Add model spec for syntax highlight

Author: rossta

app/models/settings/syntax_highlight.rb

@@ -6,29 +6,34 @@ def self.default
   end
 
   def self.find(name)
-    attrs = curated_data.find { |attrs| attrs[:name] == name }
-    if attrs.present?
-      new(**attrs)
-    else
-      raise ActiveRecord::RecordNotFound, "Couldn't find SyntaxHighlight with name '#{name}'"
-    end
+    instance = curated.find { |obj| obj.name == name }
+    instance.presence or raise ActiveRecord::RecordNotFound, "Couldn't find SyntaxHighlight with name '#{name}'"
   end
 
+  # This method lazily reifies and memoizes curated SyntaxHighlight instances. I may
+  # want to consider a more sophisticated caching strategy.
   def self.curated
-    curated_data.map { |attrs| new(**attrs) }
+    @curated ||= curated_data.map { |attrs| new(**attrs) }
+  end
+
+  def self.all
+    curated
   end
 
   def self.curated_data
     @curated_data ||= YAML.load_file(Rails.root.join("config", "syntax_highlights.yml"))
   end
 
-  attr_accessor :name, :mode
+  attr_accessor :name, :mode, :background_color
 
-  def initialize(name:, mode:, **)
+  def initialize(name:, mode:, background_color:, **)
     @name = name
     @mode = mode
+    @background_color = background_color
   end
 
+  def id = name
+
   def display_name
     name.titleize
   end

spec/models/settings/syntax_highlight_spec.rb

@@ -0,0 +1,19 @@
+require "rails_helper"
+
+RSpec.describe Settings::SyntaxHighlight, type: :request do
+  describe "#==" do
+    it { expect(described_class.find("dracula")).to eq(described_class.find("dracula")) }
+    it { expect(described_class.find("darcula")).not_to eq(described_class.find("dracula")) }
+    it { expect(described_class.find("darcula")).not_to eq("darcula") }
+  end
+
+  describe ".curated" do
+    it "represents the files in the curated directory" do
+      assets = Dir.glob(Rails.root.join("app", "assets", "stylesheets", "pygments", "*.css"))
+
+      expect(described_class.curated.map { |s| s.path.to_s }).to match_array(assets),
+        "Expected the curated syntax highlights to match CSS files in pygments css directory. " \
+        "You may need to run `rake syntax_highlights:seed` to update the curated syntax highlights."
+    end
+  end
+end