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// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
class TestNSCache : XCTestCase {
func test_setWithUnmutableKeys() {
let cache = NSCache<NSString, NSString>()
var key1 = NSString(string: "key")
var key2 = NSString(string: "key")
var value = NSString(string: "value")
cache.setObject(value, forKey: key1)
XCTAssertEqual(cache.object(forKey: key1), value, "should be equal to \(value) when using first key")
XCTAssertEqual(cache.object(forKey: key2), value, "should be equal to \(value) when using second key")
value = NSString(string: "value1")
cache.setObject(value, forKey: key2)
XCTAssertEqual(cache.object(forKey: key1), value, "should be equal to \(value) when using first key")
XCTAssertEqual(cache.object(forKey: key2), value, "should be equal to \(value) when using second key")
key1 = "kkey"
key2 = "kkey"
let value1 = NSString(string: "value1")
let value2 = NSString(string: "value1")
cache.setObject(value1, forKey: key1)
XCTAssertEqual(cache.object(forKey: key1), value1, "should be equal to \(value1) when using first key")
XCTAssertEqual(cache.object(forKey: key2), value1, "should be equal to \(value1) when using second key")
XCTAssertEqual(cache.object(forKey: key1), value2, "should be equal to \(value1) when using first key")
XCTAssertEqual(cache.object(forKey: key2), value2, "should be equal to \(value1) when using second key")
}
func test_setWithMutableKeys() {
let cache = NSCache<NSMutableString, NSString>()
let key1 = NSMutableString(string: "key")
let key2 = NSMutableString(string: "key")
let value = NSString(string: "value")
cache.setObject(value, forKey: key1)
XCTAssertEqual(cache.object(forKey: key1), value, "should be equal to \(value) when using first key")
XCTAssertEqual(cache.object(forKey: key2), value, "should be equal to \(value) when using second key")
key1.append("1")
// Mutating the key probably changes the hash value, which often makes
// the value inaccessible by sorting the key into a different bucket.
// On the other hand, the bucket may remain the same by coincidence.
// Therefore, `cache.object(forKey: key1)` may or may not be nil at
// this point -- no useful check can be made.
// The object can definitely not be reached via the original key,
// though.
XCTAssertNil(cache.object(forKey: key2), "should be nil")
// Restoring key1 to the original string will make the value
// accessible again.
key1.setString("key")
XCTAssertEqual(cache.object(forKey: key1), value, "should be equal to \(value) when using first key")
XCTAssertEqual(cache.object(forKey: key2), value, "should be equal to \(value) when using second key")
}
func test_costLimit() {
let cache = NSCache<NSString, NSString>()
cache.totalCostLimit = 10
cache.setObject("object0", forKey: "0", cost: 4)
cache.setObject("object2", forKey: "2", cost: 5)
cache.setObject("object1", forKey: "1", cost: 5)
XCTAssertNil(cache.object(forKey: "0"), "should be nil")
XCTAssertEqual(cache.object(forKey: "2"), "object2", "should be equal to 'object2'")
XCTAssertEqual(cache.object(forKey: "1"), "object1", "should be equal to 'object1'")
}
func test_countLimit() {
let cache = NSCache<NSString, NSString>()
cache.countLimit = 2
let key1 = NSString(string: "key1")
let key2 = NSString(string: "key2")
let key3 = NSString(string: "key3")
let value = NSString(string: "value")
cache.setObject(value, forKey: key1, cost: 1)
cache.setObject(value, forKey: key2, cost: 2)
cache.setObject(value, forKey: key3, cost: 3)
XCTAssertEqual(cache.object(forKey: key2), value, "should be equal to \(value)")
XCTAssertEqual(cache.object(forKey: key3), value, "should be equal to \(value)")
XCTAssertNil(cache.object(forKey: key1), "should be nil")
}
class TestHashableCacheKey: Hashable {
let string: String
init(string: String) {
self.string = string
}
func hash(into hasher: inout Hasher) {
hasher.combine(string)
}
static func ==(lhs: TestHashableCacheKey,
rhs:TestHashableCacheKey) -> Bool {
return lhs.string == rhs.string
}
}
// Test when NSCacheKey.value is AnyHashable
func test_hashableKey() {
let cache = NSCache<TestHashableCacheKey, NSString>()
cache.countLimit = 2
let key1 = TestHashableCacheKey(string: "key1")
let key2 = TestHashableCacheKey(string: "key2")
let key3 = TestHashableCacheKey(string: "key3")
let value = NSString(string: "value")
cache.setObject(value, forKey: key1, cost: 1)
cache.setObject(value, forKey: key2, cost: 2)
cache.setObject(value, forKey: key3, cost: 3)
XCTAssertEqual(cache.object(forKey: key2), value, "should be equal to \(value)")
XCTAssertEqual(cache.object(forKey: key3), value, "should be equal to \(value)")
XCTAssertNil(cache.object(forKey: key1), "should be nil")
}
class TestCacheKey {
let string: String
init(string: String) {
self.string = string
}
}
// Test when NSCacheKey.value is neither NSObject or AnyHashable
func test_nonHashableKey() {
let cache = NSCache<TestCacheKey, NSString>()
cache.countLimit = 2
let key1 = TestCacheKey(string: "key1")
let key2 = TestCacheKey(string: "key2")
let key3 = TestCacheKey(string: "key3")
let value = NSString(string: "value")
cache.setObject(value, forKey: key1, cost: 1)
cache.setObject(value, forKey: key2, cost: 2)
cache.setObject(value, forKey: key3, cost: 3)
XCTAssertEqual(cache.object(forKey: key2), value, "should be equal to \(value)")
XCTAssertEqual(cache.object(forKey: key3), value, "should be equal to \(value)")
XCTAssertNil(cache.object(forKey: key1), "should be nil")
}
func test_objectCorrectlyReleased() {
let cache = NSCache<NSString, AnyObject>()
cache.totalCostLimit = 10
var object1 = NSObject()
weak var weakObject1: NSObject? = object1
var object2 = NSObject()
weak var weakObject2: NSObject? = object2
var object3 = NSObject()
weak var weakObject3: NSObject? = object3
let object4 = NSObject()
let object5 = NSObject()
cache.setObject(object1, forKey: "key1", cost: 1)
cache.setObject(object2, forKey: "key2", cost: 2)
cache.setObject(object3, forKey: "key3", cost: 3)
cache.setObject(object4, forKey: "key4", cost: 4)
cache.setObject(object5, forKey: "key5", cost: 5)
object1 = NSObject()
object2 = NSObject()
object3 = NSObject()
XCTAssertNil(weakObject1, "removed cached object not released")
XCTAssertNil(weakObject2, "removed cached object not released")
XCTAssertNil(weakObject3, "removed cached object not released")
}
}
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