Delegating testing to another class

ruby-talk
1

This is probably funky.. :slight_smile:

I'm writing some tests with Test::Unit::TestCase, and I want them to be
data-driven. I want to abstract the assertions to another class (call
it TestIt) more tightly tied to the data.

So far, I either get NoMethodError exceptions because TestIt isn't
subclassed from Test::Unit::TestCase nor mixes in any of those modules,
or else (if I *do* subclass or mixin) the assertions test properly but
don't get counted in the total tally displayed because they're not being
performed by the main Test::Unit::TestCase subclass.

It seems as though I might be able to address the first somehow with
bindings and closure, but I don't know how.

In the meantime, I'm trying another approach, but this is an interesting
scenario I'd like to explore more.

Here's a stripped-down sample:

Each TestIt object includes the data to be tested.

class TestMyStuff < Test::Unit::TestCase
  def test1()
    TestVals.each do |t1| # TestVals is an array of TestIt objects
      t1.test do |t2|
        true
      end
    end
  end
end

class TestIt
  def test(&block)
    assert("Descriptive message") do
      block.call
    end
  end
end

···

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2

Found a solution:

Ken Coar wrote:

class TestMyStuff < Test::Unit::TestCase
  def test1()
    TestVals.each do |t1| # TestVals is an array of TestIt objects

        t1.tCase = self

      t1.test do |t2|
        true
      end
    end
  end
end

class TestIt
  def test(&block)

      @tCase.assert("Descriptive message") do

      block.call
    end
  end
end

Not exactly elegant, but by passing the caller I can access its assert*
methods explicitly rather than implicitly.

···

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