| 1 | import XCTest |
| 2 | @testable import RastrilloNative |
| 3 | |
| 4 | @MainActor |
| 5 | final class CoalescedRunnerTests: XCTestCase { |
| 6 | func testSequentialCallsEachRefresh() async { |
| 7 | let runner = CoalescedRunner() |
| 8 | var passes = 0 |
| 9 | for _ in 0..<3 { await runner.run { passes += 1 } } |
| 10 | XCTAssertEqual(passes, 3) |
| 11 | } |
| 12 | |
| 13 | func testBurstWaitsForTrailingPassAndReusesOriginalOperation() async { |
| 14 | let runner = CoalescedRunner() |
| 15 | var passes = 0 |
| 16 | var release: CheckedContinuation<Void, Never>? |
| 17 | var trailingRelease: CheckedContinuation<Void, Never>? |
| 18 | let first = Task { @MainActor in |
| 19 | await runner.run { |
| 20 | passes += 1 |
| 21 | if passes == 1 { |
| 22 | await withCheckedContinuation { release = $0 } |
| 23 | } else { |
| 24 | await withCheckedContinuation { trailingRelease = $0 } |
| 25 | } |
| 26 | } |
| 27 | } |
| 28 | while release == nil { await Task.yield() } |
| 29 | var entered = 0 |
| 30 | var resumed = 0 |
| 31 | let waiters = (0..<5).map { _ in |
| 32 | Task { @MainActor in |
| 33 | entered += 1 |
| 34 | await runner.run { XCTFail("A burst must reuse the active operation") } |
| 35 | resumed += 1 |
| 36 | } |
| 37 | } |
| 38 | // Each task runs on this actor until run suspends, so observing all |
| 39 | // entries proves they have queued without timing-based sleeps. |
| 40 | while entered != 5 { await Task.yield() } |
| 41 | XCTAssertEqual(passes, 1) |
| 42 | XCTAssertEqual(resumed, 0) |
| 43 | release?.resume() |
| 44 | while trailingRelease == nil { await Task.yield() } |
| 45 | XCTAssertEqual(resumed, 0, "Callers must also wait for the trailing pass") |
| 46 | trailingRelease?.resume() |
| 47 | await first.value |
| 48 | for waiter in waiters { await waiter.value } |
| 49 | XCTAssertEqual(passes, 2) |
| 50 | XCTAssertEqual(resumed, 5) |
| 51 | await runner.run { passes += 1 } |
| 52 | XCTAssertEqual(passes, 3, "Completed work must not swallow the next refresh") |
| 53 | } |
| 54 | |
| 55 | func testCancelledWaiterDoesNotCancelSharedRefresh() async { |
| 56 | let runner = CoalescedRunner() |
| 57 | var release: CheckedContinuation<Void, Never>? |
| 58 | var passes = 0 |
| 59 | let first = Task { @MainActor in |
| 60 | await runner.run { |
| 61 | XCTAssertFalse(Task.isCancelled) |
| 62 | passes += 1 |
| 63 | if passes == 1 { await withCheckedContinuation { release = $0 } } |
| 64 | } |
| 65 | } |
| 66 | while release == nil { await Task.yield() } |
| 67 | var entered = false |
| 68 | let waiter = Task { @MainActor in |
| 69 | entered = true |
| 70 | await runner.run { XCTFail("Must not replace the active operation") } |
| 71 | } |
| 72 | while !entered { await Task.yield() } |
| 73 | waiter.cancel() |
| 74 | release?.resume() |
| 75 | await first.value |
| 76 | await waiter.value |
| 77 | XCTAssertEqual(passes, 2) |
| 78 | } |
| 79 | } |
| 80 | |
amadan