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diff --git a/users/aspen/emacs.d/tests/splitjoin_test.el b/users/aspen/emacs.d/tests/splitjoin_test.el
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+++ b/users/aspen/emacs.d/tests/splitjoin_test.el
@@ -0,0 +1,68 @@
+;;; private/grfn/tests/splitjoin_test.el -*- lexical-binding: t; -*-
+
+(require 'ert)
+;; (load! 'splitjoin)
+;; (load! 'utils)
+; (require 'splitjoin)
+
+;;; Helpers
+
+(defvar *test-buffer* nil)
+(make-variable-buffer-local '*test-buffer*)
+
+(defun test-buffer ()
+  (when (not *test-buffer*)
+    (setq *test-buffer* (get-buffer-create "test-buffer")))
+  *test-buffer*)
+
+(defmacro with-test-buffer (&rest body)
+  `(with-current-buffer (test-buffer)
+     ,@body))
+
+(defun set-test-buffer-mode (mode)
+  (let ((mode (if (functionp mode) mode
+                (-> mode symbol-name (concat "-mode") intern))))
+    (assert (functionp mode))
+    (with-test-buffer (funcall mode))))
+
+(defmacro set-test-buffer-contents (contents)
+  (with-test-buffer
+   (erase-buffer)
+   (insert contents)))
+
+(defun test-buffer-contents ()
+  (with-test-buffer (substring-no-properties (buffer-string))))
+
+(defmacro assert-test-buffer-contents (expected-contents)
+  `(should (equal (string-trim (test-buffer-contents))
+                  (string-trim ,expected-contents))))
+
+(defmacro should-join-to (mode original-contents expected-contents)
+  `(progn
+     (set-test-buffer-mode ,mode)
+     (set-test-buffer-contents ,original-contents)
+     (with-test-buffer (+splitjoin/join))
+     (assert-test-buffer-contents ,expected-contents)))
+
+(defmacro should-split-to (mode original-contents expected-contents)
+  `(progn
+     (set-test-buffer-mode ,mode)
+     (set-test-buffer-contents ,original-contents)
+     (with-test-buffer (+splitjoin/split))
+     (assert-test-buffer-contents ,expected-contents)))
+
+(defmacro should-splitjoin (mode joined-contents split-contents)
+  `(progn
+     (should-split-to ,mode ,joined-contents ,split-contents)
+     (should-join-to  ,mode ,split-contents  ,joined-contents)))
+
+;;; Tests
+
+;; Elixir
+(ert-deftest elixir-if-splitjoin-test ()
+  (should-splitjoin 'elixir
+   "if predicate?(), do: result"
+   "if predicate?() do
+  result
+end"))
+