describe('initialization', function() {
  it('sets grades to default array of grades', function() {
    expect($scope.grades).to.equal(["first", "second", "third"]);
  });

  it('sets selectedGrade to null', function() {
    expect($scope.selectedGrade).to.be.null;
  });

  it('sets selectedStudents to empty array', function() {
    expect($scope.selectedStudents).to.equal([]);
  });

  it('sets allStudents to the index of students returned from the server', function() {
    expect($scope.allStudents).to.equal([{name: "alex", grade: "third"},
                                         {name: "tom", grade: "second"},
                                         {name: "silvio", grade: "first"}
                                        ]);
  });
});