diff --git a/Makefile b/Makefile
index e5af8d5..0719778 100644
--- a/Makefile
+++ b/Makefile
@@ -18,3 +18,11 @@ build:
 	--eval '(ql:quickload :eksd/unix)' \
 	--eval '(asdf:make :eksd/unix)' \
 	--eval '(quit)'
+
+test:
+	$(LISP) --load eksd.asd \
+	--eval '(ql:quickload :eksd)' \
+	--eval '(ql:quickload :eksd/unix)' \
+	--eval '(asdf:test-system :eksd)' \
+	--eval '(asdf:test-system :eksd/unix)' \
+	--eval '(quit)'
diff --git a/eksd.asd b/eksd.asd
index 5c902eb..ce24aba 100644
--- a/eksd.asd
+++ b/eksd.asd
@@ -7,7 +7,9 @@
   :homepage "https://hak.xwx.moe/jadedctrl/eksd"
   :description "For reading files into hex— `xxd`-like with text-tables."
   :depends-on ()
-  :components ((:file "src/eksd")))
+  :components ((:file "src/eksd"))
+  :in-order-to ((test-op (test-op "eksd/tests"))
+                (build-op (build-op "eksd/unix"))))
 
 (asdf:defsystem "eksd/unix"
   :version "0.11"
@@ -20,4 +22,40 @@
   :build-pathname "eksd"
   :entry-point "eksd/unix:main"
   :depends-on (:cl-strings :eksd :unix-opts)
-  :components ((:file "src/unix")))
+  :components ((:file "src/unix"))
+  :in-order-to ((test-op (test-op "eksd/unix/tests"))))
+
+
+
+;;; Tests
+;;; —————————————————————————————————————
+(asdf:defsystem "eksd/tests"
+  :version "0.11"
+  :license "GPLv3"
+  :author "Jaidyn Ann <jadedctrl@posteo.at>"
+  :homepage "https://hak.xwx.moe/jadedctrl/eksd"
+  :description "Tests for the the eksd package."
+  :depends-on (:eksd :lisp-unit2)
+  :components ((:file "t/eksd")))
+
+(asdf:defsystem "eksd/unix/tests"
+  :version "0.11"
+  :license "GPLv3"
+  :author "Jaidyn Ann <jadedctrl@posteo.at>"
+  :homepage "https://hak.xwx.moe/jadedctrl/eksd"
+  :description "Tests for the eksd.unix package."
+  :depends-on (:eksd/unix :lisp-unit2)
+  :components ((:file "t/unix")))
+
+
+;; Following methods borrowed from lisp-unit2’s documentation:
+;; https://github.com/AccelerationNet/lisp-unit2/blob/master/README.md#asdf
+(defmethod asdf:perform ((o asdf:test-op) (c (eql (asdf:find-system :eksd/tests))))
+  (eval (read-from-string
+         "(lisp-unit2:with-summary ()
+            (lisp-unit2:run-tests :package :eksd/tests))")))
+
+(defmethod asdf:perform ((o asdf:test-op) (c (eql (asdf:find-system :eksd/unix/tests))))
+  (eval (read-from-string
+         "(lisp-unit2:with-summary ()
+            (lisp-unit2:run-tests :package :eksd/unix/tests))")))
diff --git a/t/eksd.lisp b/t/eksd.lisp
new file mode 100644
index 0000000..ee7885c
--- /dev/null
+++ b/t/eksd.lisp
@@ -0,0 +1,26 @@
+;;;; eksd.tests: Tests for eksd package.
+
+;; Copyright © 2024 Jaidyn Ann <jadedctrl@posteo.at>
+;;
+;; This program is free software: you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation, either version 3 of
+;; the License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+(defpackage :eksd/tests
+  (:use :cl :lisp-unit2)
+  (:export :char-hex.space))
+
+(in-package :eksd/tests)
+
+(define-test char-hex.space
+    (:tags '(char-hex))
+    (assert-equal (eksd::char-hex #\space) "20"))
diff --git a/t/unix.lisp b/t/unix.lisp
new file mode 100644
index 0000000..d357399
--- /dev/null
+++ b/t/unix.lisp
@@ -0,0 +1,27 @@
+;;;; eksd.unix.tests: Tests for eksd’s UNIX frontend package.
+
+;; Copyright © 2024 Jaidyn Ann <jadedctrl@posteo.at>
+;;
+;; This program is free software: you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation, either version 3 of
+;; the License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+(defpackage :eksd/unix/tests
+  (:use :cl :lisp-unit2)
+  (:export :de-tail))
+
+(in-package :eksd/unix/tests)
+
+(define-test de-tail
+    (:tags '(de-tail))
+  (assert-equal (eksd/unix::de-tail '(1 2 3))
+                '(1 2)))