Extra tests for parsing XPath function calls.

spec/oga/xpath/parser/calls_spec.rb

@@ -24,5 +24,61 @@ describe Oga::XPath::Parser do
         )
       )
     end
+
+    example 'parse a relative path with a function call' do
+      parse_xpath('foo/bar()').should == s(
+        :path,
+        s(:test, nil, 'foo'),
+        s(:path, s(:call, 'bar'))
+      )
+    end
+
+    example 'parse an absolute path with a function call' do
+      parse_xpath('/foo/bar()').should == s(
+        :absolute,
+        s(:path, s(:test, nil, 'foo'), s(:path, s(:call, 'bar')))
+      )
+    end
+
+    example 'parse a predicate followed by a function call' do
+      parse_xpath('div[@class="foo"]/bar()').should == s(
+        :path,
+        s(
+          :test,
+          nil,
+          'div',
+          s(
+            :path,
+            s(
+              :eq,
+              s(:axis, 'attribute', s(:test, nil, 'class')),
+              s(:string, 'foo')
+            )
+          )
+        ),
+        s(:path, s(:call, 'bar'))
+      )
+    end
+
+    example 'parse two predicates followed by a function call' do
+      parse_xpath('A[@class]/B[@class]/bar()').should == s(
+        :path,
+        s(
+          :test,
+          nil,
+          'A',
+          s(:path, s(:axis, 'attribute', s(:test, nil, 'class')))),
+        s(
+          :path,
+          s(
+            :test,
+            nil,
+            'B',
+            s(:path, s(:axis, 'attribute', s(:test, nil, 'class')))
+          ),
+          s(:path, s(:call, 'bar'))
+        )
+      )
+    end
   end
 end