Use known, subscribed channels in more tests (prep for #1798) #1988
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In all of these tests, the message list's narrow is a ChannelNarrow, and all of the deleted messages are in that channel. The tests aren't about whether or not the deleted messages are in the message list's narrow; really they're about whether or not the deleted messages are present in the MessageListView model.
Before this, in all the tests touched here, we were exercising the message list with a channel that isn't actually in the PerAccountStore. When we don't pass `stream` to the `prepare` function, the function adds a *different* channel to the store, with a corresponding Subscription, having streamId eg.defaultStreamMessageStreamId. The normal, boring setup, which is suitable for all these tests, is to exercise the message list in a known, subscribed channel. Provide that setup by passing the same `stream` object to `prepare` that we use to create messages and narrows.
…boring The `prepare` helper, and now the prepare-outbox helpers, fall back to this channel ID when a different one isn't specified. That's sensible and lets these tests be a bit more compact. When tests use two different channels, with pairs of variables like `stream` and `otherStream`, or `stream1` and `stream2`, I let that be, even though it might be reasonable for some of them to use eg.defaultStreamMessageStreamId for one of the channels.
This is the boring, common case that makes sense to exercise here.
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The main work here is to change several tests of
MessageListViewandMessageStoreso that the channels they exercise are actually known (i.e. present in the store) and subscribed, which we can consider the boring, common case. Without this change, some of these tests would fail when we change the behavior for unsubscribed channels, for #1798.Compare d6f2441 and f89ce2e, where we similarly changed the setup for various widget tests, also to prepare for #1798.
Related: #1798