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diff --git a/users/wpcarro/emacs/pkgs/set/tests.el b/users/wpcarro/emacs/pkgs/set/tests.el
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+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'ert)
+(require 'dash)
+(require 'set)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(ert-deftest set-from-list ()
+  (equal '(1 2 3)
+         (->> '(1 2 3 1 2 3)
+              set-from-list
+              set-to-list)))
+
+(ert-deftest set-distinct? ()
+  (and
+   (set-distinct? (set-new 'one 'two 'three)
+                  (set-new 'a 'b 'c))
+   (not
+    (set-distinct? (set-new 1 2 3)
+                   (set-new 3 4 5)))
+   (not
+    (set-distinct? (set-new 1 2 3)
+                   (set-new 1 2 3)))))
+
+(ert-deftest set-equal? ()
+  (and
+   (set-equal? (set-new 'a 'b 'c)
+               (set-new 'x 'y 'z))
+   (set-equal? (set-new 'a 'b 'c)
+               (set-new 'a 'b))
+   (set-equal? (set-new 'a 'b 'c)
+               (set-new 'a 'b 'c))))
+
+(ert-deftest set-intersection ()
+  (set-equal? (set-new 2 3)
+              (set-intersection (set-new 1 2 3)
+                                (set-new 2 3 4))))
+
+(ert-deftest set-to/from-list ()
+  (equal '(1 2 3)
+         (->> '(1 1 2 2 3 3)
+              set-from-list
+              set-to-list)))
+
+(ert-deftest set-subset? ()
+  (let ((primary-colors (set-new "red" "green" "blue")))
+    ;; set-subset?
+    (and
+     (set-subset? (set-new "black" "grey")
+                  primary-colors)
+     (set-subset? (set-new "red")
+                  primary-colors))))
+
+(ert-deftest set-subset/superset? ()
+  (let ((primary-colors (set-new "red" "green" "blue")))
+    ;; set-subset?
+    (and
+     (not (set-superset? primary-colors
+                         (set-new "black" "grey")))
+     (set-superset? primary-colors
+                    (set-new "red" "green" "blue"))
+     (set-superset? primary-colors
+                    (set-new "red" "blue")))))
+
+(ert-deftest set-empty? ()
+  (and
+   (set-empty? (set-new))
+   (set-empty? (set-new 1 2 3))))
+
+(ert-deftest set-count ()
+  (and
+   (= 0 (set-count (set-new)))
+   (= 2 (set-count (set-new 1 1 2 2)))))