RSpec url matcher.

url_matcher.rb

# Drop this into /spec/support/matchers
# Usage: result.should be_url
# Passes if result is a valid url, returns error "expected result to be url" if not.

# Matcher to see if a string is a URL or not.
RSpec::Matchers.define :be_url do |expected|
	# The match method, returns true if valie, false if not.
	match do |actual|
		# Use the URI library to parse the string, returning false if this fails.
		URI.parse(actual) rescue false
	end
end

Also, ESLint was whining about the unused block variable, expected and URI:regexp being obsolet. It preferred the following:

RSpec::Matchers.define :be_a_url do
  match do |actual|
    actual =~ URI::DEFAULT_PARSER.make_regexp
  end
end

Thanks for the matcher.

It would be nice if implemented in rspec project directly.