Move unit tests from ert to buttercup

Easier to organize and write. Now I can hopefully strive for better
coverage!

modules/ui/doom-dashboard/test/test-doom-dashboard.el

@@ -0,0 +1,40 @@
+;; -*- no-byte-compile: t; -*-
+;;; ui/doom-dashboard/test/test-doom-dashboard.el
+
+(require! :ui doom-dashboard)
+
+(describe "ui/doom-dashboard"
+  :var (default-directory projectile-enable-caching)
+  (before-all
+    (require 'projectile)
+    (setq projectile-enable-caching nil))
+  (after-all
+    (unload-feature 'projectile t))
+
+  (before-each (projectile-mode +1))
+  (after-each  (projectile-mode +1))
+
+  (describe "get-pwd"
+    :var (+doom-dashboard--last-cwd)
+    (before-each
+      (setq +doom-dashboard--last-cwd doom-core-dir
+            default-directory doom-core-dir))
+    (it "returns the current directory when policy is nil"
+      (let (+doom-dashboard-pwd-policy)
+        (expect (+doom-dashboard--get-pwd) :to-equal default-directory)))
+    (it "returns a path if policy is a path"
+      (let ((+doom-dashboard-pwd-policy "~"))
+        (expect (+doom-dashboard--get-pwd) :to-equal (expand-file-name "~"))))
+    (it "returns return value of policy as a function"
+      (let ((+doom-dashboard-pwd-policy (lambda (x) "x")))
+        (expect (+doom-dashboard--get-pwd) :to-equal "x")))
+    (it "returns last cwd if policy is 'last"
+      (let ((+doom-dashboard-pwd-policy 'last))
+        (expect (+doom-dashboard--get-pwd) :to-equal doom-core-dir)))
+    (it "returns last project if policy is 'last-project"
+      (let ((+doom-dashboard-pwd-policy 'last-project))
+        (expect (+doom-dashboard--get-pwd) :to-equal doom-emacs-dir))))
+
+  (describe "dashboard-p"
+    (it "changes the fallback buffer to the dashboard buffer"
+      (expect (+doom-dashboard-p (doom-fallback-buffer))))))