Add tests for viewDidLoad

Author: tomaszpieczykolan

Tests/UICoreTests/ViewControllerTests.swift

@@ -66,6 +66,47 @@ final class ViewControllerTests: XCTestCase {
 
 XCTAssert(sut.next === expectedResult)
 }
+
+func testViewDidLoadMethodCalledAfterLazyViewLoad() {
+let sut = MockViewController()
+
+let expectation = self.expectation(description: "viewDidLoad should be called")
+
+sut.viewDidLoadBlock = {
+expectation.fulfill()
+}
+
+_ = sut.view
+
+wait(for: [expectation], timeout: 0.1)
+}
+
+func testViewDidLoadMethodCalledAfterManualViewLoad() {
+let sut = MockViewController()
+
+let expectation = self.expectation(description: "viewDidLoad should be called")
+
+sut.viewDidLoadBlock = {
+expectation.fulfill()
+}
+
+sut.loadViewIfNeeded()
+
+wait(for: [expectation], timeout: 0.1)
+}
+
+func testViewDidLoadMethodNotCalledIfViewNotLoaded() {
+let sut = MockViewController()
+
+let expectation = self.expectation(description: "viewDidLoad should not be called")
+expectation.isInverted = true
+
+sut.viewDidLoadBlock = {
+expectation.fulfill()
+}
+
+wait(for: [expectation], timeout: 0.1)
+}
 }
 
 final class MockViewController: ViewController {