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diff --git a/users/wpcarro/emacs/pkgs/list/tests.el b/users/wpcarro/emacs/pkgs/list/tests.el
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@@ -0,0 +1,107 @@
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'ert)
+(require 'list)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(setq xs '(1 2 3 4 5))
+
+(ert-deftest list-length ()
+  (should (= 0 (list-length '())))
+  (should (= 5 (list-length xs))))
+
+(ert-deftest list-reduce ()
+  (should (= 16 (list-reduce 1 (lambda (x acc) (+ x acc)) xs))))
+
+(ert-deftest list-map ()
+  (should
+   (equal '(2 4 6 8 10)
+          (list-map (lambda (x) (* x 2)) xs))))
+
+(ert-deftest list-xs-distinct-by? ()
+  (should
+   (equal t (list-xs-distinct-by?
+             (lambda (x) (plist-get x :kbd))
+             '((:kbd "C-a" :name "foo")
+               (:kbd "C-b" :name "foo"))))))
+
+(ert-deftest list-dedupe-adjacent ()
+  (should (equal '(1 2 3 4 3 5)
+                 (list-dedupe-adjacent '(1 1 1 2 2 3 4 4 3 5 5)))))
+
+(ert-deftest list-contains? ()
+  ;; Assert returns t or nil
+  (should (equal t (list-contains? 1 xs)))
+  (should (equal nil (list-contains? 100 xs))))
+
+(ert-deftest list-join ()
+  (should (equal "foo-bar-baz"
+                 (list-join "-" '("foo" "bar" "baz")))))
+
+(ert-deftest list-chunk ()
+  (should (equal '((1 2 3 4 5 6))
+                 (list-chunk 7 '(1 2 3 4 5 6))))
+  (should (equal '((1) (2) (3) (4) (5) (6))
+                 (list-chunk 1 '(1 2 3 4 5 6))))
+  (should (equal '((1 2 3) (4 5 6))
+                 (list-chunk 3 '(1 2 3 4 5 6))))
+  (should (equal '((1 2) (3 4) (5 6))
+                 (list-chunk 2 '(1 2 3 4 5 6)))))
+
+(ert-deftest list-find ()
+  (should (equal 2 (list-find (lambda (x) (= 2 x)) '(1 2 3 4)))))
+
+(ert-deftest list-all? ()
+  (should (equal t (list-all? (lambda (x) (= 2 x)) nil)))
+  (should (null (list-all? (lambda (x) (= 2 x)) '(1 2 3))))
+  (should (equal t (list-all? (lambda (x) (= 2 x)) '(2 2 2 2)))))
+
+(ert-deftest list-any? ()
+  (should (null (list-any? (lambda (x) (= 2 x)) nil)))
+  (should (equal t (list-any? (lambda (x) (= 2 x)) '(1 2 3))))
+  (should (null (list-any? (lambda (x) (= 4 x)) '(1 2 3)))))
+
+(ert-deftest list-duplicate ()
+  (should (equal '() (list-duplicate 0 "hello")))
+  (should (equal '("hi") (list-duplicate 1 "hi")))
+  (should (equal '("bye" "bye") (list-duplicate 2 "bye")))
+  (should (equal '((1 2) (1 2) (1 2)) (list-duplicate 3 '(1 2)))))
+
+(ert-deftest list-first ()
+  (should (null (list-first '())))
+  (should (equal 1 (list-first '() 1)))
+  (should (equal 1 (list-first '(1))))
+  (should (equal 1 (list-first '(1) 2)))
+  (should (equal 1 (list-first '(1 2 3)))))
+
+(ert-deftest list-last ()
+  (should (null (list-last '())))
+  (should (equal 1 (list-last '() 1)))
+  (should (equal 1 (list-last '(1))))
+  (should (equal 1 (list-last '(1) 2)))
+  (should (equal 3 (list-last '(1 2 3)))))
+
+(ert-deftest list-wrap ()
+  (should (equal '("hello") (list-wrap "hello")))
+  (should (equal '(1 2 3) (list-wrap '(1 2 3))))
+  (should (equal '() (list-wrap nil))))
+
+(ert-deftest list-delete ()
+  (should (equal '(b c) (list-delete 'a '(a b c))))
+  (should (equal '(a b c) (list-delete 'd '(a b c))))
+  (should (equal '(a b c) (list-delete 'b '(a b b c))))
+  (should (equal '() (list-delete 'b '()))))
+
+(ert-deftest list-concat ()
+  (should (equal '(1 2 3 4 5) (list-concat '(1) '(2 3) '(4 5))))
+  (should (equal '(1 2 3) (list-concat '() '(1 2 3)))))
+
+;; TODO(wpcarro): Supoprt this.
+;; (ert-deftest list-zip ()
+;;   (should (equal '((1 3 5) (2 4 6)) (list-zip '(1 2) '(3 4) '(5 6))))
+;;   (should (equal '((1 3 5)) (list-zip '(1 2) '(3) '(5 6)))))