diff --git a/spec/oga/css/evaluator/classes_spec.rb b/spec/oga/css/evaluator/classes_spec.rb
new file mode 100644
index 0000000..b16b6cd
--- /dev/null
+++ b/spec/oga/css/evaluator/classes_spec.rb
@@ -0,0 +1,29 @@
+require 'spec_helper'
+
+describe 'CSS selector evaluation' do
+  context 'classes' do
+    example 'return a node set containing a node with a single class' do
+      document = parse('<x class="foo" />')
+
+      evaluate_css(document, '.foo').should == document.children
+    end
+
+    example 'return a node set containing a node having one of two classes' do
+      document = parse('<x class="foo bar" />')
+
+      evaluate_css(document, '.foo').should == document.children
+    end
+
+    example 'return a node set containing a node having both classes' do
+      document = parse('<x class="foo bar" />')
+
+      evaluate_css(document, '.foo.bar').should == document.children
+    end
+
+    example 'return an empty node set for non matching classes' do
+      document = parse('<x class="bar" />')
+
+      evaluate_css(document, '.foo').should == node_set
+    end
+  end
+end