test.js

  reports: computed(function() {
    return get(this, 'getReports').perform();
  }),

  firstReport: computed('reports.value.length', function() {
    return get(this, 'reports.value.firstObject');
  }),
    
  someOtherThing: computed('reports.value.length', function() {
    get(this, 'reports.value').forEach((report) => {
      doCoolStuff(report);
    });
  }),
  ...
  ...
  ...
  
 getReports: task(function*() {
    let reports = yield get(this, 'store').query('report-menu', {
      q: 'classname-EQOrder' + get(this, 'constant').DELIM,
      orderby: 'sequence'
    });
    return reports;
  })