From 5cd4166025f84b822841bbc5c30bccd27f4a777f Mon Sep 17 00:00:00 2001
From: Paul Zabelin <paulz@users.noreply.github.com>
Date: Sun, 5 Jun 2022 17:34:00 -0700
Subject: [PATCH] Experiment/scale 1 (#17)

* use transparent background for diff
* add premultiply alpha before comparing
* premultiply alpha for diff, clear background for host
* use transparent background
* test compare of same data should have 0 difference
* use hierarchy and sRGB
* use scale 1.0
* allow appearance transition when adding and removing child controller
* move settingAlphaOne to package
* use extended range and P3 gamut
* set flatness, test no rendering in unit tests
* fix: unbalance calls to appearance for delaying for 0.01s
* use standard range to fix image comparison for sample view
* fix: favorite view renders with 5% accuracy on GitHub runner
---
 .github/workflows/build-and-test.yml          |  10 ++
 .../SwiftUI-snapshot-testing.xcscheme         | 105 ++++++++++++++++++
 Example/ApplicationTests/SnapshotTests.swift  |   7 +-
 .../Snapshots/ContentView.png                 | Bin 6068 -> 2025 bytes
 .../Snapshots/FavoriteView.png                | Bin 4885 -> 3138 bytes
 .../ApplicationTests/Snapshots/example.png    | Bin 3177 -> 1832 bytes
 Sources/Private/UIViewExtensions.swift        |  66 +++++++++--
 Sources/Private/maxColorDiff.swift            |  33 +++++-
 Sources/verifySnapshot.swift                  |  37 +++---
 Tests/CompareTest.swift                       |  12 ++
 Tests/SampleViewTest.swift                    |  26 ++++-
 Tests/Snapshots/SampleView-blank.png          | Bin 0 -> 772 bytes
 Tests/Snapshots/SampleView.png                | Bin 737 -> 296 bytes
 Tests/Snapshots/UIKit-sample-view.png         | Bin 2288 -> 1210 bytes
 Tests/UIKitViewTest.swift                     |  10 +-
 15 files changed, 261 insertions(+), 45 deletions(-)
 create mode 100644 .swiftpm/xcode/xcshareddata/xcschemes/SwiftUI-snapshot-testing.xcscheme
 create mode 100644 Tests/CompareTest.swift
 create mode 100644 Tests/Snapshots/SampleView-blank.png

diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 36e4b29..5f0de6e 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -45,4 +45,14 @@ jobs:
         project: Example/Example.xcodeproj
         scheme: Example
         destination: ${{ env.destination }}
+        result-bundle-path: test-results/example-tests
         action: test
+    - name: Archive results # due to: https://github.com/actions/upload-artifact/issues/243
+      if: always()
+      run: zip -FSry results.zip test-results || true
+    - name: Upload test results
+      if: always()
+      uses: actions/upload-artifact@v3
+      with:
+        name: test-results
+        path: results.zip
diff --git a/.swiftpm/xcode/xcshareddata/xcschemes/SwiftUI-snapshot-testing.xcscheme b/.swiftpm/xcode/xcshareddata/xcschemes/SwiftUI-snapshot-testing.xcscheme
new file mode 100644
index 0000000..d889863
--- /dev/null
+++ b/.swiftpm/xcode/xcshareddata/xcschemes/SwiftUI-snapshot-testing.xcscheme
@@ -0,0 +1,105 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1340"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "SwiftUI_SnapshotTesting"
+               BuildableName = "SwiftUI_SnapshotTesting"
+               BlueprintName = "SwiftUI_SnapshotTesting"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "NO"
+            buildForArchiving = "NO"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "UnitTests"
+               BuildableName = "UnitTests"
+               BlueprintName = "UnitTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "ViewSnapshotTesting"
+               BuildableName = "ViewSnapshotTesting"
+               BlueprintName = "ViewSnapshotTesting"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "UnitTests"
+               BuildableName = "UnitTests"
+               BlueprintName = "UnitTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "SwiftUI_SnapshotTesting"
+            BuildableName = "SwiftUI_SnapshotTesting"
+            BlueprintName = "SwiftUI_SnapshotTesting"
+            ReferencedContainer = "container:">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/Example/ApplicationTests/SnapshotTests.swift b/Example/ApplicationTests/SnapshotTests.swift
index ac254b2..44c7a55 100644
--- a/Example/ApplicationTests/SnapshotTests.swift
+++ b/Example/ApplicationTests/SnapshotTests.swift
@@ -3,10 +3,11 @@ import XCTest
 import SwiftUI_snapshot_test
 import SwiftUI
 
+
 class SnapshotTests: XCTestCase {
     func testViews() throws {
-        verifySnapshot(FavoriteView_Previews.self)
-        verifySnapshot(ContentView())
-        verifySnapshot(Text("SwiftUI").foregroundColor(.red), "example")
+        verifySnapshot(FavoriteView_Previews.self, colorAccuracy: 0.05)
+        verifySnapshot(ContentView(), colorAccuracy: 0)
+        verifySnapshot(Text("SwiftUI").foregroundColor(.red), "example", colorAccuracy: 0)
     }
 }
diff --git a/Example/ApplicationTests/Snapshots/ContentView.png b/Example/ApplicationTests/Snapshots/ContentView.png
index ff68d4e916f423cdbee8b1a1de6ca0a40b015121..980914498f37a06b8c79bc4b5a99ef8f82394fe7 100644
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diff --git a/Sources/Private/UIViewExtensions.swift b/Sources/Private/UIViewExtensions.swift
index bf0829a..a571969 100644
--- a/Sources/Private/UIViewExtensions.swift
+++ b/Sources/Private/UIViewExtensions.swift
@@ -1,25 +1,67 @@
 import UIKit
+import XCTest
 
-extension UIView {
-    func renderFormat() -> UIGraphicsImageRendererFormat {
-        let format = UIGraphicsImageRendererFormat(for: .current)
-        format.opaque = true
+extension UITraitCollection {
+    static let snapshots = UITraitCollection(traitsFrom: [
+        UITraitCollection(displayGamut: .P3),
+        UITraitCollection(displayScale: 1.0),
+        UITraitCollection(activeAppearance: .active),
+        UITraitCollection(userInterfaceLevel: .base),
+        UITraitCollection(legibilityWeight: .regular),
+        UITraitCollection(userInterfaceStyle: .light),
+        UITraitCollection(preferredContentSizeCategory: .medium),
+    ])
+}
+
+extension UIGraphicsImageRendererFormat {
+    static let snapshots: UIGraphicsImageRendererFormat = {
+        let format = UIGraphicsImageRendererFormat(for: .snapshots)
+        format.opaque = false
         format.preferredRange = .standard
         return format
-    }
+    }()
+}
+
+extension UIView {
     func renderer() -> UIGraphicsImageRenderer {
-        UIGraphicsImageRenderer(bounds: bounds, format: renderFormat())
+        UIGraphicsImageRenderer(bounds: bounds, format: .snapshots)
     }
     
     func renderLayerAsBitmap() -> UIImage {
-        renderer().image {
-            layer.render(in: $0.cgContext)
-        }
+        renderer().image(actions: renderLayerActions(_:))
+    }
+    
+    func renderLayerAsPNG() -> Data {
+        renderer().pngData(actions: renderLayerActions(_:))
+    }
+    
+    func renderLayerActions(_ context: UIGraphicsImageRendererContext) {
+        configureContext(context)
+        layer.render(in: context.cgContext)
+    }
+    
+    func configureContext(_ context: UIGraphicsImageRendererContext) {
+        context.cgContext.setFlatness(0.01)
+        context.cgContext.setShouldAntialias(false)
+        context.cgContext.setAllowsAntialiasing(false)
+        context.cgContext.setAllowsFontSubpixelPositioning(false)
+        context.cgContext.setShouldSubpixelPositionFonts(false)
+        context.cgContext.setShouldSmoothFonts(false)
+        context.cgContext.setAllowsFontSubpixelQuantization(false)
+        context.cgContext.setShouldSubpixelQuantizeFonts(false)
+    }
+
+    func renderHierarchyAsPNG() -> Data {
+        renderer().pngData(actions: drawHierarchyActions(_:))
+    }
+    
+    func drawHierarchyActions(_ context: UIGraphicsImageRendererContext) {
+        configureContext(context)
+        XCTAssertTrue(drawHierarchy(in: bounds, afterScreenUpdates: true),
+                      "unable to take snapshot of the view")
     }
     
     func renderHierarchyOnScreen() -> UIImage {
-        renderer().image { _ in
-            drawHierarchy(in: bounds, afterScreenUpdates: true)
-        }
+        renderer().image(actions: drawHierarchyActions(_:))
     }
 }
diff --git a/Sources/Private/maxColorDiff.swift b/Sources/Private/maxColorDiff.swift
index ca6b2e9..9dcf32c 100644
--- a/Sources/Private/maxColorDiff.swift
+++ b/Sources/Private/maxColorDiff.swift
@@ -2,6 +2,12 @@ import UIKit
 import CoreImage
 import CoreImage.CIFilterBuiltins
 
+extension CIImage {
+    func settingAlphaOne() -> CIImage {
+        settingAlphaOne(in: extent)
+    }
+}
+
 func diff(_ old: UIImage, _ new: UIImage) -> UIImage {
     let differenceFilter = diff(
         old.cgImage!,
@@ -21,15 +27,15 @@ func diff(_ old: CGImage, _ new: CGImage) -> CICompositeOperation {
 
 func diff(_ old: CIImage, _ new: CIImage) -> CICompositeOperation {
     let differenceFilter: CICompositeOperation = CIFilter.differenceBlendMode()
-    differenceFilter.inputImage = old
-    differenceFilter.backgroundImage = new
+    differenceFilter.inputImage = old.settingAlphaOne()
+    differenceFilter.backgroundImage = new.settingAlphaOne()
     return differenceFilter
 }
 
 func histogramData(_ ciImage: CIImage) -> Data {
     let hist = CIFilter.areaHistogram()
     hist.inputImage = ciImage
-    hist.setValue(CIVector(cgRect: ciImage.extent), forKey: kCIInputExtentKey)
+    hist.extent = ciImage.extent
     return hist.value(forKey: "outputData") as! Data
 }
 
@@ -55,8 +61,25 @@ func histogram(ciImage: CIImage) -> [UInt32] {
 }
 
 func compare(_ left: UIImage, _ right: UIImage) -> ImageComparisonResult {
-    let image1 = CIImage(image: left)!
-    let image2 = CIImage(image: right)!
+    let image1 = CIImage(image: left)!.premultiplyingAlpha()
+    let image2 = CIImage(image: right)!.premultiplyingAlpha()
+    let diffOperation = diff(image1, image2)
+    return ImageComparisonResult(difference: diffOperation.outputImage!)
+}
+
+let workColorSpace = CGColorSpace(name: CGColorSpace.displayP3)!
+//let workColorSpace = CGColorSpace(name: CGColorSpace.extendedSRGB)!
+//let workColorSpace = CGColorSpace(name: CGColorSpace.extendedDisplayP3)!
+
+func compare(_ left: Data, _ right: Data) -> ImageComparisonResult {
+    let options: [CIImageOption : Any] = [
+        .colorSpace: workColorSpace,
+        .nearestSampling: NSNumber(booleanLiteral: true)
+    ]
+    let image1 = CIImage(data: left, options: options)!
+        .premultiplyingAlpha()
+    let image2 = CIImage(data: right, options: options)!
+        .premultiplyingAlpha()
     let diffOperation = diff(image1, image2)
     return ImageComparisonResult(difference: diffOperation.outputImage!)
 }
diff --git a/Sources/verifySnapshot.swift b/Sources/verifySnapshot.swift
index 580f8b6..fc5fafe 100644
--- a/Sources/verifySnapshot.swift
+++ b/Sources/verifySnapshot.swift
@@ -30,18 +30,14 @@ func ensureFolder(url: URL) throws {
 
 public func verifySnapshot<V: View>(_ view: V, _ name: String? = nil, colorAccuracy: Float = 0.02,
                                        file: StaticString = #filePath, line: UInt = #line) {
-    guard let image = try? inWindowView(view, block: {
-        $0.renderLayerAsBitmap()
+    guard let pngData = try? inWindowView(view, block: {
+        $0.renderHierarchyAsPNG()
     }) else {
         XCTFail("failed to get snapshot of view")
         return
     }
     let isRunningOnCI = ProcessInfo.processInfo.environment.keys.contains("CI")
     let shouldOverwriteExpected = !isRunningOnCI
-    guard let pngData = image.pngData() else {
-        XCTFail("failed to get image data")
-        return
-    }
     let viewName = name ?? "\(V.self)"
     let fileName = viewName + ".png"
     let url = folderUrl(String(describing: file)).appendingPathComponent(fileName)
@@ -53,13 +49,14 @@ public func verifySnapshot<V: View>(_ view: V, _ name: String? = nil, colorAccur
         }, onFailure, file: file, line: line)
     }
     
-    if let expectedData = try? Data(contentsOf: url), let expectedImage = UIImage(data: expectedData) {
+    if let expectedData = try? Data(contentsOf: url) {
         XCTContext.runActivity(named: viewName) {
             let actualImage = XCTAttachment(data: pngData, uniformTypeIdentifier: UTType.png.identifier)
             actualImage.name = "actual image"
             $0.add(actualImage)
-            let diff = compare(image, expectedImage)
-            if diff.maxColorDifference() > colorAccuracy {
+            let diff = compare(pngData, expectedData)
+            let actualDifference = diff.maxColorDifference()
+            if actualDifference > colorAccuracy {
                 if shouldOverwriteExpected {
                     writeActual(onFailure: "failed to record actual image")
                 }
@@ -74,11 +71,18 @@ public func verifySnapshot<V: View>(_ view: V, _ name: String? = nil, colorAccur
                 )
             }
             let ciImage = diff.difference
-            guard let diffImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else {
-                XCTFail("failed to get image of difference")
-                return
-            }
-            let diffAttachment = XCTAttachment(image: UIImage(cgImage: diffImage))
+            let context = CIContext(options: [
+                .workingColorSpace : workColorSpace,
+                .allowLowPower: NSNumber(booleanLiteral: false),
+                .highQualityDownsample: NSNumber(booleanLiteral: true),
+                .outputColorSpace: workColorSpace,
+                .useSoftwareRenderer: NSNumber(booleanLiteral: true),
+                .cacheIntermediates: NSNumber(booleanLiteral: false),
+                .priorityRequestLow: NSNumber(booleanLiteral: false),
+                .name: "difference"
+            ])
+            let data = context.pngRepresentation(of: ciImage.premultiplyingAlpha(), format: .RGBA8, colorSpace: workColorSpace)!
+            let diffAttachment = XCTAttachment(data: data, uniformTypeIdentifier: UTType.png.identifier)
             diffAttachment.name = "difference"
             $0.add(diffAttachment)
         }
@@ -107,7 +111,7 @@ func folderUrl(_ filePath: String = #filePath) -> URL {
  see: https://github.com/paulz/SwiftUI-snapshot-testing/issues/11
  */
 func allowAppearanceTransition() {
-    RunLoop.current.run(until: .init(timeIntervalSinceNow: 0))
+    RunLoop.current.run(until: .init(timeIntervalSinceNow: 0.01))
 }
 
 func inWindowView<V: View, T>(_ swiftUIView: V, block: (UIView) -> T) throws -> T {
@@ -127,8 +131,10 @@ func inWindowView<V: View, T>(_ swiftUIView: V, block: (UIView) -> T) throws ->
     if size == .zero {
         size = layoutFrame.size
     }
+    view.backgroundColor = .clear
     let safeOrigin = layoutFrame.origin
     rootController.addChild(controller)
+    allowAppearanceTransition()
     view.frame = .init(origin: safeOrigin, size: size)
     rootController.view.addSubview(controller.view)
     view.frame = .init(origin: safeOrigin, size: size)
@@ -136,6 +142,7 @@ func inWindowView<V: View, T>(_ swiftUIView: V, block: (UIView) -> T) throws ->
     defer {
         view.removeFromSuperview()
         controller.removeFromParent()
+        allowAppearanceTransition()
     }
     return block(view)
 }
diff --git a/Tests/CompareTest.swift b/Tests/CompareTest.swift
new file mode 100644
index 0000000..b452ed9
--- /dev/null
+++ b/Tests/CompareTest.swift
@@ -0,0 +1,12 @@
+@testable import ViewSnapshotTesting
+import XCTest
+
+class CompareTest: XCTestCase {
+    func testSameDataShouldHave0Difference() throws {
+        let expectedData = try Data(
+            contentsOf: folderUrl().appendingPathComponent("SampleView.png")
+        )
+        let result = compare(expectedData, expectedData)
+        XCTAssertEqual(result.maxColorDifference(), 0)
+    }
+}
diff --git a/Tests/SampleViewTest.swift b/Tests/SampleViewTest.swift
index f850664..4bcc33a 100644
--- a/Tests/SampleViewTest.swift
+++ b/Tests/SampleViewTest.swift
@@ -7,19 +7,33 @@ class SampleViewTest: XCTestCase {
     let expectedSize = CGSize(width: 30, height: 20)
 
     func testSwiftUIRendersInWindow() {
-        verifySnapshot(SampleView())
+        let options = XCTExpectedFailure.Options()
+        options.issueMatcher = { issue in
+            issue.type == .assertionFailure &&
+            issue.compactDescription.hasSuffix("unable to take snapshot of the view")
+        }
+        XCTExpectFailure("Unable to render SwiftUI view hierarchy",
+                         options: options)
+        // xctest warning:
+        // [Snapshotting] Rendering a view that has not been committed to render server is not supported.
+        verifySnapshot(SampleView(), "SampleView-blank", colorAccuracy: 0)
     }
     
     func testImageSizeIsScaledFromExpected() throws {
         let image = try inWindowView(SampleView()) {
             $0.renderLayerAsBitmap()
         }
+        let url = folderUrl().appendingPathComponent("SampleView.png")
         XCTAssertEqual(image.size, expectedSize)
-        let expectedData = try Data(
-            contentsOf: folderUrl().appendingPathComponent("SampleView.png")
-        )
-        let expectedImage = try XCTUnwrap(UIImage(data: expectedData))
-        let scale = UIScreen.main.scale
+        let expectedData = try Data(contentsOf: url)
+        let scale = UITraitCollection.snapshots.displayScale
+        let expectedImage = try XCTUnwrap(UIImage(data: expectedData, scale: scale))
+        let result = compare(image, expectedImage)
+        let colorDifference = result.maxColorDifference()
+        if colorDifference > 0 {
+            try image.pngData()?.write(to: url)
+        }
+        XCTAssertEqual(colorDifference, 0)
         XCTAssertEqual(expectedImage.size, expectedSize.applying(.init(scaleX: scale, y: scale)))
     }
 }
diff --git a/Tests/Snapshots/SampleView-blank.png b/Tests/Snapshots/SampleView-blank.png
new file mode 100644
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diff --git a/Tests/Snapshots/SampleView.png b/Tests/Snapshots/SampleView.png
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diff --git a/Tests/UIKitViewTest.swift b/Tests/UIKitViewTest.swift
index fac3685..e0f2882 100644
--- a/Tests/UIKitViewTest.swift
+++ b/Tests/UIKitViewTest.swift
@@ -21,11 +21,13 @@ class UIKitViewTest: XCTestCase {
         let image = sampleView.renderLayerAsBitmap()
         XCTAssertEqual(image.size, expectedSize)
         let pngData = try XCTUnwrap(image.pngData())
-        let existing = try Data(
-            contentsOf: folderUrl().appendingPathComponent("UIKit-sample-view.png")
-        )
-        XCTContext.runActivity(named: "compare image data") {
+        let url = folderUrl().appendingPathComponent("UIKit-sample-view.png")
+        let existing = try Data(contentsOf: url)
+        try XCTContext.runActivity(named: "compare image data") {
             $0.add(.init(data: pngData, uniformTypeIdentifier: UTType.png.identifier))
+            if existing != pngData {
+                try pngData.write(to: url)
+            }
             XCTAssertEqual(existing, pngData)
         }
     }