class Object

Public Instance Methods

silence_warnings() { || ... } click to toggle source 
# File lib/minitest/stub_const.rb, line 60
def silence_warnings
  orig = $VERBOSE
  $VERBOSE = nil
  yield
ensure
  $VERBOSE = orig
end
stub_const(name, val) { || ... } click to toggle source

Replace the value of constant name for the duration of a block. This is especially useful when testing that the expected class methods are being called on a Module or Class instance.

Example:

module Foo
  BAR = :original
end

Foo.stub_const(:BAR, :stubbed) do
  Foo::BAR
end
# => :stubbed

Foo::BAR
# => :original

# File lib/minitest/stub_const.rb, line 19
def stub_const(name, val, &block)
  defined = const_defined?(name)
  orig = const_get(name) if defined
  silence_warnings { const_set(name, val) }
  yield
ensure
  if defined
    silence_warnings { const_set(name, orig) }
  else
    remove_const(name)
  end
end
stub_remove_const(name) { || ... } click to toggle source

Remove the constant name for the duration of a block. This is useful when testing code that checks whether a constant is defined or not. Simply yields to the passed block if the constant is not currently defined.

Example:

Object.stub_remove_const(:File) do
  "Look ma, no File!" unless defined?(File)
end
# => "Look ma, no File!"

# File lib/minitest/stub_const.rb, line 43
def stub_remove_const(name)
  if const_defined?(name)
    begin
      orig = const_get(name)
      remove_const(name)
      yield
    ensure
      const_set(name, orig)
    end
  else
    yield
  end
end