add test case for handling uploads without extension

spec/controllers/uploads_controller_spec.rb

@@ -170,7 +170,7 @@ describe UploadsController do
       expect(response.response_code).to eq(404)
     end
 
-    it "returns 404 when the upload doens't exist" do
+    it "returns 404 when the upload doesn't exist" do
       Upload.stubs(:find_by).returns(nil)
 
       get :show, site: site, sha: sha, extension: "pdf"
@@ -187,6 +187,16 @@ describe UploadsController do
       get :show, site: site, sha: sha, extension: "zip"
     end
 
+    it "handles file without extension" do
+      SiteSetting.authorized_extensions = "*"
+      upload = Fabricate(:upload, original_filename: "image_file", sha1: sha)
+      controller.stubs(:render)
+      controller.expects(:send_file)
+
+      get :show, site: site, sha: sha
+      expect(response).to be_success
+    end
+
     context "prevent anons from downloading files" do
 
       before { SiteSetting.stubs(:prevent_anons_from_downloading_files).returns(true) }