Since 4/13/2016, the dart dev compiler is warning about imports where some names are not used, although the whole import is still being used.

E.g.

import {X, Y} from './test';

// only use X but not Y

Will result in the error:

[INFO] type: HINT The name Y is shown, but not used

We should clean up our production sources, but probably ignore this warning for our tests.
For now we ignore this warning everywhere to not get blocked.