howl.completion
after_each -> completion.unregister 'foo'
.<name> allows direct indexing of completions
c = name: 'foo', factory: -> {}
completion.register c
assert.same completion.foo, c
.unregister(name) unregisters the specified completion
completion.register name: 'foo', factory: -> {}
completion.unregister 'foo'
assert.is_nil completion.foo
.list contains all registered completions
c = name: 'foo', factory: -> {}
completion.register c
assert.includes completion.list, c
.register(options)
raises an error if any of the mandatory fields are missing
assert.raises 'name', -> completion.register nil, -> true
assert.raises 'factory', -> completion.register name: 'foo'
