final class Cache<T>: CacheProtocol { func getValue(forKey key: String) -> T? { return storage[key] } func fetchValue(forKey key: String, completion: @escaping (T?) -> Void) { let value = storage[key] completion(value) } } final class CacheTests: XCTestCase { override func setUp() { super.setUp() } func testSetAndGetValue() { let cache = Cache<String>() let key: String = "key" let value: String = "value" cache.setValue(value, forKey: key) XCTAssertEqual(cache.getValue(forKey: key), value) cache.setValue(nil, forKey: key) XCTAssertTrue(cache.getValue(forKey: key) == nil) } func testCompletion() { } } CacheTests.defaultTestSuite.run()

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