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rails--rails/railties/test/console_helpers.rb
yuuji.yaginuma 1b86d90136 Enable Performance/UnfreezeString cop
In Ruby 2.3 or later, `String#+@` is available and `+@` is faster than `dup`.

```ruby
# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  gem "benchmark-ips"
end

Benchmark.ips do |x|
  x.report('+@') { +"" }
  x.report('dup') { "".dup }
  x.compare!
end
```

```
$ ruby -v benchmark.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
Warming up --------------------------------------
                  +@   282.289k i/100ms
                 dup   187.638k i/100ms
Calculating -------------------------------------
                  +@      6.775M (± 3.6%) i/s -     33.875M in   5.006253s
                 dup      3.320M (± 2.2%) i/s -     16.700M in   5.032125s

Comparison:
                  +@:  6775299.3 i/s
                 dup:  3320400.7 i/s - 2.04x  slower

```
2018-09-23 08:56:55 +09:00

25 lines
514 B
Ruby

# frozen_string_literal: true
begin
require "pty"
rescue LoadError
end
module ConsoleHelpers
def assert_output(expected, io, timeout = 10)
timeout = Time.now + timeout
output = +""
until output.include?(expected) || Time.now > timeout
if IO.select([io], [], [], 0.1)
output << io.read(1)
end
end
assert_includes output, expected, "#{expected.inspect} expected, but got:\n\n#{output}"
end
def available_pty?
defined?(PTY) && PTY.respond_to?(:open)
end
end