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# File 'lib/better_assert_difference.rb', line 7
def assert_difference(expression, difference = DEFAULT_DIFF, message = nil, &block)
expression_to_diff =
if expression.is_a?(Hash)
expression
else
Array(expression).each_with_object({}) { |exp, expression_hash| expression_hash[exp] = difference }
end
block_to_diff =
expression_to_diff.each_with_object({}) do |(exp, diff), expression_hash|
key =
if exp.respond_to?(:call)
exp
elsif ACTIVE_RECORD_ENABLED && active_record?(exp)
-> { exp.count }
else
-> { eval(exp, block.binding) }
end
expression_hash[key] = diff
end
before = block_to_diff.keys.map(&:call)
retval = yield
after = block_to_diff.keys.map(&:call)
errors = []
before.zip(after, expression_to_diff) do |before_value, after_value, (exp, diff)|
next if before_value + diff == after_value
error = "[#{expression_to_diff.find_index { |expression, _| expression == exp }}] " if expression_to_diff.size > 1
error = "#{error}#{exp.is_a?(Class) ? exp.name : exp.inspect} didn't change by #{diff} {before: #{before_value}, after: #{after_value}}"
error = "#{message}.\n#{error}" if message
errors << error
end
if errors.any?
errors.unshift "#{errors.size} assertion#{errors.length > 1 ? 's' : ''} failed:"
fail errors.join("\n")
end
retval
end
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