instance method
assert_no_changes
Ruby on Rails 5.1.7
Since v5.1.7Signature
assert_no_changes(expression, message = nil, &block)Assertion that the result of evaluating an expression is changed before and after invoking the passed in block.
assert_no_changes 'Status.all_good?' do
post :create, params: { status: { ok: true } }
end
An error message can be specified.
assert_no_changes -> { Status.all_good? }, 'Expected the status to be good' do
post :create, params: { status: { ok: false } }
end
Parameters
-
expressionreq -
messageopt = nil -
blockblock
Source
# File activesupport/lib/active_support/testing/assertions.rb, line 182
def assert_no_changes(expression, message = nil, &block)
exp = expression.respond_to?(:call) ? expression : -> { eval(expression.to_s, block.binding) }
before = exp.call
retval = yield
after = exp.call
error = "#{expression.inspect} did change to #{after}"
error = "#{message}.\n#{error}" if message
assert_equal before, after, error
retval
end
Defined in activesupport/lib/active_support/testing/assertions.rb line 182
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Defined in ActiveSupport::Testing::Assertions