vormwald · vormwald · Aug 23, 2026 · Aug 16, 2026 · Aug 16, 2026 · Aug 22, 2026
diff --git a/Gemfile b/Gemfile
@@ -12,13 +12,14 @@ gem "standard", "~> 1.3"
 
 # needed as a jekyll dependency since ruby 3.4/4.0 removed them
 gem "csv"
-gem "base64"
 gem "logger"
+gem "base64"
 
 # transitive deps whose newer releases require ruby >= 3.2; CI still tests ruby 3.1
 gem "rdoc", "< 8" # rdoc 8 requires ruby >= 3.2 and pulls in rbs (also >= 3.2)
 gem "erb", "< 5" # erb >= 6 requires ruby >= 3.2
 gem "sass-embedded", "< 1.77.1" # sass-embedded >= 1.77.1 requires ruby >= 3.2
+gem "google-protobuf", "< 4.36" # google-protobuf >= 4.36 requires ruby >= 3.2
 
 group :development, :test do
   gem "irb", "~> 1.14"

diff --git a/Gemfile.lock b/Gemfile.lock
@@ -24,11 +24,19 @@ GEM
     erb (4.0.4.1)
       cgi (>= 0.3.3)
     eventmachine (1.2.7)
-    ffi (1.17.1)
+    ffi (1.17.4)
+    ffi (1.17.4-arm64-darwin)
+    ffi (1.17.4-x86_64-linux-gnu)
     forwardable-extended (2.6.0)
-    google-protobuf (4.33.6)
+    google-protobuf (4.35.1)
       bigdecimal
-      rake (>= 13)
+      rake (~> 13.3)
+    google-protobuf (4.35.1-arm64-darwin)
+      bigdecimal
+      rake (~> 13.3)
+    google-protobuf (4.35.1-x86_64-linux-gnu)
+      bigdecimal
+      rake (~> 13.3)
     http_parser.rb (0.8.0)
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
@@ -90,7 +98,7 @@ GEM
     public_suffix (6.0.1)
     racc (1.8.1)
     rainbow (3.1.1)
-    rake (13.2.1)
+    rake (13.4.2)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
@@ -136,6 +144,8 @@ GEM
     sass-embedded (1.77.0)
       google-protobuf (>= 3.25, < 5.0)
       rake (>= 13.0.0)
+    sass-embedded (1.77.0-arm64-darwin)
+      google-protobuf (>= 3.25, < 5.0)
     sass-embedded (1.77.0-x86_64-linux-gnu)
       google-protobuf (>= 3.25, < 5.0)
     standard (1.44.0)
@@ -152,6 +162,7 @@ GEM
       rubocop-performance (~> 1.23.0)
     stringio (3.2.0)
     tailwindcss-ruby (4.0.6)
+    tailwindcss-ruby (4.0.6-arm64-darwin)
     tailwindcss-ruby (4.0.6-x86_64-linux-gnu)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
@@ -160,13 +171,15 @@ GEM
     webrick (1.9.1)
 
 PLATFORMS
+  arm64-darwin
   ruby
   x86_64-linux
 
 DEPENDENCIES
   base64
   csv
   erb (< 5)
+  google-protobuf (< 4.36)
   irb (~> 1.14)
   jekyll (~> 4.3)
   jekyll-tailwindcss!

diff --git a/spec/fixtures/site/_config.yml b/spec/fixtures/site/_config.yml
@@ -0,0 +1 @@
+title: Integration Spec Fixture Site
diff --git a/spec/fixtures/site/_layouts/default.html b/spec/fixtures/site/_layouts/default.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <link rel="stylesheet" href="/assets/css/styles.css">
+  </head>
+  <body>
+    <h1 class="text-center font-bold">{{ page.title }}</h1>
+    {{ content }}
+  </body>
+</html>
diff --git a/spec/fixtures/site/_tailwind.css b/spec/fixtures/site/_tailwind.css
@@ -0,0 +1 @@
+@import "tailwindcss";
diff --git a/spec/fixtures/site/assets/css/styles.tailwindcss b/spec/fixtures/site/assets/css/styles.tailwindcss
@@ -0,0 +1,3 @@
+---
+---
+This file is just a placeholder. Its content will be replaced by output from the tailwindcss CLI.
diff --git a/spec/fixtures/site/index.md b/spec/fixtures/site/index.md
@@ -0,0 +1,6 @@
+---
+layout: default
+title: Home
+---
+
+Hello from the integration spec fixture site.
diff --git a/spec/integration/build_spec.rb b/spec/integration/build_spec.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+require "jekyll"
+require "tmpdir"
+require "fileutils"
+
+RSpec.describe "building a Jekyll site with the real tailwindcss CLI" do
+  let(:fixture_source) { File.expand_path("../fixtures/site", __dir__) }
+
+  it "generates real tailwind-compiled CSS into _site" do
+    Dir.mktmpdir do |tmp|
+      # Build from a throwaway copy of the fixture: Jekyll writes its disk cache
+      # (.jekyll-cache) under the site source, so building in place would leave
+      # artifacts behind in the repository.
+      source = File.join(tmp, "site")
+      destination = File.join(tmp, "_site")
+      FileUtils.cp_r(fixture_source, source)
+
+      # The plugin resolves the tailwind css config path (default "./_tailwind.css")
+      # relative to the process working directory rather than the site source,
+      # so the site being built must be the cwd for the build to find it.
+      Dir.chdir(source) do
+        config = Jekyll.configuration(
+          "source" => source,
+          "destination" => destination,
+          "quiet" => true
+        )
+        site = Jekyll::Site.new(config)
+        site.process
+      end
+
+      generated_css_path = File.join(destination, "assets", "css", "styles.css")
+
+      expect(File).to exist(generated_css_path)
+
+      generated_css = File.read(generated_css_path)
+      expect(generated_css).not_to be_empty
+      expect(generated_css).to match(/text-center/)
+    end
+  end
+end