+(ert-deftest test-seq-position ()
+ (with-test-sequences (seq '(2 4 6))
+ (should (null (seq-position seq 1)))
+ (should (= (seq-position seq 4) 1)))
+ (let ((seq '(a b c)))
+ (should (null (seq-position seq 'd #'eq)))
+ (should (= (seq-position seq 'a #'eq) 0))
+ (should (null (seq-position seq (make-symbol "a") #'eq)))))
+