weakTestScoped.swift

func testListenerIsKeeptWithWeakReference() {
    // Arrange
    let sut = MasterClass()
    weak var weakListener: MasterClassListener?
    do {
        let listener = MasterListener()
        weakListener = listener
    // Act
        sut.add(listener)
    }
    // Assert
    XCTAssertNil(weakListener)
}