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

Nice matcher.
You should probably avoid rescuing all exceptions though, it's generally bad practice.

You could do

match do |actual|
    # Use the URI library to parse the string, returning false if this fails.
    URI.parse(actual)
  rescue URI::InvalidURIError
    false
  end

I'm using ruby 2.5.5 and it's returning a URI::Generic instead of raising an exception, so I implemented it like the following:

RSpec::Matchers.define :be_url do |expected|
  match do |actual|
    actual =~ URI::regexp
  end
end

Am I the only one that prefers be_a_url instead of be_url?

Maybe it's because there is already be_a( Hash ), etc.

Thoughts?

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.