Fix examples tests failing upon retry (#2177)

Tests/ExamplesTests/TestableExampleTests.swift

@@ -4,28 +4,24 @@ import ObjectiveC.runtime
 import MapboxMaps
 
 final class TestableExampleTests: XCTestCase {
- private var example: Example?
  private weak var weakExampleViewController: UIViewController?
  private weak var weakMapView: MapView?
  private var exampleControllerRemovedExpectation: XCTestExpectation?
 
  override static var defaultTestSuite: XCTestSuite {
  let newTestSuite = XCTestSuite(forTestCaseClass: TestableExampleTests.self)
 
- guard let method = class_getInstanceMethod(Self.self, #selector(runExample)) else {
- fatalError("Cannot find method 'runExample'")
- }
-
- let existingImpl = method_getImplementation(method)
-
  for example in Examples.all.flatMap(\.examples) {
  // Add a method for this test, but using the same implementation
- let selectorName = "test\(example.type)"
- let testSelector = Selector((selectorName))
- class_addMethod(Self.self, testSelector, existingImpl, "v@:f")
+ let testSelector = Selector("test\(example.type)")
+ let myBlock: @convention(block) (TestableExampleTests) -> Void = { testCase in
+ testCase.runExample(example)
+ }
+
+ let closureImpl = imp_implementationWithBlock(myBlock)
+ class_addMethod(Self.self, testSelector, closureImpl, "v@:")
 
  let test = TestableExampleTests(selector: testSelector)
- test.example = example
  print("Adding test for \(example)")
  newTestSuite.addTest(test)
  }
@@ -42,17 +38,12 @@ final class TestableExampleTests: XCTestCase {
  XCTAssertNil(weakMapView, "Example mapView is part of a memory leak")
  }
 
- @objc private func runExample() {
+ private func runExample(_ example: Example) {
  guard let navigationController = UIApplication.shared.windows.first?.rootViewController as? UINavigationController else {
  XCTFail("Root controller is not a UINavigationController")
  return
  }
 
- // example can be nil, when the test is repeated, because test runner uses default `init(selector:)` and cannot set example property to the test
- guard let example else {
- return XCTFail("Currently selected example is nil")
- }
-
  navigationController.delegate = self
 
  let exampleViewController = example.makeViewController()