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+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'ert)
+(require 'al)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(ert-deftest al-has-key? ()
+  (should (al-has-key? 'fname '((fname . "William"))))
+  (should (not (al-has-key? 'lname '((fname . "William"))))))
+
+(ert-deftest al-get ()
+  (let ((xs (->> (al-new)
+                 (al-set 'fname "John")
+                 (al-set 'employed? nil))))
+    (should (string= "John" (al-get 'fname xs)))
+    (should (string= "Cleese" (al-get 'lname xs "Cleese")))
+    ;; Test that the value of nil is returned even when a default is defined,
+    ;; which could be a subtle bug in the typical Elisp pattern of supporting
+    ;; defaults with: (or foo default).
+    (should (eq nil (al-get 'employed? xs)))
+    (should (eq nil (al-get 'employed? xs "default")))))
+
+(ert-deftest al-has-value? ()
+  (should (al-has-value? "William" '((fname . "William"))))
+  (should (not (al-has-key? "John" '((fname . "William"))))))
+
+(ert-deftest al-map-keys ()
+  (should
+   (equal '((2 . one)
+            (3 . two))
+          (al-map-keys #'1+
+                       '((1 . one)
+                         (2 . two))))))
+
+(ert-deftest al-map-values ()
+  (should (equal '((one . 2)
+                   (two . 3))
+                 (al-map-values #'1+
+                                '((one . 1)
+                                  (two . 2))))))
+
+(ert-deftest al-delete ()
+  (let ((person (->> (al-new)
+                     (al-set "fname" "John")
+                     (al-set "lname" "Cleese")
+                     (al-set "age" 82))))
+    (should (al-has-key? "age" person))
+    (should (not (al-has-key? "age" (al-delete "age" person))))))