module ActiveSupport::Testing::ErrorReporterAssertions

def assert_error_reported(error_class = StandardError, &block)

assert_predicate report, :handled?
assert_equal :warning, report.severity
assert_equal "admin", report.context[:section]
assert_equal "Oops", report.error.message
end
# ...
report = assert_error_reported(IOError) do

value.
To test further details about the reported exception, you can use the return

end
Rails.error.report(IOError.new("Oops"))
assert_error_reported(IOError) do

Passes if the evaluated code in the yielded block reports a matching exception.

to +Rails.error+.
Assertion that the block should cause at least one exception to be reported 
def assert_error_reported(error_class = StandardError, &block)
  reports = ErrorCollector.record do
    _assert_nothing_raised_or_warn("assert_error_reported", &block)
  end
  if reports.empty?
    assert(false, "Expected a #{error_class.name} to be reported, but there were no errors reported.")
  elsif (report = reports.find { |r| error_class === r.error })
    self.assertions += 1
    report
  else
    message = "Expected a #{error_class.name} to be reported, but none of the " \
      "#{reports.size} reported errors matched:  \n" \
      "#{reports.map { |r| r.error.class.name }.join("\n  ")}"
    assert(false, message)
  end
end

def assert_no_error_reported(&block)

end
perform_service(param: 'no_exception')
assert_no_error_reported do

Passes if evaluated code in the yielded block reports no exception.

to +Rails.error+.
Assertion that the block should not cause an exception to be reported 
def assert_no_error_reported(&block)
  reports = ErrorCollector.record do
    _assert_nothing_raised_or_warn("assert_no_error_reported", &block)
  end
  assert_predicate(reports, :empty?)
end