On testing arguments in RUBYOPT, command line arguments aren't quoted so
that it will fail if ruby command (which is passed as the first
arugment) is placed under a directory which contains spaces.

Use `spawn(program, *args)` instead of `spawn(command, options={})` to
fix it.

Signed-off-by: Takuro Ashie <ashie@clear-code.com>

Signed-off-by: Takuro Ashie <ashie@clear-code.com>

Signed-off-by: Takuro Ashie <ashie@clear-code.com>

It shows a wrong message "matched correctly" on failed case and doesn't
show actual log. In addition it shows only one unmached pattern even if
multiple patterns match unexpectedly. It makes hard to debug.

Signed-off-by: Takuro Ashie <ashie@clear-code.com>

On Windows "-rC:/path/to/bundler/setup" is already set to RUBYOPT so that
following error is occurred when original RUBYOPT is discarded:

C:/tools/ruby25/lib/ruby/2.5.0/rubygems.rb:289:in `find_spec_for_exe':
can't find gem bundler (>= 0.a) with executable bundle (Gem::GemNotFoundException)
	from C:/tools/ruby25/lib/ruby/2.5.0/rubygems.rb:308:in `activate_bin_path'
	from C:/tools/ruby25/bin/bundle:23:in `<main>'

Signed-off-by: Takuro Ashie <ashie@clear-code.com>

Signed-off-by: Takuro Ashie <ashie@clear-code.com>