Use with-simulated-input for tests

tests/test-counsel-projectile.el

@@ -1,13 +1,43 @@
 ;;; test-counsel-projectile.el --- Buttercup tests for counsel-projectile  -*- lexical-binding: t; -*-
 ;;; Commentary:
 ;;; Code:
-
-(require 'buttercup)
+(require 'with-simulated-input)
 (require 'counsel-projectile)
 
 ;; Example test!
-(describe "A suite"
-  (it "contains a spec with an expectation"
-      (expect counsel-projectile--buffers :to-be nil)))
+(describe "counsel-projectile-switch-project with a mock"
+  (before-each
+    (spy-on 'ivy-read)
+    (spy-on 'projectile-project-root :and-return-value "/usr/fake-project")
+    (setq
+      projectile-known-projects '("/usr/fake-project" "~/some-project")
+      counsel-projectile-switch-project-action 'counsel-projectile-switch-project-action))
 
+  (it "spies on ivy-read arguments"
+    (counsel-projectile-switch-project)
+    (expect 'projectile-project-root :to-have-been-called)
+
+    (expect 'ivy-read :to-have-been-called-with
+      "[fake-project] Switch to project: "
+      '("/usr/fake-project" "~/some-project")
+      :preselect "/usr/fake-project"
+      :action counsel-projectile-switch-project-action
+      :require-match t
+      :sort nil
+      :caller 'counsel-projectile-switch-project)))
+
+(describe "counsel-projectile-switch-project with the real ivy-read"
+  (before-each
+    (spy-on 'projectile-project-root :and-return-value "/usr/fake-project")
+    (setq
+      counsel-projectile-switch-project-action 'counsel-projectile-switch-project-action))
+
+  (it "signals error when project is unknown"
+    (expect
+      (with-simulated-input "/usr/fake RET"
+        (condition-case err
+          (counsel-projectile-switch-project)
+          (file-missing
+            (error-message-string err))))
+      :to-equal "Setting current directory: No such file or directory, /usr/fake-project")))
 ;;; test-counsel-projectile.el ends here