message: Set velocity's mock option in the unit test
diff: @@ -31,6 +31,8 @@ import Matrix from 'matrix-js-sdk';
  const test_utils = require('test-utils');
  const mockclock = require('mock-clock');
  +import Velocity from 'velocity-animate';
  +
  let client;
  const room = new Matrix.Room();
  @@ -65,9 +67,17 @@ describe('MessagePanel', function() {
  // HACK: We assume all settings want to be disabled
  SettingsStore.getValue = sinon.stub().returns(false);
  +
  + // This option clobbers the duratrion of all animations to be 1ms
  + // which makes unit testing a lot simpler (the animation doesn't
  + // complete without this even if we mock the clock and tick it
  + // what should be the correct amount of time).
  + Velocity.mock = true;
  });
  afterEach(function() {
  + delete Velocity.mock;
  +
  clock.uninstall();
  sandbox.restore();
  });
  