1 files changed, 10 insertions, 0 deletions

diff --git a/test/models/helpers/admin_helper_test.rb b/test/models/helpers/admin_helper_test.rb
index 23d9f40..94e9861 100644
--- a/test/models/helpers/admin_helper_test.rb
+++ b/test/models/helpers/admin_helper_test.rb
@@ -1,4 +1,14 @@
 require 'test_helper'
 
 class AdminHelperTest < ActionView::TestCase
+  test "mtime_busted_path appends the file's real mtime as a query param" do
+    path = "/stylesheets/admin.css"
+    expected_mtime = File.mtime(Rails.public_path.join("stylesheets/admin.css")).to_i
+
+    assert_equal "#{path}?v=#{expected_mtime}", mtime_busted_path(path)
+  end
+
+  test "mtime_busted_path raises clearly for a missing file rather than silently omitting the version" do
+    assert_raises(RuntimeError) { mtime_busted_path("/stylesheets/does_not_exist.css") }
+  end
 end