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# Allows easy mocking of global and class constants
# Inspired by:
# http://missingbit.blogspot.com/2011/07/stubbing-constants-in-rspec_20.html
# http://digitaldumptruck.jotabout.com/?p=551
def mock_constants(constants, &block)
saved_constants = {}
constants.each do |constant, val|
source_object, const_name = parse_constant(constant)
saved_constants[constant] = source_object.const_get(const_name)
with_warnings(nil) {source_object.const_set(const_name, val) }
end
begin
block.call
ensure
constants.each do |constant, val|
source_object, const_name = parse_constant(constant)
with_warnings(nil) { source_object.const_set(const_name, saved_constants[constant]) }
end
end
end
def parse_constant(constant)
source, _, constant_name = constant.to_s.rpartition("::")
[constantize(source), constant_name]
end
# Taken from ActiveSupport
# File activesupport/lib/active_support/core_ext/kernel/reporting.rb, line 3
#
# Sets $VERBOSE for the duration of the block and back to its original value afterwards.
def with_warnings(flag)
old_verbose, $VERBOSE = $VERBOSE, flag
yield
ensure
$VERBOSE = old_verbose
end
# File activesupport/lib/active_support/inflector/methods.rb, line 209
def constantize(camel_cased_word)
names = camel_cased_word.split("::")
names.shift if names.empty? || names.first.empty?
constant = Object
names.each do |name|
constant = constant.const_defined?(name) ? constant.const_get(name) : constant.const_missing(name)
end
constant
end
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