FEATURE: Add quote-modified class if a quote has been modified

spec/components/quote_comparer_spec.rb

@@ -0,0 +1,41 @@
+require 'rails_helper'
+require 'quote_comparer'
+
+describe QuoteComparer do
+
+  describe "#modified?" do
+    let(:post) { Fabricate(:post, raw: "This has **text** we _are_ matching") }
+
+    def qc(text)
+      QuoteComparer.new(post.topic_id, post.post_number, text)
+    end
+
+    it "returns true for no post" do
+      expect(QuoteComparer.new(nil, nil, "test")).to be_modified
+    end
+
+    it "returns true for nil text" do
+      expect(qc(nil)).to be_modified
+    end
+
+    it "returns true for empty text" do
+      expect(qc("")).to be_modified
+    end
+
+    it "returns true for modified text" do
+      expect(qc("text is modified")).to be_modified
+    end
+
+    it "return false when the text matches exactly" do
+      expect(qc("This has text we are matching")).not_to be_modified
+    end
+
+    it "return false when there's a substring" do
+      expect(qc("text we are")).not_to be_modified
+    end
+
+    it "return false when there's extra space" do
+      expect(qc("\n\ntext   we are \t")).not_to be_modified
+    end
+  end
+end