Ok/No Checks

[trans]

Currently we have something like this:

TestCase HelloWorld do

  Setup do
    HelloWorld.new
  end

  Unit :hello => "aspect" do |hello_world|
    ...
  end

end

This creates a "setup" and the return value of the setup procedure is passed to the unit test.

One of the features of KO that would be nice to see in Lemon is ok/no checks. These are calls that rerun a test passing
new arguments to it. In KO it look like this:

Test.case HelloWorld do

  test "aspect" do |arg|
     ...
  end

  ok "arg"
  no "arg"

end

We could move Lemon in that direction by simply adding ok/no methods, like so:

TestCase HelloWorld do

  Unit :hello => "aspect" do |arg|
    ...
  end

  Ok "arg"
  No "arg"

end

But then how does setup's return value come into play? Do we simple combine the arguments?

TestCase HelloWorld do

  Setup do
    HelloWorld.new
  end

  Unit :hello => "aspect" do |hello_world, arg|
    ...
  end

  Ok "arg"
  No "arg"

end

First off, it may be very tricky to implment this combination, as currently it depends on arity == 0 or not as to whether setup's return value is passed, which would no longer work.

On second thought, the use of Ok/No style tests will often preclude the use of setup return value b/c the arguments are likely to define a new instance of the target class. Perhaps then setup should take the arg and pass any needed args on the the test method.

TestCase HelloWorld do

  Setup do |arg1, arg2|
    [ HelloWorld.new(arg1), arg2 ]
  end

  Unit :hello => "aspect" do  |hello_world, arg2|
    ...
  end

  Ok "arg1", "arg2"
  No "arg1", "arg2"

end

If there is no setup method, then the args are passed directly to the unit test.

It seems a bit strange but it is clearly the corrent arrangement.

[trans]

On the other hand, we might simply use instance variables like regular folk.

TestCase HelloWorld do

  Setup do |arg1, arg2|
    @hello_world = HelloWorld.new(arg1)
  end

  Unit :hello => "aspect" do  |arg1, arg2|
    @hello_world ...
  end

  Ok "arg1", "arg2"
  No "arg1", "arg2"

end