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class Object
# 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
def stub_const(name, val = nil, &block)
stub_consts(name => val, &block)
end
# Same as stub_const except it supports a Hash of +name+ to +value+ pairs
# of the constants that will be stubbed for the duration of the +block+.
#
# Example:
#
# module Foo
# BAR = :original1
# BAZ = :original2
# end
#
# Foo.stub_consts(BAR: :stubble, BAZ: :stubby) do
# [Foo::BAR, Foo::BAZ]
# end
# # => [:stubble, :stubby]
#
# [Foo::BAR, Foo::BAZ]
# # => [:original1, :original2]
def stub_consts(consts, &block)
original_values = {}
consts.each_pair do |name, val|
if const_defined?(name)
original_value = const_get(name)
original_values[name] = original_value
end
silence_warnings { const_set(name, val) }
end
yield
ensure
consts.keys.each do |name|
if original_values.key?(name)
silence_warnings { const_set(name, original_values[name]) }
else
remove_const(name)
end
end
end
# 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!"
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
# Add a minimal implementation of ActiveSupport's silence_warnings if it
# hasn't already been defined, to call a block with warnings disabled.
unless respond_to?(:silence_warnings)
def silence_warnings
orig = $VERBOSE
$VERBOSE = nil
yield
ensure
$VERBOSE = orig
end
end
end
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