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Versions: 30
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Contents
module StdStreamsHelper
def std_stream
Tempfile.new SecureRandom.uuid
end
# Capture STDOUT in a variable
#
# Given tempfiles are rewinded and unlinked after yield, so no cleanup
# required. You can read from the stream using `stdout.read`.
#
# Usage
#
# out_stream = Tempfile.new
# capture_stdout(out_stream) { do_something }
def capture_stdout(stdout)
original_stdout = $stdout.dup
$stdout.reopen stdout
yield
ensure
$stdout.reopen original_stdout
stdout.rewind
stdout.unlink
end
# Capture STDOUT and STDERR in variables
#
# Given tempfiles are rewinded and unlinked after yield, so no cleanup
# required. You can read from the stream using `stdout.read`.
#
# Usage
#
# out_stream = Tempfile.new
# err_stream = Tempfile.new
# capture_std_streams(out_stream, err_stream) { do_something }
def capture_std_streams(stdout, stderr)
original_stdout = $stdout.dup
$stdout.reopen stdout
original_stderr = $stderr.dup
$stderr.reopen stderr
yield
ensure
$stdout.reopen original_stdout
$stderr.reopen original_stderr
stdout.rewind
stdout.unlink
stderr.rewind
stderr.unlink
end
# Silence the STDOUT.
#
# Ignore the STDOUT and don't print it in the test suite's STDOUT.
#
# If an error is found the output the output is raised as an error, failing
# the spec. Warnings and other AppSignal messages are ignored.
#
# Usage
#
# silence { do_something }
#
# silence { puts "ERROR!" }
# # => Error found in silenced output:
# # ERROR!
def silence(&block)
stream = Tempfile.new(SecureRandom.uuid)
capture_std_streams(stream, stream, &block)
ensure
output = stream.read
raise "Error found in silenced output:\n#{output}" if output =~ /(ERR|Error|error)/
end
end
Version data entries
30 entries across 30 versions & 1 rubygems