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RosettaTests/ChatListBottomInsetTests.swift

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+import XCTest
+@testable import Rosetta
+
+/// Tests for ChatList bottom inset bug fix.
+/// Bug: Unwanted horizontal strip appears at bottom of ChatList (not in Calls/Settings).
+/// Fix: keep platform-specific bottom inset (72 on iOS < 26 custom tab bar, 0 on iOS 26+).
+final class ChatListBottomInsetTests: XCTestCase {
+
+    var controller: ChatListCollectionController!
+
+    override func setUp() {
+        super.setUp()
+        controller = ChatListCollectionController()
+    }
+
+    override func tearDown() {
+        controller = nil
+        super.tearDown()
+    }
+
+    private var expectedBottomInset: CGFloat {
+        if #available(iOS 26, *) {
+            return 0
+        } else {
+            return 72
+        }
+    }
+
+    // MARK: - RED Phase Tests (These FAIL before fix, PASS after fix)
+
+    /// Test 1: contentInset.bottom should match active tab implementation.
+    func testContentInsetBottomMatchesPlatform() {
+        // Force view load to trigger setupCollectionView()
+        _ = controller.view
+
+        let collectionView = controller.value(forKey: "collectionView") as? UICollectionView
+        XCTAssertNotNil(collectionView, "Collection view should be initialized")
+
+        // iOS 26+: native TabView handles inset automatically (0 here).
+        // iOS < 26: custom floating tab bar needs 72pt manual inset.
+        XCTAssertEqual(
+            collectionView?.contentInset.bottom,
+            expectedBottomInset,
+            "Bottom inset should match platform-specific tab bar behavior"
+        )
+    }
+
+    /// Test 2: Verify automatic safe area adjustment is enabled
+    func testContentInsetAdjustmentBehaviorIsAutomatic() {
+        _ = controller.view
+
+        let collectionView = controller.value(forKey: "collectionView") as? UICollectionView
+        XCTAssertNotNil(collectionView, "Collection view should be initialized")
+
+        XCTAssertEqual(
+            collectionView?.contentInsetAdjustmentBehavior,
+            .automatic,
+            "Should use automatic adjustment (respects tab bar safe area)"
+        )
+    }
+
+    /// Test 3: Verify no excessive bottom inset (must not exceed custom tab bar space).
+    func testBottomInsetIsNotExcessive() {
+        _ = controller.view
+
+        let collectionView = controller.value(forKey: "collectionView") as? UICollectionView
+        XCTAssertNotNil(collectionView, "Collection view should be initialized")
+
+        let maxReasonableInset: CGFloat = 72
+        XCTAssertLessThanOrEqual(
+            collectionView?.contentInset.bottom ?? 0,
+            maxReasonableInset,
+            "Bottom inset should not exceed \(maxReasonableInset)pt"
+        )
+    }
+
+    // MARK: - Integration Tests
+
+    /// Test 4: Verify controller can be instantiated without crashes
+    func testControllerInitialization() {
+        XCTAssertNotNil(controller, "Controller should initialize successfully")
+        _ = controller.view
+        XCTAssertNotNil(controller.view, "View should load without crashes")
+    }
+
+    /// Test 5: Verify collection view constraints are properly set
+    func testCollectionViewConstraints() {
+        _ = controller.view
+
+        let collectionView = controller.value(forKey: "collectionView") as? UICollectionView
+        XCTAssertNotNil(collectionView, "Collection view should be initialized")
+
+        // Collection view should be edge-to-edge (no custom insets)
+        XCTAssertFalse(
+            collectionView?.translatesAutoresizingMaskIntoConstraints ?? true,
+            "Should use Auto Layout constraints"
+        )
+    }
+
+    // MARK: - Performance Tests
+
+    /// Test 6: Verify content inset query is fast (not computed on every access)
+    func testContentInsetPerformance() {
+        _ = controller.view
+
+        let collectionView = controller.value(forKey: "collectionView") as? UICollectionView
+        XCTAssertNotNil(collectionView)
+
+        measure {
+            for _ in 0..<1000 {
+                _ = collectionView?.contentInset.bottom
+            }
+        }
+    }
+}