At it’s simplest, the question is as follows:
If I want test a method that calls another method with two values, and I want
to check the value of the second argument but don’t know the value of the first
argument, how can I do that? In essence,
we have m1 -> calls m2(a, b), I want to test the value of b but I don’t know
the value of a. If I knew both values, I could just use
“expect(object).to_receive(:m2).with(a, b)” But what do I use if I don’t know
what “a” should be (I know what class it should be, but #with is not using ===
to compare values, so that doesn’t help.
——— More detail that explains why I don’t know the value of “a" ———
I’m writing specs for some helpers. For one controller, I have a set of helpers
like follows:
form_editing_for_type(type, &block) ultimately generates a
“form_for … fields_for …” with the block inside the #fields_for
nav_buttons(f, options) generates
Preview, Next, Cancel buttons for the FormBuilder object “f”; “options” has
certain overrides for defaults; it must be called from the block
passed to
form_editing_for_type
prev_buttom(f, options) these three
helpers are called by nav_buttons only
next_button(f, options)
cancel_button(f, options)
nav_button(f, name, default_label, disabled, options)
this helper is called by the above three helpers only
So far, I’m testing each helper separately (including the ones only called by
other helpers. The problem I’m encountering is that I want to test that the
“options” passed into “nav_buttons” is being passed on to “prev_button”, etc. I
could do that with something like the following:
it ‘passes “options” through” do
@options = ...
expect(self).to
receive(:prev_button).with(ActionView::Helpers::FormBuilder,
@options).and_call_original
form_editing_for_type(@type) { |f|
nav_buttons(f, @options)
}
end
But, there are a few issues here.
1) Is “self” the correct object to expect #prev_button to be called against?
2) I don’t know the exact value of the first argument to :prev_button, so how
do I tell expect that I don’t really know the value (I do know @options and I
that’s what I’m checking)? ActionView::Helpers::FormBuilder does not work
(apparently #with is not using “===“ to check the value).
And then, the bigger issue: does it maybe make more sense, since the last four
helpers are essentially private, to just test #nav_buttons for all the things
that I would have tested the other four helpers for? This might better fit the
idea of testing the desired result, not how the result is obtained.
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