@@ -53,6 +53,30 @@ describe('Data Structure : Queue', () => {
5353 expect ( queue . dequeue ( ) ) . toEqual ( 1 ) ;
5454 expect ( queue . dequeue ( ) ) . toEqual ( 4 ) ;
5555 expect ( queue . dequeue ( ) ) . toEqual ( 3 ) ;
56+ expect ( queue . dequeue ( ) ) . toEqual ( null ) ;
57+ } ) ;
58+ 59+ it ( 'Length of linkedlist' , ( ) => {
60+ const queue2 = new Queue ( ) ;
61+ queue2 . enqueue ( 2 ) ;
62+ queue2 . enqueue ( 1 ) ;
63+ queue2 . enqueue ( 4 ) ;
64+ queue2 . enqueue ( 3 ) ;
65+ expect ( queue2 . length ( ) ) . toEqual ( 4 ) ;
66+ } ) ;
67+ 68+ it ( 'Destroy linkedList' , ( ) => {
69+ queue . destroy ( ) ;
70+ expect ( queue . length ( ) ) . toEqual ( 0 ) ;
71+ } ) ;
72+ 73+ it ( 'Override and throw error for other LL methods' , ( ) => {
74+ expect ( ( ) => { queue . addAtBeginning ( ) ; } ) . toThrowError ( 'Not Allowed' ) ;
75+ expect ( ( ) => { queue . addAt ( ) ; } ) . toThrowError ( 'Not Allowed' ) ;
76+ expect ( ( ) => { queue . removeFromEnd ( ) ; } ) . toThrowError ( 'Not Allowed' ) ;
77+ expect ( ( ) => { queue . getLast ( ) ; } ) . toThrowError ( 'Not Allowed' ) ;
78+ expect ( ( ) => { queue . getAt ( ) ; } ) . toThrowError ( 'Not Allowed' ) ;
79+ expect ( ( ) => { queue . removeAt ( ) ; } ) . toThrowError ( 'Not Allowed' ) ;
5680 } ) ;
5781 } ) ;
5882} ) ;
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