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diff --git a/users/wpcarro/emacs/pkgs/bag/tests.el b/users/wpcarro/emacs/pkgs/bag/tests.el
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+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'ert)
+(require 'bag)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(setq fixture (bag-from-list '(1 1 1 2 2 3)))
+
+(ert-deftest bag-add ()
+  (should (not (bag-contains? 4 fixture)))
+  (should (bag-contains? 4 (bag-add 4 fixture))))
+
+(ert-deftest bag-remove ()
+  (should (bag-contains? 1 fixture))
+  (should (not (bag-contains? 3 (bag-remove 3 fixture)))))
+
+(ert-deftest bag-count ()
+  (should (= 3 (bag-count 1 fixture)))
+  (should (= 2 (bag-count 2 fixture)))
+  (should (= 1 (bag-count 3 fixture))))
+
+(ert-deftest bag-total ()
+  (should (= 6 (bag-total fixture))))
+
+(ert-deftest bag-contains? ()
+  (should (bag-contains? 1 fixture))
+  (should (not (bag-contains? 4 fixture))))