CSS evaluator specs for :nth-last-child

spec/oga/css/evaluator/pseudo_classes/nth_last_child_spec.rb

@@ -0,0 +1,49 @@
+require 'spec_helper'
+
+describe 'CSS selector evaluation' do
+  context ':nth-last-child pseudo class' do
+    before do
+      @document = parse('<root><a1 /><a2 /><a3 /><a4 /></root>')
+
+      @root = @document.children[0]
+      @a1   = @root.children[0]
+      @a2   = @root.children[1]
+      @a3   = @root.children[2]
+      @a4   = @root.children[3]
+    end
+
+    example 'return a node set containing the last child node' do
+      evaluate_css(@document, 'root :nth-last-child(1)').should == node_set(@a4)
+    end
+
+    example 'return a node set containing even nodes' do
+      evaluate_css(@document, 'root :nth-last-child(even)')
+        .should == node_set(@a1, @a3)
+    end
+
+    example 'return a node set containing odd nodes' do
+      evaluate_css(@document, 'root :nth-last-child(odd)')
+        .should == node_set(@a2, @a4)
+    end
+
+    example 'return a node set containing every 2 nodes starting at node 3' do
+      evaluate_css(@document, 'root :nth-last-child(2n+2)')
+        .should == node_set(@a1, @a3)
+    end
+
+    example 'return a node set containing all nodes' do
+      evaluate_css(@document, 'root :nth-last-child(n)')
+        .should == @root.children
+    end
+
+    example 'return a node set containing the first two nodes' do
+      evaluate_css(@document, 'root :nth-last-child(-n+2)')
+        .should == node_set(@a3, @a4)
+    end
+
+    example 'return a node set containing all nodes starting at node 2' do
+      evaluate_css(@document, 'root :nth-last-child(n+2)')
+        .should == node_set(@a1, @a2, @a3)
+    end
+  end
+end