Unit tests for import tag

Tests/StencilSwiftKitTests/ImportNodeTests.swift

@@ -0,0 +1,55 @@
+//
+// StencilSwiftKit UnitTests
+// Copyright © 2022 SwiftGen
+// MIT Licence
+//
+
+@testable import Stencil
+@testable import StencilSwiftKit
+import XCTest
+
+final class ImportNodeTests: XCTestCase {
+  func testParser() {
+    let tokens: [Token] = [.block(value: "import \"Common.stencil\"", at: .unknown)]
+
+    let parser = TokenParser(tokens: tokens, environment: stencilSwiftEnvironment())
+    guard let nodes = try? parser.parse(),
+      let node = nodes.first as? ImportNode else {
+      XCTFail("Unable to parse tokens")
+      return
+    }
+
+    XCTAssertEqual(node.templateName, Variable("\"Common.stencil\""))
+  }
+
+  func testParserFail() {
+    do {
+      let tokens: [Token] = [.block(value: "import", at: .unknown)]
+
+      let parser = TokenParser(tokens: tokens, environment: stencilSwiftEnvironment())
+      XCTAssertThrowsError(try parser.parse())
+    }
+  }
+
+  func testRenderIsEmpty() throws {
+    let node = ImportNode(templateName: Variable("\"Common.stencil\""))
+    let env = stencilSwiftEnvironment(templates: ["Common.stencil": "Hello world!"])
+    let context = Context(dictionary: ["": ""], environment: env)
+    let output = try node.render(context)
+
+    XCTAssertEqual(output, "")
+  }
+
+  func testContextModification() throws {
+    let node = ImportNode(templateName: Variable("\"Common.stencil\""))
+    let env = stencilSwiftEnvironment(templates: ["Common.stencil": "{% set x %}hello{% endset %}"])
+    let context = Context(dictionary: ["": ""], environment: env)
+    _ = try node.render(context)
+
+    guard let string = context["x"] as? String else {
+      XCTFail("Unable to render import token")
+      return
+    }
+    XCTAssertEqual(string, "hello")
+  }
+}