Retrofit deferFulfillment onto snapshot tests. (#3641)

* Retrofit `deferFulfillment` onto snapshot tests. * Convert a bunch of preview tests to the new fulfillment publisher * Convert more tests * Remove unneeded delays from the remaining tests * Remove snapshotting delay option.
2026-11-02 21:33:26 +00:00 · 2024-12-20 15:30:59 +02:00
parent 365797c8b7
commit 536f01abbd
49 changed files with 606 additions and 532 deletions
@@ -5,6 +5,7 @@
 // Please see LICENSE in the repository root for full details.
 //

+import Combine
 import SwiftUI
 import XCTest

@@ -50,21 +51,21 @@ class PreviewTests: XCTestCase {
    
    // MARK: - Snapshots

-    func assertSnapshots(matching preview: _Preview, testName: String = #function) {
+    func assertSnapshots(matching preview: _Preview, testName: String = #function) async throws {
        let preferences = SnapshotPreferences()
-
+        
        let preferenceReadingView = preview.content
-            .onPreferenceChange(SnapshotDelayPreferenceKey.self) { preferences.delay = $0 }
            .onPreferenceChange(SnapshotPrecisionPreferenceKey.self) { preferences.precision = $0 }
            .onPreferenceChange(SnapshotPerceptualPrecisionPreferenceKey.self) { preferences.perceptualPrecision = $0 }
+            .onPreferenceChange(SnapshotFulfillmentPublisherPreferenceKey.self) { preferences.fulfillmentPublisher = $0?.publisher }
        
        // Render an image of the view in order to trigger the preference updates to occur.
        let imageRenderer = ImageRenderer(content: preferenceReadingView)
        _ = imageRenderer.uiImage
        
-        // Delay the test now - a delay after creating the `snapshotView` results in the underlying view not getting updated for snapshotting.
-        if preferences.delay != .zero {
-            wait(for: preferences.delay)
+        if let fulfillmentPublisher = preferences.fulfillmentPublisher {
+            let deferred = deferFulfillment(fulfillmentPublisher) { $0 == true }
+            try await deferred.fulfill()
        }
        
        for deviceName in snapshotDevices {
@@ -133,10 +134,10 @@ class PreviewTests: XCTestCase {
    }
 }

-private class SnapshotPreferences {
-    var delay: TimeInterval = 0
+private class SnapshotPreferences: @unchecked Sendable {
    var precision: Float = 1
    var perceptualPrecision: Float = 1
+    var fulfillmentPublisher: AnyPublisher<Bool, Never>?
 }

 // MARK: - SnapshotTesting + Extensions
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