57   const rootCtl = new MockController('root');  constant
58   runControllerTree(rootCtl);
64   const rootCtl = new MockController('root');  constant
66     if (rootCtl.state === 'idle') {
67       rootCtl.setState('state1');
68     } else if (rootCtl.state === 'state1') {
69       rootCtl.setState('state2');
72   runControllerTree(rootCtl);
78   const rootCtl = new MockController('root');  constant
82     rootCtl.setState(nextState);
83     if (rootCtl.state === 'idle') return;
85     if (rootCtl.state === 'state1') {
90     if (rootCtl.state === 'state2') {
96     if (rootCtl.state === 'state3') {
104   runControllerTree(rootCtl);
113   runControllerTree(rootCtl);
125   runControllerTree(rootCtl);
138   runControllerTree(rootCtl);
152   runControllerTree(rootCtl);