1 files changed, 23 insertions, 0 deletions
diff --git a/activestorage/test/previewer/mupdf_previewer_test.rb b/activestorage/test/previewer/mupdf_previewer_test.rb
new file mode 100644
index 0000000000..6c2db6fcbf
--- /dev/null
+++ b/activestorage/test/previewer/mupdf_previewer_test.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require "test_helper"
+require "database/setup"
+
+require "active_storage/previewer/mupdf_previewer"
+
+class ActiveStorage::Previewer::MuPDFPreviewerTest < ActiveSupport::TestCase
+  setup do
+    @blob = create_file_blob(filename: "report.pdf", content_type: "application/pdf")
+  end
+
+  test "previewing a PDF document" do
+    ActiveStorage::Previewer::MuPDFPreviewer.new(@blob).preview do |attachable|
+      assert_equal "image/png", attachable[:content_type]
+      assert_equal "report.png", attachable[:filename]
+
+      image = MiniMagick::Image.read(attachable[:io])
+      assert_equal 612, image.width
+      assert_equal 792, image.height
+    end
+  end
+end