
  end
    
end
describe "String case manipulation" do

  before :each do
    @string = "fOo"
  end
  
  it "should be converted to all caps when upcase is sent" do
    @string.upcase.should == "FOO"
  end
  
  it "should start with a capital letter followed by lowercase when capitalized" do
    @string.capitalize.should == "Foo"
  end
  
  it "should be converted to all lowercase when downcase is sent" do
    @string.downcase.should == "foo"
  end
end