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#!/usr/bin/env ruby
#---
# Copyright 2003, 2004 by Jim Weirich (jim@weriichhouse.org).
# All rights reserved.
# Permission is granted for use, copying, modification, distribution,
# and distribution of modified versions of this work as long as the
# above copyright notice is included.
#+++
require 'test/unit'
# FlexMock is a flexible mock object suitable for using with Ruby's
# Test::Unit unit test framework. FlexMock has a simple interface
# that's easy to remember, and leaves the hard stuff to all those
# other mock object implementations.
#
# Usage: See TestSamples for example usage.
class FlexMock
include Test::Unit::Assertions
# Create a FlexMock object.
def initialize
@handlers = Hash.new
@counts = Hash.new(0)
@expected_counts = Hash.new
end
# Handle all messages denoted by +sym+ by calling the given block
# and passing any parameters to the block. If we know exactly how
# many calls are to be made to a particular method, we may check
# that by passing in the number of expected calls as a second
# paramter.
def mock_handle(sym, expected_count=nil, &block)
if block_given?
@handlers[sym] = block
else
@handlers[sym] = proc { }
end
@expected_counts[sym] = expected_count if expected_count
end
# Verify that each method that had an explicit expected count was
# actually called that many times.
def mock_verify
@expected_counts.keys.each do |key|
assert_equal @expected_counts[key], @counts[key],
"Expected method #{key} to be called #{@expected_counts[key]} times, " +
"got #{@counts[key]}"
end
end
# Report how many times a method was called.
def mock_count(sym)
@counts[sym]
end
# Ignore all undefined (missing) method calls.
def mock_ignore_missing
@ignore_missing = true
end
# Handle missing methods by attempting to look up a handler.
def method_missing(sym, *args, &block)
if handler = @handlers[sym]
@counts[sym] += 1
args << block if block_given?
handler.call(*args)
else
super(sym, *args, &block) unless @ignore_missing
end
end
# Class method to make sure that verify is called at the end of a
# test.
def self.use
mock = new
yield mock
ensure
mock.mock_verify
end
end
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