general: test redux

GazeTests/Services/FullscreenDetectionServiceTests.swift

@@ -0,0 +1,68 @@
+//
+//  FullscreenDetectionServiceTests.swift
+//  GazeTests
+//
+//  Unit tests for FullscreenDetectionService.
+//
+
+import Combine
+import XCTest
+@testable import Gaze
+
+@MainActor
+final class FullscreenDetectionServiceTests: XCTestCase {
+    
+    var service: FullscreenDetectionService!
+    var cancellables: Set<AnyCancellable>!
+    
+    override func setUp() async throws {
+        service = FullscreenDetectionService()
+        cancellables = []
+    }
+    
+    override func tearDown() async throws {
+        cancellables = nil
+        service = nil
+    }
+    
+    // MARK: - Initialization Tests
+    
+    func testServiceInitialization() {
+        XCTAssertNotNil(service)
+    }
+    
+    func testInitialFullscreenState() {
+        // Initially should not be in fullscreen (unless actually in fullscreen)
+        XCTAssertNotNil(service.isFullscreenActive)
+    }
+    
+    // MARK: - Publisher Tests
+    
+    func testFullscreenStatePublisher() async throws {
+        let expectation = XCTestExpectation(description: "Fullscreen state published")
+        
+        service.$isFullscreenActive
+            .sink { isFullscreen in
+                expectation.fulfill()
+            }
+            .store(in: &cancellables)
+        
+        await fulfillment(of: [expectation], timeout: 0.1)
+    }
+    
+    // MARK: - Force Update Tests
+    
+    func testForceUpdate() {
+        // Should not crash
+        service.forceUpdate()
+        XCTAssertNotNil(service.isFullscreenActive)
+    }
+    
+    // MARK: - Protocol Conformance Tests
+    
+    func testConformsToFullscreenDetectionProviding() {
+        let providing: FullscreenDetectionProviding = service
+        XCTAssertNotNil(providing)
+        XCTAssertNotNil(providing.isFullscreenActive)
+    }
+}