我可以模拟SKPhysicsContact对象以输入-(void)didEndContact:(SKPhysicsContact *)contact方法吗？还是在这里可以利用其他任何技术？
class PhysicsTestCase: XCTestCase {
var physics: GamePhysics!
...
func testCaseOfCollisionsHandling() {
let contact = SKPhysicsContact()
contact.bodyA = SKPhysicsBody(circleOfRadius: 10) // Error, 'bodyA' is get-only property
physics.didEnd(contact) // Physics conforms to `SKPhysicsContactDelegate`
}
...
}
...
// The class that is being tested
class GamePhysics: NSObject, SKPhysicsContactDelegate {
// MARK: - SKPhysicsContactDelegate
func didBegin(_ contact: SKPhysicsContact) {
guard let nodeA = contact.bodyA.node, let nodeB = contact.bodyB.node else {
fatalError("No nodes in colliding bodies")
}
switch (nodeB, nodeA) {
case let (ball as LogicalBall, tile as LogicalTile):
// Performing some logic
...
}
}
func didEnd(_ contact: SKPhysicsContact) {
...
}
...
}
最佳答案
虽然，乔恩·里德（Jon Reid）在https://stackoverflow.com/a/44101485/482853中提出的子类化非常简洁，但是由于SKPhysicsContact类本身的难以捉摸的特性，我未能使其在这种特殊情况下起作用。
解决此问题的方法是使用良好的旧Objective C运行时：
func testBallsCollisionIsPassedToHandler() {
let ballAMock = LogicalBallMock()
let bodyA = SKPhysicsBody(circleOfRadius: 10)
bodyA.perform(Selector(("setRepresentedObject:")), with: ballAMock) // So the bodyA.node will return ballAMock
let ballBMock = LogicalBallMock()
let bodyB = SKPhysicsBody(circleOfRadius: 10)
bodyB.perform(Selector(("setRepresentedObject:")), with: ballBMock) // So the bodyB.node will return ballBMock
let contact = SKPhysicsContact()
contact.perform(Selector(("setBodyA:")), with: bodyA)
contact.perform(Selector(("setBodyB:")), with: bodyB)
physics.didEnd(contact)
// Assertions ...
}
关于swift - 有没有一种方法可以编写一个对SKPhysicsContactDelegate函数的测试？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/44084187/