target.should ==(expected value)
target.should eql(expected value)
target.should equal(expected value)
target.should !=(expected value)

target.should be_true    # Passes if target == true
target.should be_false   # Passes if target == false
target.should be_nil     # Passes if target.nil?
target.should exist      # Passes if target.exist?

target.should be_a(expected)  #Passes if target.kind_of?(expected)

# Array Matchers
target.should have(number).named_collection__or__sugar
target.should have_at_least(number).items
target.should have_at_most(number).items
target.should have_exactly(number).items
target.should include(expected)