Press 'u' in watch mode to update snapshots

[lukescott]

Ava borrows Jest's snapshot feature, and from #1275 and other issues, this feature is evolving in Ava. That's really awesome.

Jest, in addition, has an interactive watcher that:

• Runs only tests related to files that have changed
• Replaces previous console output of passing tests
• Provides commands to interact with the running watcher

One of the commands is u, which updates snapshots of tests that just ran.

I became familiar with Ava thru @novemberborn when working on babel-plugin-import-glob. I really like Ava, especially with the TAP-like syntax.

Ava just needs an interactive watcher to compliment the snapshot feature.

[sindresorhus]

We already do the first thing, but I agree, the rest would be very useful too.

[novemberborn]

Let's focus this issue on the u command:

One of the commands is u, which updates snapshots of tests that just ran.

[masaeedu]

@novemberborn Is there already an issue for a proper interactive UI? I had no idea there was a u option since it didn't seem to be documented, and the console UI provides no indication that this shortcut is available.

[novemberborn]

@masaeedu yes, see #1525.