diff --git a/.gitignore b/.gitignore
index cf4091d..620829d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
+.cask/
 git-auto-commit-mode.elc
diff --git a/Cask b/Cask
new file mode 100644
index 0000000..b78c7f2
--- /dev/null
+++ b/Cask
@@ -0,0 +1,5 @@
+(source gnu)
+(source melpa)
+
+(development
+ (depends-on "buttercup"))
diff --git a/git-auto-commit-mode.el b/git-auto-commit-mode.el
index 33ffa1a..4fc6315 100644
--- a/git-auto-commit-mode.el
+++ b/git-auto-commit-mode.el
@@ -164,6 +164,15 @@ should already have been set up."
                             actual-buffer)
                gac--debounce-timers))))
 
+(defun gac--buffer-is-tracked (buffer)
+  "Check to see if BUFFER’s file is tracked in git."
+  (let ((file-name (convert-standard-filename
+                    (file-name-nondirectory
+                     (buffer-file-name buffer)))))
+    (not (string=
+          (shell-command-to-string (concat "git ls-files " file-name))
+          ""))))
+
 (defun gac--buffer-has-changes (buffer)
   "Check to see if there is any change in BUFFER."
   (let ((file-name (convert-standard-filename
@@ -176,7 +185,8 @@ should already have been set up."
 (defun gac--after-save (buffer)
   (unwind-protect
       (when (and (buffer-live-p buffer)
-                 (gac--buffer-has-changes buffer))
+                 (or (not (gac--buffer-is-tracked buffer))
+                     (gac--buffer-has-changes buffer)))
         (gac-commit buffer)
         (with-current-buffer buffer
           ;; with-current-buffer required here because gac-automatically-push-p
diff --git a/tests/git-auto-commit-mode-tests.el b/tests/git-auto-commit-mode-tests.el
new file mode 100644
index 0000000..8e7c291
--- /dev/null
+++ b/tests/git-auto-commit-mode-tests.el
@@ -0,0 +1,48 @@
+;;; git-auto-commit-mode-tests.el --- Tests for git-auto-commit-mode  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2019  Tom Willemse
+
+;; Author: Tom Willemse <tom@ryuslash.org>
+;; Keywords:
+
+;; 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/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(require 'buttercup)
+(require 'git-auto-commit-mode)
+
+(describe "New files"
+  (it "Should be added to git"
+    (let* ((temp-dir (make-temp-file "gac-" t))
+           (temp-file (expand-file-name "test" temp-dir))
+           (default-directory temp-dir))
+      (unwind-protect
+          (progn
+            (shell-command "git init")
+            (let ((buffer (find-file-noselect temp-file)))
+              (with-current-buffer buffer
+                (git-auto-commit-mode)
+                (insert "test")
+                (save-buffer)))
+            (expect (shell-command-to-string "git log --format=format:%s")
+                    :to-match (rx string-start "test" string-end)))
+        (delete-directory temp-dir t)))))
+
+(provide 'git-auto-commit-mode-tests)
+;;; git-auto-commit-mode-tests.el ends here