Add GitHub Actions workflow, assert in the test

Author: MaxDesiatov

.github/workflows/test.yml

@@ -0,0 +1,22 @@
+name: Build and test
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  macos_test:
+    runs-on: macos-11.0
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run the test suite on macOS
+        shell: bash
+        run: |
+          set -ex
+          sudo xcode-select --switch /Applications/Xcode_12.3.app/Contents/Developer/
+          
+          brew install swiftwasm/tap/carton
+
+          carton test --environment defaultBrowser

Tests/DOMKitTests/DOMKitTests.swift

@@ -1,15 +1,17 @@
 import XCTest
-import JavaScriptKit
-@testable import DOMKit
+import DOMKit
 
 final class DOMKitTests: XCTestCase {
     func testExample() {
-        let document = DOMKit.Document(from: JSObject.global.document)!
+        let document = global.document
         let button = document.createElement(localName: "button")
-        button.textContent = "Hello, world"
+        button.textContent = "Hello, world!"
         button.addEventListener(type: "click") { event in
             (event.target as? HTMLElement)?.textContent = "Clicked!"
         }
         _ = document.querySelector(selectors: "body")?.appendChild(node: button)
+
+        let queriedButton = document.querySelector(selectors: "body button")
+        XCTAssertEqual(button.textContent, "Hello, world!")
     }
 }