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diff --git a/spec/integration_spec.rb b/spec/integration_spec.rb
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+++ b/spec/integration_spec.rb
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+require_relative 'spec_helper'
+
+require 'asciidoctor/interdoc_reftext/processor'
+require 'asciidoctor'
+require 'corefines'
+
+using Corefines::String::unindent
+using Corefines::Hash::except
+
+FIXTURES_DIR = File.expand_path('fixtures', __dir__)
+
+
+describe 'Intengration Tests' do
+
+  subject(:output) { Asciidoctor.convert(input, options) }
+
+  let(:input) { '' }  # this is modified in #given
+  let(:processor) { Asciidoctor::InterdocReftext::Processor.new }
+
+  let(:options) {
+    processor_ = processor
+    {
+      safe: :safe,
+      header_footer: false,
+      base_dir: FIXTURES_DIR,
+      extensions: proc { tree_processor processor_ },
+    }
+  }
+
+  context 'document with valid inter-document xref without reftext' do
+
+    context 'without fragment' do
+      it 'renders title of the referenced document as reftext' do
+        given 'xref:doc-a#[]'
+        should have_anchor href: 'doc-a.html', text: 'Document A'
+      end
+    end
+
+    context 'with fragment' do
+      it 'renders title of the referenced section with implicit id as reftext' do
+        given 'xref:doc-a#_first_section[]'
+        should have_anchor href: 'doc-a.html#_first_section', text: 'First Section'
+      end
+
+      it 'renders title of the referenced section with explicit id as reftext' do
+        given 'xref:doc-a#sec2[]'
+        should have_anchor href: 'doc-a.html#sec2', text: 'Second Section'
+      end
+
+      it 'renders reftext of the referenced section with explicit reftext' do
+        given 'xref:doc-a#_third_section[]'
+        should have_anchor href: 'doc-a.html#_third_section', text: '3rd Section'
+      end
+    end
+
+    context 'with relative path' do
+      subject(:output) do
+        opts = options.except(:base_dir)
+        Asciidoctor.load_file("#{FIXTURES_DIR}/b/doc-b.adoc", opts).convert
+      end
+
+      it 'resolves path relative to the current document' do
+        should have_anchor href: 'c/doc-c.html', text: 'Document C'
+      end
+    end
+
+    context 'when extension is not active' do
+      specify 'renders path of the referenced document as reftext' do
+        given 'xref:doc-a#[]', extensions: []
+        should have_anchor href: 'doc-a.html', text: 'doc-a.html'
+      end
+    end
+  end
+
+  context 'document with invalid inter-document xref without reftext' do
+
+    context 'without fragment' do
+      it 'renders path of the non-existent document as reftext' do
+        given 'xref:missing#[]'
+        should have_anchor href: 'missing.html', text: 'missing.html'
+      end
+    end
+
+    context 'with non-existent fragment' do
+      it 'renders path of the referenced document as reftext' do
+        given 'xref:doc-a#missing[]'
+        should have_anchor href: 'doc-a.html#missing', text: 'doc-a.html'
+      end
+    end
+  end
+
+  context 'document with valid inter-document xref with reftext' do
+    it 'renders provided reftext' do
+      given 'xref:doc-a#[My Title]'
+      should have_anchor href: 'doc-a.html', text: 'My Title'
+    end
+  end
+
+  #----------  Helpers  ----------
+
+  def given(str, opts = {})
+    input.replace(str)
+    options.merge!(opts)
+  end
+
+  def have_anchor(href: nil, text: nil)
+    have_tag('a', with: { href: href }, text: text)
+  end
+end