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module AssertHelper
# Same as "assert_changes" in Rails but for countable entities.
# @return [*] return value of the block
# @example
# assert_changes_by("Notification.count", exactly: 2) do
# cause_two_notifications_to_get_delivered
# end
def assert_changes_by(expression, message = nil, exactly: nil, at_least: nil, at_most: nil, &block)
# rubocop:disable Security/Eval
exp = expression.respond_to?(:call) ? expression : -> { eval(expression.to_s, block.binding) }
# rubocop:enable Security/Eval
raise "either exactly:, at_least: or at_most: must be specified" unless exactly || at_least || at_most
raise "exactly: is mutually exclusive with other options" if exactly && (at_least || at_most)
raise "at_most: must be larger than at_least:" if at_least && at_most && at_most < at_least
before = exp.call
retval = assert_nothing_raised(&block)
after = exp.call
delta = after - before
if exactly
at_most = exactly
at_least = exactly
end
# We do not make these an if/else since we allow both at_most and at_least
if at_most
error = "#{expression.inspect} changed by #{delta} which is more than #{at_most}"
error = "#{error}. It was #{before} and became #{after}"
error = "#{message.call}.\n" if message&.respond_to?(:call)
error = "#{message}.\n#{error}" if message && !message.respond_to?(:call)
assert delta <= at_most, error
end
if at_least
error = "#{expression.inspect} changed by #{delta} which is less than #{at_least}"
error = "#{error}. It was #{before} and became #{after}"
error = "#{message.call}.\n" if message&.respond_to?(:call)
error = "#{message}.\n#{error}" if message && !message.respond_to?(:call)
assert delta >= at_least, error
end
retval
end
def assert_same_set(exp, act, msg = nil)
assert_equal(exp.to_set, act.to_set, msg)
end
end
Version data entries
10 entries across 10 versions & 1 rubygems