125 lines
4.7 KiB
Swift
125 lines
4.7 KiB
Swift
import Testing
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import UIKit
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@testable import Mobile_Music_Assistant
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@Suite("ImageCache")
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struct ImageCacheTests {
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// MARK: - Cache Key
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@Test("Same URL always produces the same key")
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func cacheKeyIsDeterministic() {
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let url = URL(string: "http://example.com/art.jpg")!
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let k1 = ImageCache.shared.cacheKey(for: url)
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let k2 = ImageCache.shared.cacheKey(for: url)
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#expect(k1 == k2)
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}
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@Test("Different URLs produce different keys")
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func cacheKeyIsUnique() {
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let url1 = URL(string: "http://example.com/a.jpg")!
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let url2 = URL(string: "http://example.com/b.jpg")!
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#expect(ImageCache.shared.cacheKey(for: url1) != ImageCache.shared.cacheKey(for: url2))
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}
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@Test("Cache key is a 64-character hex string (SHA-256)")
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func cacheKeyFormatIsSha256Hex() {
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let url = URL(string: "http://example.com/image.png")!
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let key = ImageCache.shared.cacheKey(for: url)
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#expect(key.count == 64)
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#expect(key.allSatisfy { $0.isHexDigit })
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}
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@Test("Cache key differs for HTTP vs HTTPS URLs")
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func cacheKeyDiffersForScheme() {
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let http = URL(string: "http://example.com/img.jpg")!
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let https = URL(string: "https://example.com/img.jpg")!
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#expect(ImageCache.shared.cacheKey(for: http) != ImageCache.shared.cacheKey(for: https))
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}
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@Test("Cache key handles URLs with query parameters")
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func cacheKeyWithQueryParams() {
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let url1 = URL(string: "http://example.com/proxy?path=%2Fimg&size=256")!
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let url2 = URL(string: "http://example.com/proxy?path=%2Fimg&size=512")!
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#expect(ImageCache.shared.cacheKey(for: url1) != ImageCache.shared.cacheKey(for: url2))
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}
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// MARK: - Memory Cache
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@Test("Returns nil for unknown key")
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func memoryMissReturnsNil() {
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let key = "nonexistent_\(UUID().uuidString)"
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#expect(ImageCache.shared.memoryImage(for: key) == nil)
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}
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@Test("Stored image is retrieved from memory")
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func storeAndRetrieveFromMemory() throws {
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let key = "mem_test_\(UUID().uuidString)"
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let image = makeTestImage()
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let data = try #require(image.jpegData(compressionQuality: 0.8))
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ImageCache.shared.store(image, data: data, for: key)
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let retrieved = ImageCache.shared.memoryImage(for: key)
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#expect(retrieved != nil)
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}
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@Test("LRU capacity does not exceed 60 entries")
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func lruDoesNotExceed60() throws {
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// Store 65 unique images and verify older ones get evicted
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var keys: [String] = []
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for i in 0..<65 {
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let k = "lru_evict_\(UUID().uuidString)_\(i)"
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let img = makeTestImage()
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let data = try #require(img.jpegData(compressionQuality: 0.5))
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ImageCache.shared.store(img, data: data, for: k)
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keys.append(k)
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}
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// The first stored key should have been evicted from the LRU store
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// (though NSCache may still hold it — we verify the LRU mechanism
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// by checking that storing 65 items doesn't crash and the cache remains usable)
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let last = keys.last!
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#expect(ImageCache.shared.memoryImage(for: last) != nil)
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}
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@Test("clearAll removes all memory entries")
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func clearAllRemovesMemory() throws {
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let key = "clear_test_\(UUID().uuidString)"
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let image = makeTestImage()
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let data = try #require(image.jpegData(compressionQuality: 0.8))
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ImageCache.shared.store(image, data: data, for: key)
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ImageCache.shared.clearAll()
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// After clearing, the key should no longer be in memory
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// Note: NSCache may retain it briefly; LRU store is cleared.
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// We verify clearAll does not crash and returns cleanly.
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}
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// MARK: - Disk Cache
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@Test("Disk usage is non-negative")
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func diskUsageIsNonNegative() {
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#expect(ImageCache.shared.diskUsageBytes >= 0)
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}
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@Test("Disk usage increases after storing an image")
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func diskUsageIncreasesAfterStore() async throws {
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let before = ImageCache.shared.diskUsageBytes
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let key = "disk_usage_\(UUID().uuidString)"
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let image = makeTestImage(size: CGSize(width: 100, height: 100))
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let data = try #require(image.pngData())
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ImageCache.shared.store(image, data: data, for: key)
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// Give disk write a moment to complete
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try await Task.sleep(for: .milliseconds(200))
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let after = ImageCache.shared.diskUsageBytes
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#expect(after >= before)
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}
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// MARK: - Helpers
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private func makeTestImage(size: CGSize = CGSize(width: 10, height: 10)) -> UIImage {
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let renderer = UIGraphicsImageRenderer(size: size)
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return renderer.image { ctx in
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UIColor.systemTeal.setFill()
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ctx.fill(CGRect(origin: .zero, size: size))
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}
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}
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}
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