factories/workbenches: Add a new `:with_referential` trait

This new trait allows us to create a referential association along with
the workbench.

Works like this:

    create(:workbench, :with_referential)

We do this to allow us to reuse the `organisation`, `line_referential`,
and `stop_area_referential` associations to ensure that the values of
those fields are consistent in both the resulting workbench and
referential objects.

If we need to create multiple referentials, we could add an `amount`
later.

Left in some commented code describing my earlier attempts at this.
Fortunately, found this Stack Overflow post that pointed me in the right
direction:
https://stackoverflow.com/questions/20685322/how-to-create-an-association-in-factorygirl-with-a-value-lazy-evaluated-from-ano

I need this for a new `spec/helpers/table_builder_helper_spec.rb` spec,
wherein I'm trying to test building a table of workspaces, but having
trouble with code I copied from the app that tries to get
`#validity_period` from workbenches. Thought at first that adding a
referential (which does have this field) could help get past that, but
it didn't quite work. Needs more investigation.

Refs #3479

0 files changed, 0 insertions, 0 deletions