Warnings--

Tests/StencilTests/Helpers.swift

@@ -0,0 +1,63 @@
+import PathKit
+import Spectre
+@testable import Stencil
+import XCTest
+
+extension Expectation {
+  @discardableResult
+  func toThrow<T: Error>() throws -> T {
+    var thrownError: Error?
+
+    do {
+      _ = try expression()
+    } catch {
+      thrownError = error
+    }
+
+    if let thrownError = thrownError {
+      if let thrownError = thrownError as? T {
+        return thrownError
+      } else {
+        throw failure("\(thrownError) is not \(T.self)")
+      }
+    } else {
+      throw failure("expression did not throw an error")
+    }
+  }
+}
+
+extension XCTestCase {
+  func expectedSyntaxError(token: String, template: Template, description: String) -> TemplateSyntaxError {
+    guard let range = template.templateString.range(of: token) else {
+      fatalError("Can't find '\(token)' in '\(template)'")
+    }
+    let lexer = Lexer(templateString: template.templateString)
+    let location = lexer.rangeLocation(range)
+    let sourceMap = SourceMap(filename: template.name, location: location)
+    let token = Token.block(value: token, at: sourceMap)
+    return TemplateSyntaxError(reason: description, token: token, stackTrace: [])
+  }
+}
+
+// MARK: - Test Types
+
+class ExampleLoader: Loader {
+  func loadTemplate(name: String, environment: Environment) throws -> Template {
+    if name == "example.html" {
+      return Template(templateString: "Hello World!", environment: environment, name: name)
+    }
+
+    throw TemplateDoesNotExist(templateNames: [name], loader: self)
+  }
+}
+
+class ErrorNode: NodeType {
+  let token: Token?
+  init(token: Token? = nil) {
+    self.token = token
+  }
+
+  func render(_ context: Context) throws -> String {
+    throw TemplateSyntaxError("Custom Error")
+  }
+}