anchor.diff:        vector2 = new TypedVector.from([1.0, 2.0, 3.0, 4.0, 5.0]);
       });
   
  +    tearDown(() {
  +      vector1 = null;
  +      vector2 = null;
  +    });
  +
       test('Vector addition: ', () {
         TypedVector result = vector1 + vector2;
   
  
positive.code:       expect(vector1.length, equals(6));
  
        vector2 = new TypedVector.from(new List.filled(11, 1.0));
        expect(vector2.length, 11);
        expect(vector2[10], 1.0);
      });
  
      test('Vector elements updating: ', () {
        vector1[0] = 34.0;
        vector1[4] = 277.0;
        vector1[5] = 1000.0;
  
negative.code:     });
  
      test('Vector length updating: ', () {
        vector1 = new TypedVector.from([1.0, 2.0, 3.0, 4.0, 5.0, 6.0]);
  
        vector1.length = 8;
        expect(vector1.length, 8);
  
  