This is done to decouple our message view related update events
from MessageListData as there are plans to create multiple
MessageListData objects. Instead we update the `stored_messages`
which tracks the complete data for all messages.
This just lets us temporarily assign a value
to a field.
Differences with the "override" scheme:
* override only works on globals
* override (when passed in via run_test) will
just automatically clean up at the end of
the function
This is a pretty straightforward conversion.
The bulk of the diff is just changing emoji.js
to ES6 syntax.
There is one little todo that can be deferred
to the next commit--we are now set up to have
markdown.js require emoji.js directly, since
it is no longer on `window`.
We now show before/after, and we don't complicate
our other test that runs in a big loop.
And we take advantage of function injection to
not have to hack into the "real" emoji_codes
structure.
Note that we're simulating the missing emojis
at a slightly higher level, but we already had test
coverage that emoji.get_emoji_name returns
undefined for unknown codepoints.
The main thing here is that we check that the
actual data got put into our data structures.
(In general we want to move away from stubbing
data modules; any place where we stub data modules
is a relic of earlier days, where we were just
trying to set the bar for 100% line coverage,
even though some of the original coverage was
quite shallow.)
I also use real stubs instead of noops for
the calls out to UI-oriented modules.
In passing I tweak some comments in the actual
dispatch code.
With update_emojis, it is pretty easy
to set up the tests with reasonable
data without reaching into internal
data structures.
Also, we can begin the process of
sharing the same data with our
dispatch tests (upcoming).
We want to undo overrides in reverse order,
which is important if you override the
same name more than once in the same
function.
Until today the code basically prevented
us from ever using the original implementation
of a name we stubbed, and most of them start
as undefined due to their parent modules
starting with `set_global`.
But I do want this proper, and I introduced
a tiny pitfall today.
There was only one place where we weren't
overriding a function, and the use case there
was fairly unique.
Knowing that we're dealing with only functions
will simplify override and allow us to add
features like detecting spurious stubs.
This forces us to more explicitly document at the
top of the file what dependencies we are stubbing,
plus it's less magical.
Also, we may want to do occasional audits of
set_global to clean up places where we mock
things like stream_data, which are probably just
easier to use the real version of now that we
have cleaner APIs to set up stream data.
The modules most affected by this change are our
dispatch-oriented tests--basically, all the
modules that test handling of Zulip events
plus hotkey.js.
Before we were making it impossible to reuse
the function again (so we were preventing
leaks), but it's fine to just restore the
original function, especially now that some
of our tests have grown bigger.
Anders Kaseorg
Steve Howell
Tim Abbott
Ryan Rehman
Dinesh