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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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@@ -0,0 +1,69 @@
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'ert)
+(require 'dash)
+(require 'set)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(ert-deftest set-from-list ()
+  (should (equal '(1 2 3)
+                 (->> '(1 2 3 1 2 3)
+                      set-from-list
+                      set-to-list))))
+
+(ert-deftest set-distinct? ()
+  (should (set-distinct? (set-new 'one 'two 'three)
+                         (set-new 'a 'b 'c)))
+  (should (not
+           (set-distinct? (set-new 1 2 3)
+                          (set-new 3 4 5))))
+  (should (not
+           (set-distinct? (set-new 1 2 3)
+                          (set-new 1 2 3)))))
+
+(ert-deftest set-equal? ()
+  (should (not (set-equal? (set-new 'a 'b 'c)
+                           (set-new 'x 'y 'z))))
+  (should (not (set-equal? (set-new 'a 'b 'c)
+                           (set-new 'a 'b))))
+  (should (set-equal? (set-new 'a 'b 'c)
+                      (set-new 'a 'b 'c))))
+
+(ert-deftest set-intersection ()
+  (should (set-equal? (set-new 2 3)
+                      (set-intersection (set-new 1 2 3)
+                                        (set-new 2 3 4)))))
+
+(ert-deftest set-to/from-list ()
+  (should (equal '(1 2 3)
+                 (->> '(1 1 2 2 3 3)
+                      set-from-list
+                      set-to-list))))
+
+(ert-deftest set-subset? ()
+  (should (not (set-subset? (set-new "black" "grey")
+                            (set-new "red" "green" "blue"))))
+  (should (set-subset? (set-new "red")
+                       (set-new "red" "green" "blue"))))
+
+(ert-deftest set-superset? ()
+  (let ((primary-colors (set-new "red" "green" "blue")))
+    (should (not (set-superset? primary-colors
+                                (set-new "black" "grey"))))
+    (should (set-superset? primary-colors
+                           (set-new "red" "green" "blue")))
+    (should (set-superset? primary-colors
+                           (set-new "red" "blue")))))
+
+(ert-deftest set-empty? ()
+  (should (set-empty? (set-new)))
+  (should (not (set-empty? (set-new 1 2 3)))))
+
+(ert-deftest set-count ()
+  (should (= 0 (set-count (set-new))))
+  (should (= 2 (set-count (set-new 1 1 2 2)))))