new lambda syntax + must_raise

assertion_style_spec.rb

it "must raise an exception if the file does not exist" do
  Helper::tmp do |tmp|
    assert_raises(Errno::ENOENT) do
      Doubleshot::Compiler::Classpath.new.add(tmp + "asdf")
    end
  end
end

lambda_syntax_must_raise_spec.rb

it "must raise an exception if the file does not exist" do
  Helper::tmp do |tmp|
    lambda do
      Doubleshot::Compiler::Classpath.new.add(tmp + "asdf")
    end.must_raise(Errno::ENOENT)
  end
end

new_lambda_syntax_must_raise_spec.rb

it "must raise an exception if the file does not exist" do
  Helper::tmp do |tmp|
    -> do
      Doubleshot::Compiler::Classpath.new.add(tmp + "asdf")
    end.must_raise(Errno::ENOENT)
  end
end

I've been using assertion style because lambda style just seemed awkward to me. But the new lambda syntax is growing on me in this example.

I didn't dislike the new syntax before, I just don't do much assigning lambdas to variables so I haven't had much opportunity to use it. But in this case, it looks nice I think even if it's the same amount of "words" as the old style. I dunno, just some food for thought since the #must_raise matcher in Minitest was one of my few gripes with it.