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describe "#bar" do
  let(:foo){FactoryGirl.build_stubbed(:foo)}
  let(:bar_id){double("bar_id")}
  let(:bar){double("bar")}
  subject{foo.bar}
  before do
    foo.stub(:bar_id){bar_id}
    Foo.stub(:find).with(bar_id){bar}
  end

jjb

class Foo
  def bar
    Bar.find(bar_id)
  end
end

jjb

# First do this
Time.zone = 'EST'

# Now you can do this
Time.zone.now

# and this!
Time.zone.local(2013, 1, 1)

# rails/activerecord/arel work with it:

jjb

def my_method(arg1, arg2)
  Foo.typecheck arg1
  Bar.typecheck arg2

  puts "The method finished!"
end

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class Object
  def self.typecheck(object)
    unless self == object.class
      raise ArgumentError,
        "expected type: #{self}. given: #{object.class}."
    end
  end
end

class Foo; end

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def my_method(arg1, arg2)
  unless Foo == arg1.class
    raise ArgumentError,
      "A Foo is expected for the first argument. An #{arg1.class} was given."
  end
  unless Bar == arg2.class
    raise ArgumentError,
      "A Bar is expected for the first argument. An #{arg2.class} was given."
  end

jjb

function chpwd {
  if [ -r $PWD/Gemfile ]; then
    export PATH=./bin:${PATH//\.\/bin:}
  else
    regexp-replace PATH '\./bin:' ''
  fi
}

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# diff -c 1.txt 2.txt
*** 1.txt	2012-11-03 23:24:05.000000000 -0400
--- 2.txt	2012-11-03 23:24:13.000000000 -0400
***************
*** 1,2 ****
  foo
! bar
\ No newline at end of file
--- 1,3 ----
  foo

jjb

# diff -c 1.txt 3.txt - lack of newline is announced in output
*** 1.txt	2012-11-03 23:24:05.000000000 -0400
--- 3.txt	2012-11-03 23:28:44.000000000 -0400
***************
*** 1,2 ****
! foo
  bar
\ No newline at end of file
--- 1,2 ----
! food

jjb

foo
bar