+;; CONS
+(test (equal (cons 1 2) '(1 . 2)))
+(test (equal (cons 1 nil) '(1)))
+(test (equal (cons nil 2) '(NIL . 2)))
+(test (equal (cons nil nil) '(NIL)))
+(test (equal (cons 1 (cons 2 (cons 3 (cons 4 nil)))) '(1 2 3 4)))
+(test (equal (cons 'a 'b) '(A . B)))
+(test (equal (cons 'a (cons 'b (cons 'c '()))) '(A B C)))
+(test (equal (cons 'a '(b c d)) '(A B C D)))
+
+;; CONSP
+(test (not (consp 'nil)))
+(test (not (consp nil)))
+(test (not (consp ())))
+(test (not (consp '())))
+(test (consp (cons 1 2)))
+
+;; ATOM
+(test (atom 'sss))
+(test (not (atom (cons 1 2))))
+(test (atom nil))
+(test (atom '()))
+(test (atom 3))
+
+;; RPLACA
+(let ((some-list (list* 'one 'two 'three 'four)))
+ (test (equal (rplaca some-list 'uno) '(UNO TWO THREE . FOUR)))
+ (test (equal some-list '(UNO TWO THREE . FOUR))))
+
+;; RPLACD
+(let ((some-list (list* 'one 'two 'three 'four)))
+ (test (equal (rplacd (last some-list) (list 'IV)) '(THREE IV)))
+ (test (equal some-list '(ONE TWO THREE IV))))
+
+;; CAR, CDR and variants
+(test (equal (car nil) nil))
+(test (equal (cdr '(1 . 2)) 2))
+(test (equal (cdr '(1 2)) '(2)))
+(test (equal (cadr '(1 2)) 2))
+(test (equal (car '(a b c)) 'a))
+(test (equal (cdr '(a b c)) '(b c)))
+(test (equal (caar '((1 2) 3)) 1))
+(test (equal (cadr '(1 2 3)) 2))
+(test (equal (cdar '((1 2) 3)) '(2)))
+(test (equal (cddr '(1 2 3)) '(3)))
+(test (equal (caaar '(((1)))) 1))
+(test (equal (caadr '(1 (2))) 2))
+(test (equal (cadar '((1 2))) 2))
+(test (equal (caddr '(1 2 3)) 3))
+(test (equal (cdaar '(((1 2)))) '(2)))
+(test (equal (cdadr '(1 (2 3))) '(3)))
+(test (equal (cddar '((1 2 3))) '(3)))
+(test (equal (cdddr '(1 2 3 4)) '(4)))
+(test (equal (caaaar '((((1))))) 1))
+(test (equal (caaadr '(1 ((2)))) 2))
+(test (equal (caadar '((1 (2)))) 2))
+(test (equal (caaddr '(1 2 (3))) 3))
+(test (equal (cadaar '(((1 2)))) 2))
+(test (equal (cadadr '(1 (2 3))) 3))
+(test (equal (caddar '((1 2 3))) 3))
+(test (equal (cadddr '(1 2 3 4)) 4))
+(test (equal (cdaaar '((((1 2))))) '(2)))
+(test (equal (cdaadr '(1 ((2 3)))) '(3)))
+(test (equal (cdadar '((1 (2 3)))) '(3)))
+(test (equal (cdaddr '(1 2 (3 4))) '(4)))
+(test (equal (cddaar '(((1 2 3)))) '(3)))
+(test (equal (cddadr '(1 (2 3 4))) '(4)))
+(test (equal (cdddar '((1 2 3 4))) '(4)))
+(test (equal (cddddr '(1 2 3 4 5)) '(5)))
+
+; COPY-TREE
+(test (let* ((foo (list '(1 2) '(3 4)))