Make snapshot helpers reproducible

Tests/MapLibreSwiftUITests/Examples/CameraPreviewTests.swift

@@ -4,7 +4,7 @@ import XCTest
 
 final class CameraPreviewTests: XCTestCase {
     func testCameraPreview() {
-        assertView(named: "CameraPreview") {
+        assertView {
             CameraDirectManipulationPreview(
                 styleURL: URL(string: "https://demotiles.maplibre.org/style.json")!
             )

Tests/MapLibreSwiftUITests/Examples/MapControlsTests.swift

@@ -1,79 +1,104 @@
+import CoreLocation
 import MapLibreSwiftDSL
 import SnapshotTesting
 import XCTest
 @testable import MapLibreSwiftUI
 
 final class MapControlsTests: XCTestCase {
+    // NOTE: The map views in this test intentionally have a non-north orientation
+    // so that the compass will be rendered if present.
+
     @MainActor
     func testEmptyControls() {
         assertView {
-            MapView(styleURL: demoTilesURL)
-                .mapControls {
-                    // No controls
-                }
+            MapView(
+                styleURL: demoTilesURL,
+                camera: .constant(.center(CLLocationCoordinate2D(), zoom: 4, direction: 45))
+            )
+            .mapControls {
+                // No controls
+            }
         }
     }
 
     @MainActor
     func testLogoOnly() {
         assertView {
-            MapView(styleURL: demoTilesURL)
-                .mapControls {
-                    LogoView()
-                }
+            MapView(
+                styleURL: demoTilesURL,
+                camera: .constant(.center(CLLocationCoordinate2D(), zoom: 4, direction: 45))
+            )
+            .mapControls {
+                LogoView()
+            }
         }
     }
 
     @MainActor
     func testLogoChangePosition() {
         assertView {
-            MapView(styleURL: demoTilesURL)
-                .mapControls {
-                    LogoView()
-                        .position(.topLeft)
-                }
+            MapView(
+                styleURL: demoTilesURL,
+                camera: .constant(.center(CLLocationCoordinate2D(), zoom: 4, direction: 45))
+            )
+            .mapControls {
+                LogoView()
+                    .position(.topLeft)
+            }
         }
     }
 
     @MainActor
     func testCompassOnly() {
         assertView {
-            MapView(styleURL: demoTilesURL)
-                .mapControls {
-                    CompassView()
-                }
+            MapView(
+                styleURL: demoTilesURL,
+                camera: .constant(.center(CLLocationCoordinate2D(), zoom: 4, direction: 45))
+            )
+            .mapControls {
+                CompassView()
+            }
         }
     }
 
     @MainActor
     func testCompassChangePosition() {
         assertView {
-            MapView(styleURL: demoTilesURL)
-                .mapControls {
-                    CompassView()
-                        .position(.topLeft)
-                }
+            MapView(
+                styleURL: demoTilesURL,
+                camera: .constant(.center(CLLocationCoordinate2D(), zoom: 4, direction: 45))
+            )
+            .mapControls {
+                CompassView()
+                    .position(.topLeft)
+            }
         }
     }
 
     @MainActor
     func testAttributionOnly() {
         assertView {
-            MapView(styleURL: demoTilesURL)
-                .mapControls {
-                    AttributionButton()
-                }
+            MapView(
+                styleURL: demoTilesURL,
+                camera: .constant(.center(CLLocationCoordinate2D(), zoom: 4, direction: 45))
+            )
+            .mapControls {
+                AttributionButton()
+            }
         }
     }
 
     @MainActor
     func testAttributionChangePosition() {
         assertView {
-            MapView(styleURL: demoTilesURL)
-                .mapControls {
-                    AttributionButton()
-                        .position(.topLeft)
-                }
+            MapView(
+                styleURL: demoTilesURL,
+                camera: .constant(.center(CLLocationCoordinate2D(), zoom: 4, direction: 45))
+            )
+            .mapControls {
+                AttributionButton()
+                    .position(.topLeft)
+            }
         }
     }
 }

Tests/MapLibreSwiftUITests/Support/XCTestAssertView.swift

@@ -7,6 +7,7 @@ extension XCTestCase {
     func assertView(
         named name: String? = nil,
         record: Bool = false,
+        colorScheme: ColorScheme = .light,
         frame: CGSize = CGSize(width: 430, height: 932),
         expectation _: XCTestExpectation? = nil,
         @ViewBuilder content: () -> some View,
@@ -15,7 +16,9 @@ extension XCTestCase {
         line: UInt = #line
     ) {
         let view = content()
+            .environment(\.colorScheme, colorScheme)
             .frame(width: frame.width, height: frame.height)
+            .background(Color(red: 130 / 255, green: 203 / 255, blue: 114 / 255))
 
         assertSnapshot(of: view,
                        as: .image(precision: 0.9, perceptualPrecision: 0.95),