Ruby on Rails

I figured out that I needed to change how I was testing my scope.
Another forum site had this post by a guy named Ian (thanks Ian).

>> Ideally your unit tests should treat models (classes) and instances thereof as
black boxes. After all, it's not really the implementation you care about but the
behavior of the interface.

>> So instead of testing that the scope is implemented in a particular way (i.e.
with a particular set of conditions), try testing that it behaves correctly—that
it returns instances it should and doesn't return instances it shouldn't.
----

This led me to believe I needed to change to testing the behavior not
the stucture. I kept my scope the same but changed my test to the
following. It works, is a good test of the data tested and the results
expected. In the test, I create an array of the instructor's name and
netid and compare that to an array of the name and netid returned by my
scope.

require 'test_helper'
class ClassInstructorTest < ActiveSupport::TestCase
test "named_scope :find_instructor_for_a_course returns name and
netid" do
expected = ['HOLLIS', 'rbh25']
assert_equal expected,
[ClassInstructor.find_instructor_for_a_course('HA5503', 'F10', 'LEC',
1).first.instr_id,
ClassInstructor.find_instructor_for_a_course('HA5503',
'F10', 'LEC', 1).first.netid]
end
end

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