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diff --git a/spec/lib/banzai/filter/gollum_tags_filter_spec.rb b/spec/lib/banzai/filter/gollum_tags_filter_spec.rb
new file mode 100644
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+++ b/spec/lib/banzai/filter/gollum_tags_filter_spec.rb
@@ -0,0 +1,104 @@
+require 'spec_helper'
+
+describe Banzai::Filter::GollumTagsFilter, lib: true do
+  include FilterSpecHelper
+
+  let(:project) { create(:project) }
+  let(:user) { double }
+  let(:project_wiki) { ProjectWiki.new(project, user) }
+
+  describe 'validation' do
+    it 'ensure that a :project_wiki key exists in context' do
+      expect { filter("See [[images/image.jpg]]", {}) }.to raise_error ArgumentError, "Missing context keys for Banzai::Filter::GollumTagsFilter: :project_wiki"
+    end
+  end
+
+  context 'linking internal images' do
+    it 'creates img tag if image exists' do
+      file = Gollum::File.new(project_wiki.wiki)
+      expect(file).to receive(:path).and_return('images/image.jpg')
+      expect(project_wiki).to receive(:find_file).with('images/image.jpg').and_return(file)
+
+      tag = '[[images/image.jpg]]'
+      doc = filter("See #{tag}", project_wiki: project_wiki)
+
+      expect(doc.at_css('img')['src']).to eq "#{project_wiki.wiki_base_path}/images/image.jpg"
+    end
+
+    it 'does not creates img tag if image does not exist' do
+      expect(project_wiki).to receive(:find_file).with('images/image.jpg').and_return(nil)
+
+      tag = '[[images/image.jpg]]'
+      doc = filter("See #{tag}", project_wiki: project_wiki)
+
+      expect(doc.css('img').size).to eq 0
+    end
+  end
+
+  context 'linking external images' do
+    it 'creates img tag for valid URL' do
+      tag = '[[http://example.com/image.jpg]]'
+      doc = filter("See #{tag}", project_wiki: project_wiki)
+
+      expect(doc.at_css('img')['src']).to eq "http://example.com/image.jpg"
+    end
+
+    it 'does not creates img tag for invalid URL' do
+      tag = '[[http://example.com/image.pdf]]'
+      doc = filter("See #{tag}", project_wiki: project_wiki)
+
+      expect(doc.css('img').size).to eq 0
+    end
+  end
+
+  context 'linking external resources' do
+    it "the created link's text will be equal to the resource's text" do
+      tag = '[[http://example.com]]'
+      doc = filter("See #{tag}", project_wiki: project_wiki)
+
+      expect(doc.at_css('a').text).to eq 'http://example.com'
+      expect(doc.at_css('a')['href']).to eq 'http://example.com'
+    end
+
+    it "the created link's text will be link-text" do
+      tag = '[[link-text|http://example.com/pdfs/gollum.pdf]]'
+      doc = filter("See #{tag}", project_wiki: project_wiki)
+
+      expect(doc.at_css('a').text).to eq 'link-text'
+      expect(doc.at_css('a')['href']).to eq 'http://example.com/pdfs/gollum.pdf'
+    end
+  end
+
+  context 'linking internal resources' do
+    it "the created link's text will be equal to the resource's text" do
+      tag = '[[wiki-slug]]'
+      doc = filter("See #{tag}", project_wiki: project_wiki)
+
+      expect(doc.at_css('a').text).to eq 'wiki-slug'
+      expect(doc.at_css('a')['href']).to eq 'wiki-slug'
+    end
+
+    it "the created link's text will be link-text" do
+      tag = '[[link-text|wiki-slug]]'
+      doc = filter("See #{tag}", project_wiki: project_wiki)
+
+      expect(doc.at_css('a').text).to eq 'link-text'
+      expect(doc.at_css('a')['href']).to eq 'wiki-slug'
+    end
+  end
+
+  context 'table of contents' do
+    it 'replaces [[<em>TOC</em>]] with ToC result' do
+      doc = described_class.call("<p>[[<em>TOC</em>]]</p>", { project_wiki: project_wiki }, { toc: "FOO" })
+
+      expect(doc.to_html).to eq("FOO")
+    end
+
+    it 'handles an empty ToC result' do
+      input = "<p>[[<em>TOC</em>]]</p>"
+      doc = described_class.call(input, project_wiki: project_wiki)
+
+      expect(doc.to_html).to eq ''
+    end
+  end
+end