how to write a test case to the follow component.ts code

the test cases written for the above piece of code should increase the code coverage in sonar

if (this.listOfSortJobs.length == 1) {

  sessionStorage.setItem('selectedSortJob', this.listOfSortJobs[0].name);
  this.processflows = this.listOfSortJobs[0].ProcessFlows;
  sessionStorage.setItem('processflow', JSON.stringify(this.processflows));
  this.route.navigate(['/processflow']);
}

the code coverage is not recognising any tests cases written for these