Include template inheritence

Closes #15

StencilTests/TemplateLoader/InheritenceTests.swift

@@ -0,0 +1,51 @@
+import Foundation
+import XCTest
+import Stencil
+import PathKit
+
+class InheritenceTests: NodeTests {
+  var loader:TemplateLoader!
+
+  override func setUp() {
+    super.setUp()
+
+    let path = (Path(__FILE__) + Path("../..")).absolute()
+    loader = TemplateLoader(paths: [path])
+  }
+
+  func testInheritence() {
+    context = Context(dictionary: ["loader": loader])
+    let template = loader.loadTemplate("child.html")!
+    let result = template.render(context)
+
+    switch result {
+    case .Success(let rendered):
+      XCTAssertEqual(rendered, "Header\nChild")
+    case .Error(let error):
+      XCTAssert(false, "Unexpected error")
+    }
+  }
+}
+
+//class BlockNodeTests: NodeTests {
+//    func testBlockNodeWithoutChildren() {
+//        let context = Context()
+//        let block = BlockNode(name:"header", nodes:[TextNode(text: "contents")])
+//        let result = block.render(context)
+//
+//        assertSuccess(result) { rendered in
+//            XCTAssertEqual(rendered, "contents")
+//        }
+//    }
+//
+//    func testBlockNodeWithChild() {
+//        let context = Context()
+//        let node = BlockNode(name:"header", nodes:[TextNode(text: "contents")])
+//        let childBlock = BlockNode(name: "header", nodes: [TextNode(text: "child contents")])
+//        let result = node.render(context)
+//
+//        assertSuccess(result) { rendered in
+//            XCTAssertEqual(rendered, "child contents")
+//        }
+//    }
+//}

StencilTests/base.html

@@ -0,0 +1,2 @@
+{% block header %}Header{% endblock %}
+{% block body %}Body{% endblock %}

StencilTests/child.html

@@ -0,0 +1,2 @@
+{% extends "base.html" %}
+{% block body %}Child{% endblock %}