Basic specs for the "ancestor" axis.

spec/oga/xpath/evaluator/axes_spec.rb

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+require 'spec_helper'
+
+describe Oga::XPath::Evaluator do
+  before do
+    @document = parse('<a><b><c></c></b><d></d></a>')
+  end
+
+  context 'ancestor axis' do
+    before do
+      c_node     = @document.children[0].children[0].children[0]
+      @evaluator = described_class.new(c_node)
+    end
+
+    context 'direct ancestors' do
+      before do
+        @set = @evaluator.evaluate('ancestor::b')
+      end
+
+      example 'return a NodeSet instance' do
+        @set.is_a?(Oga::XML::NodeSet).should == true
+      end
+
+      example 'return the right amount of rows' do
+        @set.length.should == 1
+      end
+
+      example 'return the <b> ancestor' do
+        @set[0].name.should == 'b'
+      end
+    end
+
+    context 'higher ancestors' do
+      before do
+        @set = @evaluator.evaluate('ancestor::a')
+      end
+
+      example 'return a NodeSet instance' do
+        @set.is_a?(Oga::XML::NodeSet).should == true
+      end
+
+      example 'return the right amount of rows' do
+        @set.length.should == 1
+      end
+
+      example 'return the <b> ancestor' do
+        @set[0].name.should == 'a'
+      end
+    end
+  end
+end