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class MockExpectationError < StandardError; end # :nodoc:
module Minitest # :nodoc:
##
# A simple and clean mock object framework.
#
# All mock objects are an instance of Mock
class Mock
alias :__respond_to? :respond_to?
overridden_methods = %w(
===
inspect
object_id
public_send
respond_to_missing?
send
to_s
)
instance_methods.each do |m|
undef_method m unless overridden_methods.include?(m.to_s) || m =~ /^__/
end
overridden_methods.map(&:to_sym).each do |method_id|
define_method method_id do |*args, &b|
if @expected_calls.has_key? method_id then
method_missing(method_id, *args, &b)
else
super(*args, &b)
end
end
end
def initialize # :nodoc:
@expected_calls = Hash.new { |calls, name| calls[name] = [] }
@actual_calls = Hash.new { |calls, name| calls[name] = [] }
end
##
# Expect that method +name+ is called, optionally with +args+ or a
# +blk+, and returns +retval+.
#
# @mock.expect(:meaning_of_life, 42)
# @mock.meaning_of_life # => 42
#
# @mock.expect(:do_something_with, true, [some_obj, true])
# @mock.do_something_with(some_obj, true) # => true
#
# @mock.expect(:do_something_else, true) do |a1, a2|
# a1 == "buggs" && a2 == :bunny
# end
#
# +args+ is compared to the expected args using case equality (ie, the
# '===' operator), allowing for less specific expectations.
#
# @mock.expect(:uses_any_string, true, [String])
# @mock.uses_any_string("foo") # => true
# @mock.verify # => true
#
# @mock.expect(:uses_one_string, true, ["foo"])
# @mock.uses_one_string("bar") # => true
# @mock.verify # => raises MockExpectationError
def expect(name, retval, args=[], &blk)
name = name.to_sym
if block_given?
raise ArgumentError, "args ignored when block given" unless args.empty?
@expected_calls[name] << { :retval => retval, :block => blk }
else
raise ArgumentError, "args must be an array" unless Array === args
@expected_calls[name] << { :retval => retval, :args => args }
end
self
end
def __call name, data # :nodoc:
case data
when Hash then
"#{name}(#{data[:args].inspect[1..-2]}) => #{data[:retval].inspect}"
else
data.map { |d| __call name, d }.join ", "
end
end
##
# Verify that all methods were called as expected. Raises
# +MockExpectationError+ if the mock object was not called as
# expected.
def verify
@expected_calls.each do |name, calls|
calls.each do |expected|
msg1 = "expected #{__call name, expected}"
msg2 = "#{msg1}, got [#{__call name, @actual_calls[name]}]"
raise MockExpectationError, msg2 if
@actual_calls.has_key?(name) and
not @actual_calls[name].include?(expected)
raise MockExpectationError, msg1 unless
@actual_calls.has_key?(name) and
@actual_calls[name].include?(expected)
end
end
true
end
def method_missing(sym, *args) # :nodoc:
unless @expected_calls.has_key?(sym) then
raise NoMethodError, "unmocked method %p, expected one of %p" %
[sym, @expected_calls.keys.sort_by(&:to_s)]
end
index = @actual_calls[sym].length
expected_call = @expected_calls[sym][index]
unless expected_call then
raise MockExpectationError, "No more expects available for %p: %p" %
[sym, args]
end
expected_args, retval, val_block =
expected_call.values_at(:args, :retval, :block)
if val_block then
raise MockExpectationError, "mocked method %p failed block w/ %p" %
[sym, args] unless val_block.call(args)
# keep "verify" happy
@actual_calls[sym] << expected_call
return retval
end
if expected_args.size != args.size then
raise ArgumentError, "mocked method %p expects %d arguments, got %d" %
[sym, expected_args.size, args.size]
end
fully_matched = expected_args.zip(args).all? { |mod, a|
mod === a or mod == a
}
unless fully_matched then
raise MockExpectationError, "mocked method %p called with unexpected arguments %p" %
[sym, args]
end
@actual_calls[sym] << {
:retval => retval,
:args => expected_args.zip(args).map { |mod, a| mod === a ? mod : a }
}
retval
end
def respond_to?(sym, include_private = false) # :nodoc:
return true if @expected_calls.has_key? sym.to_sym
return __respond_to?(sym, include_private)
end
end
end
class Object # :nodoc:
##
# Add a temporary stubbed method replacing +name+ for the duration
# of the +block+. If +val_or_callable+ responds to #call, then it
# returns the result of calling it, otherwise returns the value
# as-is. If stubbed method yields a block, +block_args+ will be
# passed along. Cleans up the stub at the end of the +block+. The
# method +name+ must exist before stubbing.
#
# def test_stale_eh
# obj_under_test = Something.new
# refute obj_under_test.stale?
#
# Time.stub :now, Time.at(0) do
# assert obj_under_test.stale?
# end
# end
#
def stub name, val_or_callable, *block_args, &block
new_name = "__minitest_stub__#{name}"
metaclass = class << self; self; end
if respond_to? name and not methods.map(&:to_s).include? name.to_s then
metaclass.send :define_method, name do |*args|
super(*args)
end
end
metaclass.send :alias_method, new_name, name
metaclass.send :define_method, name do |*args, &blk|
ret = if val_or_callable.respond_to? :call then
val_or_callable.call(*args)
else
val_or_callable
end
blk.call(*block_args) if blk
ret
end
yield self
ensure
metaclass.send :undef_method, name
metaclass.send :alias_method, name, new_name
metaclass.send :undef_method, new_name
end
end
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