6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
# File 'lib/better_assert_difference.rb', line 6
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] = DEFAULT_DIFF }
end
block_to_diff =
expression_to_diff.each_with_object({}) do |(exp, diff), expression_hash|
key =
if exp.respond_to?(:call)
exp
elsif exp.respond_to?(:count) && !exp.is_a?(String)
-> { exp.count }
else
-> { eval(exp, block.binding) }
end
expression_hash[key] = diff
end
before = block_to_diff.keys.map(&:call)
retval = yield
block_to_diff.each_with_index do |(exp, diff), i|
error = "#{exp.inspect} didn't change by #{diff}"
error = "#{message}.\n#{error}" if message
assert_equal(before[i] + diff, exp.call, error)
end
retval
end
|