swiftpm-stencil/Tests/StencilTests/NodeSpec.swift

import XCTest
import Spectre
@testable import Stencil

class ErrorNode : NodeType {
  let token: Token?
  init(token: Token? = nil) {
    self.token = token
  }

  func render(_ context: Context) throws -> String {
    throw TemplateSyntaxError("Custom Error")
  }
}

class NodeTests: XCTestCase {
  func testNode() {
    describe("Node") {
      let context = Context(dictionary: [
        "name": "Kyle",
        "age": 27,
        "items": [1, 2, 3],
        ])

      $0.describe("TextNode") {
        $0.it("renders the given text") {
          let node = TextNode(text: "Hello World")
          try expect(try node.render(context)) == "Hello World"
        }
      }

      $0.describe("VariableNode") {
        $0.it("resolves and renders the variable") {
          let node = VariableNode(variable: Variable("name"))
          try expect(try node.render(context)) == "Kyle"
        }

        $0.it("resolves and renders a non string variable") {
          let node = VariableNode(variable: Variable("age"))
          try expect(try node.render(context)) == "27"
        }
      }

      $0.describe("rendering nodes") {
        $0.it("renders the nodes") {
          let nodes: [NodeType] = [
            TextNode(text:"Hello "),
            VariableNode(variable: "name"),
            ]

          try expect(try renderNodes(nodes, context)) == "Hello Kyle"
        }

        $0.it("correctly throws a nodes failure") {
          let nodes: [NodeType] = [
            TextNode(text:"Hello "),
            VariableNode(variable: "name"),
            ErrorNode(),
            ]

          try expect(try renderNodes(nodes, context)).toThrow(TemplateSyntaxError("Custom Error"))
        }
      }
    }
  }
}