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Silence RSpec specs
RSpec.configure do |config|
config.before(:all, &:silence_output)
config.after(:all, &:enable_output)
end
# Redirects stderr and stdout to /dev/null.
def silence_output
@orig_stderr = $stderr
@orig_stdout = $stdout
# redirect stderr and stdout to /dev/null
$stderr = File.new('/dev/null', 'w')
$stdout = File.new('/dev/null', 'w')
end
# Replace stdout and stderr so anything else is output correctly.
def enable_output
$stderr = @orig_stderr
$stdout = @orig_stdout
@orig_stderr = nil
@orig_stdout = nil
end
@Paxa
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Paxa commented Jan 12, 2015

Also can use Kernel.silence_stream:

silence_stream(STDOUT) do
 ...
end

@AdilKhn
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AdilKhn commented Feb 27, 2015

Great post. I modified silence_output to redirect the output to files instead of the void. Works out great.

def silence_output
  @orig_stderr = $stderr
  @orig_stdout = $stdout

  # redirect stderr and stdout to /dev/null
  $stderr = File.new('./spec/stdout.txt', 'w')
  $stdout = File.new('./spec/stderr.txt', 'w')
end

@marshal003
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marshal003 commented May 19, 2016

Hi guys, above mentioned methods doesn't help me in redirecting stdout for system call (` method). But thanks you all, these examples helped me in identifying the workaround. Here is the workaround I have used.

config.before :each do
    original_system_call_method = GitUtils.method(:`)
    allow(GitUtils).to receive(:`) do |arg|
      Kernel.silence_stream(STDERR) do
        original_system_call_method.call(arg)
      end
    end
  end

# GitUtils is my class where I have multiple utility methods which usage backtick(`) to run shell commands

@wzcolon
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wzcolon commented Jul 13, 2016

Any way to still use a debugger?

@pedrocarmona
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pedrocarmona commented Feb 26, 2021

this also works:

bin/rspec spec/models/user_spec.rb 2>/dev/null

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