Add tests for `MarkdownHelper`

spec/fixtures/markdown/io.md

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+**Strong text**

spec/fixtures/markdown/test.md

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+# Heading

spec/fixtures/markdown/twitter.md

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+@test

spec/helpers/markdown_helper_spec.rb

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+require "rails_helper"
+
+describe MarkdownHelper, :type => :helper do
+  before do
+    stub_const("APP_CONFIG", {
+      'hostname' => 'example.com',
+      'https' => true,
+      'items_per_page' => 5,
+      'allowed_hosts' => [
+        'twitter.com'
+      ]
+    })
+  end
+
+  describe '#markdown' do
+    it 'should return the expected text' do
+      expect(markdown('**Strong text**')).to eq('<p><strong>Strong text</strong></p>')
+    end
+
+    it 'should transform mentions into links' do
+      expect(markdown('@jake_weary')).to eq('<p><a href="/jake_weary">@jake_weary</a></p>')
+    end
+  end
+
+  describe '#strip_markdown' do
+    it 'should not return formatted text' do
+      expect(strip_markdown('**Strong text**')).to eq('Strong text')
+    end
+  end
+
+  describe '#twitter_markdown' do
+    context 'mentioned user has Twitter connected' do
+      let(:user) { FactoryBot.create(:user) }
+      let(:service) { Services::Twitter.create(user: user) }
+  
+      before do
+        service.nickname = 'test'
+        service.save!
+      end
+
+      it 'should transform a internal mention to a Twitter mention' do
+        expect(twitter_markdown("@#{user.screen_name}")).to eq('@test')
+      end
+    end
+
+    context 'mentioned user doesnt have Twitter connected' do
+      it 'should not transform the mention' do
+        expect(twitter_markdown('@test')).to eq('test')
+      end
+    end
+  end
+
+  describe '#question_markdown' do
+    it 'should link allowed links without the linkfilter' do
+      expect(question_markdown('https://twitter.com/retrospring')).to eq('<p><a href="https://twitter.com/retrospring" target="_blank">https://twitter.com/retrospring</a></p>')
+    end
+
+    it 'should link untrusted links with the linkfilter' do
+      expect(question_markdown('https://rrerr.net')).to eq('<p><a href="/linkfilter?url=https%3A%2F%2Frrerr.net" target="_blank">https://rrerr.net</a></p>')
+    end
+  end
+
+  describe '#raw_markdown' do
+    it 'should return the expected text' do
+      expect(raw_markdown('# Heading')).to eq("<h1>Heading</h1>\n")
+    end
+  end
+
+  describe '#get_markdown' do
+    it 'should return the contents of the specified file' do
+      expect(get_markdown('spec/fixtures/markdown/test.md')).to eq("# Heading")
+    end
+
+    it 'should return an error message on error' do
+      expect(get_markdown('non/existant/path.md')).to eq("# Error reading #{Rails.root}/non/existant/path.md")
+    end
+  end
+
+  describe '#markdown_io' do
+    it 'should return the expected text' do
+      expect(markdown_io('spec/fixtures/markdown/io.md')).to eq('<p><strong>Strong text</strong></p>')
+    end
+  end
+
+  describe '#strip_markdown_io' do
+    it 'should return the expected text' do
+      expect(strip_markdown_io('spec/fixtures/markdown/io.md')).to eq('Strong text')
+    end
+  end
+
+  describe '#twitter_markdown_io' do
+    let(:user) { FactoryBot.create(:user) }
+    let(:service) { Services::Twitter.create(user: user) }
+
+    before do
+      user.screen_name = 'test'
+      user.save!
+      service.nickname = 'ObamaGaming'
+      service.save!
+    end
+
+    it 'should return the expected text' do
+      expect(twitter_markdown_io('spec/fixtures/markdown/twitter.md')).to eq('@ObamaGaming')
+    end
+  end
+
+  describe '#raw_markdown_io' do
+    it 'should return the expected text' do
+      expect(raw_markdown_io('spec/fixtures/markdown/test.md')).to eq("<h1>Heading</h1>\n")
+    end
+  end
+end