Separate methods for theme style and meta color tags (#29802)

spec/helpers/theme_helper_spec.rb

@@ -0,0 +1,91 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe ThemeHelper do
+  describe 'theme_style_tags' do
+    let(:result) { helper.theme_style_tags(theme) }
+
+    context 'when using system theme' do
+      let(:theme) { 'system' }
+
+      it 'returns the mastodon-light and default stylesheets with correct color schemes' do
+        expect(html_links.first.attributes.symbolize_keys)
+          .to include(
+            href: have_attributes(value: match(/mastodon-light/)),
+            media: have_attributes(value: 'not all and (prefers-color-scheme: dark)')
+          )
+        expect(html_links.last.attributes.symbolize_keys)
+          .to include(
+            href: have_attributes(value: match(/default/)),
+            media: have_attributes(value: '(prefers-color-scheme: dark)')
+          )
+      end
+    end
+
+    context 'when using other theme' do
+      let(:theme) { 'contrast' }
+
+      it 'returns the theme stylesheet without color scheme information' do
+        expect(html_links.first.attributes.symbolize_keys)
+          .to include(
+            href: have_attributes(value: match(/contrast/)),
+            media: have_attributes(value: 'all')
+          )
+      end
+    end
+  end
+
+  describe 'theme_color_tags' do
+    let(:result) { helper.theme_color_tags(theme) }
+
+    context 'when using system theme' do
+      let(:theme) { 'system' }
+
+      it 'returns the mastodon-light and default stylesheets with correct color schemes' do
+        expect(html_theme_colors.first.attributes.symbolize_keys)
+          .to include(
+            content: have_attributes(value: Themes::THEME_COLORS[:dark]),
+            media: have_attributes(value: '(prefers-color-scheme: dark)')
+          )
+        expect(html_theme_colors.last.attributes.symbolize_keys)
+          .to include(
+            content: have_attributes(value: Themes::THEME_COLORS[:light]),
+            media: have_attributes(value: '(prefers-color-scheme: light)')
+          )
+      end
+    end
+
+    context 'when using mastodon-light theme' do
+      let(:theme) { 'mastodon-light' }
+
+      it 'returns the theme stylesheet without color scheme information' do
+        expect(html_theme_colors.first.attributes.symbolize_keys)
+          .to include(
+            content: have_attributes(value: Themes::THEME_COLORS[:light])
+          )
+      end
+    end
+
+    context 'when using other theme' do
+      let(:theme) { 'contrast' }
+
+      it 'returns the theme stylesheet without color scheme information' do
+        expect(html_theme_colors.first.attributes.symbolize_keys)
+          .to include(
+            content: have_attributes(value: Themes::THEME_COLORS[:dark])
+          )
+      end
+    end
+  end
+
+  private
+
+  def html_links
+    Nokogiri::HTML5.fragment(result).css('link')
+  end
+
+  def html_theme_colors
+    Nokogiri::HTML5.fragment(result).css('meta[name=theme-color]')
+  end
+end