Add tests for loading the view of ViewController

Author: tomaszpieczykolan

Tests/UICoreTests/ViewControllerTests.swift

@@ -5,4 +5,27 @@ import XCTest
 @testable import SwiftWin32
 
 final class ViewControllerTests: XCTestCase {
+  func testLazyViewLoading() {
+    let sut = ViewController()
+
+    XCTAssertNil(sut.viewIfLoaded)
+    XCTAssertFalse(sut.isViewLoaded)
+
+    _ = sut.view
+
+    XCTAssertNotNil(sut.viewIfLoaded)
+    XCTAssertTrue(sut.isViewLoaded)
+  }
+
+  func testManualViewLoading() {
+    let sut = ViewController()
+
+    XCTAssertNil(sut.viewIfLoaded)
+    XCTAssertFalse(sut.isViewLoaded)
+
+    sut.loadViewIfNeeded()
+
+    XCTAssertNotNil(sut.viewIfLoaded)
+    XCTAssertTrue(sut.isViewLoaded)
+  }
 }