1 files changed, 179 insertions, 0 deletions
diff --git a/spec/lib/banzai/filter/label_reference_filter_spec.rb b/spec/lib/banzai/filter/label_reference_filter_spec.rb
new file mode 100644
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+++ b/spec/lib/banzai/filter/label_reference_filter_spec.rb
@@ -0,0 +1,179 @@
+require 'spec_helper'
+require 'html/pipeline'
+
+describe Banzai::Filter::LabelReferenceFilter, lib: true do
+  include FilterSpecHelper
+
+  let(:project)   { create(:empty_project, :public) }
+  let(:label)     { create(:label, project: project) }
+  let(:reference) { label.to_reference }
+
+  it 'requires project context' do
+    expect { described_class.call('') }.to raise_error(ArgumentError, /:project/)
+  end
+
+  %w(pre code a style).each do |elem|
+    it "ignores valid references contained inside '#{elem}' element" do
+      exp = act = "<#{elem}>Label #{reference}</#{elem}>"
+      expect(reference_filter(act).to_html).to eq exp
+    end
+  end
+
+  it 'includes default classes' do
+    doc = reference_filter("Label #{reference}")
+    expect(doc.css('a').first.attr('class')).to eq 'gfm gfm-label'
+  end
+
+  it 'includes a data-project attribute' do
+    doc = reference_filter("Label #{reference}")
+    link = doc.css('a').first
+
+    expect(link).to have_attribute('data-project')
+    expect(link.attr('data-project')).to eq project.id.to_s
+  end
+
+  it 'includes a data-label attribute' do
+    doc = reference_filter("See #{reference}")
+    link = doc.css('a').first
+
+    expect(link).to have_attribute('data-label')
+    expect(link.attr('data-label')).to eq label.id.to_s
+  end
+
+  it 'supports an :only_path context' do
+    doc = reference_filter("Label #{reference}", only_path: true)
+    link = doc.css('a').first.attr('href')
+
+    expect(link).not_to match %r(https?://)
+    expect(link).to eq urls.namespace_project_issues_path(project.namespace, project, label_name: label.name)
+  end
+
+  it 'adds to the results hash' do
+    result = reference_pipeline_result("Label #{reference}")
+    expect(result[:references][:label]).to eq [label]
+  end
+
+  describe 'label span element' do
+    it 'includes default classes' do
+      doc = reference_filter("Label #{reference}")
+      expect(doc.css('a span').first.attr('class')).to eq 'label color-label'
+    end
+
+    it 'includes a style attribute' do
+      doc = reference_filter("Label #{reference}")
+      expect(doc.css('a span').first.attr('style')).to match(/\Abackground-color: #\h{6}; color: #\h{6}\z/)
+    end
+  end
+
+  context 'Integer-based references' do
+    it 'links to a valid reference' do
+      doc = reference_filter("See #{reference}")
+
+      expect(doc.css('a').first.attr('href')).to eq urls.
+        namespace_project_issues_url(project.namespace, project, label_name: label.name)
+    end
+
+    it 'links with adjacent text' do
+      doc = reference_filter("Label (#{reference}.)")
+      expect(doc.to_html).to match(%r(\(<a.+><span.+>#{label.name}</span></a>\.\)))
+    end
+
+    it 'ignores invalid label IDs' do
+      exp = act = "Label #{invalidate_reference(reference)}"
+
+      expect(reference_filter(act).to_html).to eq exp
+    end
+  end
+
+  context 'String-based single-word references' do
+    let(:label)     { create(:label, name: 'gfm', project: project) }
+    let(:reference) { "#{Label.reference_prefix}#{label.name}" }
+
+    it 'links to a valid reference' do
+      doc = reference_filter("See #{reference}")
+
+      expect(doc.css('a').first.attr('href')).to eq urls.
+        namespace_project_issues_url(project.namespace, project, label_name: label.name)
+      expect(doc.text).to eq 'See gfm'
+    end
+
+    it 'links with adjacent text' do
+      doc = reference_filter("Label (#{reference}.)")
+      expect(doc.to_html).to match(%r(\(<a.+><span.+>#{label.name}</span></a>\.\)))
+    end
+
+    it 'ignores invalid label names' do
+      exp = act = "Label #{Label.reference_prefix}#{label.name.reverse}"
+
+      expect(reference_filter(act).to_html).to eq exp
+    end
+  end
+
+  context 'String-based multi-word references in quotes' do
+    let(:label)     { create(:label, name: 'gfm references', project: project) }
+    let(:reference) { label.to_reference(:name) }
+
+    it 'links to a valid reference' do
+      doc = reference_filter("See #{reference}")
+
+      expect(doc.css('a').first.attr('href')).to eq urls.
+        namespace_project_issues_url(project.namespace, project, label_name: label.name)
+      expect(doc.text).to eq 'See gfm references'
+    end
+
+    it 'links with adjacent text' do
+      doc = reference_filter("Label (#{reference}.)")
+      expect(doc.to_html).to match(%r(\(<a.+><span.+>#{label.name}</span></a>\.\)))
+    end
+
+    it 'ignores invalid label names' do
+      exp = act = %(Label #{Label.reference_prefix}"#{label.name.reverse}")
+
+      expect(reference_filter(act).to_html).to eq exp
+    end
+  end
+
+  describe 'edge cases' do
+    it 'gracefully handles non-references matching the pattern' do
+      exp = act = '(format nil "~0f" 3.0) ; 3.0'
+      expect(reference_filter(act).to_html).to eq exp
+    end
+  end
+
+  describe 'referencing a label in a link href' do
+    let(:reference) { %Q{<a href="#{label.to_reference}">Label</a>} }
+
+    it 'links to a valid reference' do
+      doc = reference_filter("See #{reference}")
+
+      expect(doc.css('a').first.attr('href')).to eq urls.
+        namespace_project_issues_url(project.namespace, project, label_name: label.name)
+    end
+
+    it 'links with adjacent text' do
+      doc = reference_filter("Label (#{reference}.)")
+      expect(doc.to_html).to match(%r(\(<a.+>Label</a>\.\)))
+    end
+
+    it 'includes a data-project attribute' do
+      doc = reference_filter("Label #{reference}")
+      link = doc.css('a').first
+
+      expect(link).to have_attribute('data-project')
+      expect(link.attr('data-project')).to eq project.id.to_s
+    end
+
+    it 'includes a data-label attribute' do
+      doc = reference_filter("See #{reference}")
+      link = doc.css('a').first
+
+      expect(link).to have_attribute('data-label')
+      expect(link.attr('data-label')).to eq label.id.to_s
+    end
+
+    it 'adds to the results hash' do
+      result = reference_pipeline_result("Label #{reference}")
+      expect(result[:references][:label]).to eq [label]
+    end
+  end
+end