Yep. AI rewrote the whole thing.

2026-03-13 03:24:24 +11:00
parent e4719cb9f4
commit fe6c7d8c12
47 changed files with 5348 additions and 1182 deletions
--- a/Downterm/CommandNotchTests/AppSettingsControllerTests.swift
+++ b/Downterm/CommandNotchTests/AppSettingsControllerTests.swift
@@ -0,0 +1,42 @@
+import XCTest
+@testable import CommandNotch
+
+@MainActor
+final class AppSettingsControllerTests: XCTestCase {
+    func testTerminalSessionConfigurationIncludesShellPath() {
+        let store = InMemoryAppSettingsStore()
+        var settings = AppSettings.default
+        settings.terminal.shellPath = "/opt/homebrew/bin/fish"
+        store.storedSettings = settings
+
+        let controller = AppSettingsController(store: store)
+
+        XCTAssertEqual(controller.terminalSessionConfiguration.shellPath, "/opt/homebrew/bin/fish")
+    }
+
+    func testTerminalSizePresetsDecodeFromTypedSettings() {
+        let store = InMemoryAppSettingsStore()
+        let presets = [
+            TerminalSizePreset(name: "Wide", width: 960, height: 420, hotkey: .cmdShiftDigit(4))
+        ]
+        var settings = AppSettings.default
+        settings.terminal.sizePresetsJSON = TerminalSizePresetStore.encodePresets(presets)
+        store.storedSettings = settings
+
+        let controller = AppSettingsController(store: store)
+
+        XCTAssertEqual(controller.terminalSizePresets, presets)
+    }
+}
+
+private final class InMemoryAppSettingsStore: AppSettingsStoreType {
+    var storedSettings = AppSettings.default
+
+    func load() -> AppSettings {
+        storedSettings
+    }
+
+    func save(_ settings: AppSettings) {
+        storedSettings = settings
+    }
+}
--- a/Downterm/CommandNotchTests/AppSettingsStoreTests.swift
+++ b/Downterm/CommandNotchTests/AppSettingsStoreTests.swift
@@ -0,0 +1,38 @@
+import XCTest
+@testable import CommandNotch
+
+final class AppSettingsStoreTests: XCTestCase {
+    func testLoadReturnsDefaultValuesWhenStoreIsEmpty() {
+        let defaults = UserDefaults(suiteName: #function)!
+        defaults.removePersistentDomain(forName: #function)
+        defer { defaults.removePersistentDomain(forName: #function) }
+
+        let store = UserDefaultsAppSettingsStore(defaults: defaults)
+
+        XCTAssertEqual(store.load(), .default)
+    }
+
+    func testSaveRoundTripsSettings() {
+        let defaults = UserDefaults(suiteName: #function)!
+        defaults.removePersistentDomain(forName: #function)
+        defer { defaults.removePersistentDomain(forName: #function) }
+
+        let store = UserDefaultsAppSettingsStore(defaults: defaults)
+        var settings = AppSettings.default
+        settings.display.showMenuBarIcon = false
+        settings.display.showOnAllDisplays = false
+        settings.display.openWidth = 900
+        settings.behavior.minimumHoverDuration = 0.65
+        settings.appearance.blurRadius = 4.5
+        settings.terminal.fontSize = 16
+        settings.terminal.themeRawValue = TerminalTheme.dracula.rawValue
+        settings.terminal.sizePresetsJSON = TerminalSizePresetStore.encodePresets([
+            TerminalSizePreset(name: "Wide", width: 960, height: 420, hotkey: .cmdShiftDigit(4))
+        ])
+        settings.hotkeys.toggle = .cmdD
+
+        store.save(settings)
+
+        XCTAssertEqual(store.load(), settings)
+    }
+}
--- a/Downterm/CommandNotchTests/NotchOrchestratorTests.swift
+++ b/Downterm/CommandNotchTests/NotchOrchestratorTests.swift
@@ -0,0 +1,248 @@
+import XCTest
+import Combine
+@testable import CommandNotch
+
+@MainActor
+final class NotchOrchestratorTests: XCTestCase {
+    func testHoverOpenSchedulesOpenAfterDelay() {
+        let screenID = "screen-a"
+        let screen = makeScreenContext(screenID: screenID)
+        let registry = TestScreenRegistry(activeScreenID: screenID, screens: [screen])
+        let host = TestNotchPresentationHost()
+        let scheduler = TestScheduler()
+        let orchestrator = NotchOrchestrator(
+            screenRegistry: registry,
+            host: host,
+            settingsController: makeSettingsController(),
+            scheduler: scheduler
+        )
+
+        orchestrator.handleHoverChange(true, for: screenID)
+        XCTAssertEqual(screen.notchState, .closed)
+
+        scheduler.runScheduledActions()
+
+        XCTAssertEqual(screen.notchState, .open)
+        XCTAssertEqual(host.openedScreenIDs, [screenID])
+    }
+
+    func testHoverExitCancelsPendingOpen() {
+        let screenID = "screen-a"
+        let screen = makeScreenContext(screenID: screenID)
+        let registry = TestScreenRegistry(activeScreenID: screenID, screens: [screen])
+        let host = TestNotchPresentationHost()
+        let scheduler = TestScheduler()
+        let orchestrator = NotchOrchestrator(
+            screenRegistry: registry,
+            host: host,
+            settingsController: makeSettingsController(),
+            scheduler: scheduler
+        )
+
+        orchestrator.handleHoverChange(true, for: screenID)
+        orchestrator.handleHoverChange(false, for: screenID)
+
+        scheduler.runScheduledActions()
+
+        XCTAssertEqual(screen.notchState, .closed)
+        XCTAssertTrue(host.openedScreenIDs.isEmpty)
+    }
+
+    func testCloseWhileHoveringSuppressesReopenUntilHoverExit() {
+        let screenID = "screen-a"
+        let screen = makeScreenContext(screenID: screenID)
+        let registry = TestScreenRegistry(activeScreenID: screenID, screens: [screen])
+        let host = TestNotchPresentationHost()
+        let scheduler = TestScheduler()
+        let orchestrator = NotchOrchestrator(
+            screenRegistry: registry,
+            host: host,
+            settingsController: makeSettingsController(),
+            scheduler: scheduler
+        )
+
+        orchestrator.handleHoverChange(true, for: screenID)
+        scheduler.runScheduledActions()
+        XCTAssertEqual(screen.notchState, .open)
+
+        orchestrator.handleHoverChange(true, for: screenID)
+        orchestrator.close(screenID: screenID)
+        scheduler.runScheduledActions()
+
+        XCTAssertEqual(screen.notchState, .closed)
+        XCTAssertFalse(screen.isCloseTransitionActive)
+        XCTAssertTrue(screen.suppressHoverOpenUntilHoverExit)
+        XCTAssertEqual(host.closedScreenIDs, [screenID])
+
+        scheduler.runScheduledActions()
+        XCTAssertEqual(screen.notchState, .closed)
+        XCTAssertEqual(host.openedScreenIDs, [screenID])
+
+        orchestrator.handleHoverChange(false, for: screenID)
+        XCTAssertFalse(screen.suppressHoverOpenUntilHoverExit)
+    }
+
+    func testOpeningSharedWorkspaceOnAnotherScreenClosesPreviousPresenter() {
+        let workspaceID = UUID()
+        let firstScreen = makeScreenContext(screenID: "screen-a", workspaceID: workspaceID)
+        let secondScreen = makeScreenContext(screenID: "screen-b", workspaceID: workspaceID)
+        let registry = TestScreenRegistry(activeScreenID: "screen-b", screens: [firstScreen, secondScreen])
+        let host = TestNotchPresentationHost()
+        let orchestrator = NotchOrchestrator(
+            screenRegistry: registry,
+            host: host,
+            settingsController: makeSettingsController(),
+            scheduler: TestScheduler()
+        )
+
+        orchestrator.open(screenID: "screen-a")
+        orchestrator.open(screenID: "screen-b")
+
+        XCTAssertEqual(firstScreen.notchState, .closed)
+        XCTAssertEqual(secondScreen.notchState, .open)
+        XCTAssertEqual(host.closedScreenIDs, ["screen-a"])
+        XCTAssertEqual(registry.presentingScreenID(for: workspaceID), "screen-b")
+    }
+
+    func testOpeningDifferentWorkspaceDoesNotCloseOtherOpenScreen() {
+        let firstScreen = makeScreenContext(screenID: "screen-a", workspaceID: UUID())
+        let secondScreen = makeScreenContext(screenID: "screen-b", workspaceID: UUID())
+        let registry = TestScreenRegistry(activeScreenID: "screen-b", screens: [firstScreen, secondScreen])
+        let host = TestNotchPresentationHost()
+        let orchestrator = NotchOrchestrator(
+            screenRegistry: registry,
+            host: host,
+            settingsController: makeSettingsController(),
+            scheduler: TestScheduler()
+        )
+
+        orchestrator.open(screenID: "screen-a")
+        orchestrator.open(screenID: "screen-b")
+
+        XCTAssertEqual(firstScreen.notchState, .open)
+        XCTAssertEqual(secondScreen.notchState, .open)
+        XCTAssertTrue(host.closedScreenIDs.isEmpty)
+        XCTAssertEqual(registry.presentingScreenID(for: firstScreen.workspaceID), "screen-a")
+        XCTAssertEqual(registry.presentingScreenID(for: secondScreen.workspaceID), "screen-b")
+    }
+
+    private func makeScreenContext(screenID: ScreenID, workspaceID: WorkspaceID = UUID()) -> ScreenContext {
+        ScreenContext(
+            id: screenID,
+            workspaceID: workspaceID,
+            settingsController: makeSettingsController(),
+            screenProvider: { _ in nil }
+        )
+    }
+
+    private func makeSettingsController() -> AppSettingsController {
+        let store = TestOrchestratorSettingsStore()
+        var settings = AppSettings.default
+        settings.behavior.openNotchOnHover = true
+        settings.behavior.minimumHoverDuration = 0.3
+        store.storedSettings = settings
+        return AppSettingsController(store: store)
+    }
+}
+
+@MainActor
+private final class TestScreenRegistry: ScreenRegistryType {
+    private let activeID: ScreenID
+    private var screensByID: [ScreenID: ScreenContext]
+    private var workspacePresenters: [WorkspaceID: ScreenID] = [:]
+
+    init(activeScreenID: ScreenID, screens: [ScreenContext]) {
+        self.activeID = activeScreenID
+        self.screensByID = Dictionary(uniqueKeysWithValues: screens.map { ($0.id, $0) })
+    }
+
+    func allScreens() -> [ScreenContext] {
+        Array(screensByID.values)
+    }
+
+    func screenContext(for id: ScreenID) -> ScreenContext? {
+        screensByID[id]
+    }
+
+    func activeScreenID() -> ScreenID? {
+        activeID
+    }
+
+    func presentingScreenID(for workspaceID: WorkspaceID) -> ScreenID? {
+        workspacePresenters[workspaceID]
+    }
+
+    func claimWorkspacePresentation(for screenID: ScreenID) -> ScreenID? {
+        guard let workspaceID = screensByID[screenID]?.workspaceID else { return nil }
+        let previous = workspacePresenters[workspaceID]
+        workspacePresenters[workspaceID] = screenID
+        return previous == screenID ? nil : previous
+    }
+
+    func releaseWorkspacePresentation(for screenID: ScreenID) {
+        workspacePresenters = workspacePresenters.filter { $0.value != screenID }
+    }
+}
+
+@MainActor
+private final class TestNotchPresentationHost: NotchPresentationHost {
+    var openedScreenIDs: [ScreenID] = []
+    var closedScreenIDs: [ScreenID] = []
+
+    func canPresentNotch(for screenID: ScreenID) -> Bool {
+        true
+    }
+
+    func performOpenPresentation(for screenID: ScreenID) {
+        openedScreenIDs.append(screenID)
+    }
+
+    func performClosePresentation(for screenID: ScreenID) {
+        closedScreenIDs.append(screenID)
+    }
+}
+
+private final class TestScheduler: SchedulerType {
+    private final class ScheduledAction {
+        let action: @MainActor () -> Void
+        var isCancelled = false
+
+        init(action: @escaping @MainActor () -> Void) {
+            self.action = action
+        }
+    }
+
+    private var scheduledActions: [ScheduledAction] = []
+
+    @MainActor
+    func schedule(after interval: TimeInterval, action: @escaping @MainActor () -> Void) -> AnyCancellable {
+        let scheduledAction = ScheduledAction(action: action)
+        scheduledActions.append(scheduledAction)
+
+        return AnyCancellable {
+            scheduledAction.isCancelled = true
+        }
+    }
+
+    @MainActor
+    func runScheduledActions() {
+        let actions = scheduledActions
+        scheduledActions.removeAll()
+
+        for scheduledAction in actions where !scheduledAction.isCancelled {
+            scheduledAction.action()
+        }
+    }
+}
+
+private final class TestOrchestratorSettingsStore: AppSettingsStoreType {
+    var storedSettings = AppSettings.default
+
+    func load() -> AppSettings {
+        storedSettings
+    }
+
+    func save(_ settings: AppSettings) {
+        storedSettings = settings
+    }
+}
--- a/Downterm/CommandNotchTests/ScreenContextTests.swift
+++ b/Downterm/CommandNotchTests/ScreenContextTests.swift
@@ -0,0 +1,67 @@
+import XCTest
+@testable import CommandNotch
+
+@MainActor
+final class ScreenContextTests: XCTestCase {
+    func testInteractiveResizeDefersPersistingSettingsUntilResizeEnds() {
+        let store = ScreenContextTestSettingsStore()
+        var settings = AppSettings.default
+        settings.display.openWidth = 640
+        settings.display.openHeight = 350
+        store.storedSettings = settings
+
+        let controller = AppSettingsController(store: store)
+        let screen = ScreenContext(
+            id: "screen-a",
+            workspaceID: UUID(),
+            settingsController: controller,
+            screenProvider: { _ in nil }
+        )
+
+        screen.open()
+        screen.beginInteractiveResize()
+        screen.resizeOpenNotch(to: CGSize(width: 800, height: 420))
+
+        XCTAssertEqual(screen.notchSize.width, 800)
+        XCTAssertEqual(screen.notchSize.height, 420)
+        XCTAssertEqual(controller.settings.display.openWidth, 640)
+        XCTAssertEqual(controller.settings.display.openHeight, 350)
+
+        screen.endInteractiveResize()
+
+        XCTAssertEqual(controller.settings.display.openWidth, 800)
+        XCTAssertEqual(controller.settings.display.openHeight, 420)
+        XCTAssertEqual(store.storedSettings.display.openWidth, 800)
+        XCTAssertEqual(store.storedSettings.display.openHeight, 420)
+    }
+
+    func testFocusLossAutoCloseSuppressionCanBeToggled() {
+        let controller = AppSettingsController(store: ScreenContextTestSettingsStore())
+        let screen = ScreenContext(
+            id: "screen-a",
+            workspaceID: UUID(),
+            settingsController: controller,
+            screenProvider: { _ in nil }
+        )
+
+        XCTAssertFalse(screen.suppressCloseOnFocusLoss)
+
+        screen.setCloseOnFocusLossSuppressed(true)
+        XCTAssertTrue(screen.suppressCloseOnFocusLoss)
+
+        screen.setCloseOnFocusLossSuppressed(false)
+        XCTAssertFalse(screen.suppressCloseOnFocusLoss)
+    }
+}
+
+private final class ScreenContextTestSettingsStore: AppSettingsStoreType {
+    var storedSettings = AppSettings.default
+
+    func load() -> AppSettings {
+        storedSettings
+    }
+
+    func save(_ settings: AppSettings) {
+        storedSettings = settings
+    }
+}
--- a/Downterm/CommandNotchTests/ScreenRegistryTests.swift
+++ b/Downterm/CommandNotchTests/ScreenRegistryTests.swift
@@ -0,0 +1,319 @@
+import XCTest
+@testable import CommandNotch
+
+@MainActor
+final class ScreenRegistryTests: XCTestCase {
+    func testRefreshCreatesContextsForConnectedScreensUsingDefaultWorkspace() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            connectedScreenIDsProvider: { ["screen-a", "screen-b"] },
+            activeScreenIDProvider: { "screen-b" },
+            screenLookup: { _ in nil }
+        )
+
+        XCTAssertEqual(registry.allScreens().map(\.id), ["screen-a", "screen-b"])
+        XCTAssertEqual(
+            registry.allScreens().map(\.workspaceID),
+            [workspaceRegistry.defaultWorkspaceID, workspaceRegistry.defaultWorkspaceID]
+        )
+        XCTAssertEqual(registry.activeScreenID(), "screen-b")
+    }
+
+    func testAssignWorkspaceUpdatesContextAndSurvivesReconnect() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        var connectedScreenIDs = ["screen-a"]
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            connectedScreenIDsProvider: { connectedScreenIDs },
+            activeScreenIDProvider: { connectedScreenIDs.first },
+            screenLookup: { _ in nil }
+        )
+        let docsWorkspaceID = workspaceRegistry.createWorkspace(named: "Docs")
+
+        registry.assignWorkspace(docsWorkspaceID, to: "screen-a")
+        XCTAssertEqual(registry.screenContext(for: "screen-a")?.workspaceID, docsWorkspaceID)
+
+        connectedScreenIDs = []
+        registry.refreshConnectedScreens()
+        XCTAssertNil(registry.screenContext(for: "screen-a"))
+
+        connectedScreenIDs = ["screen-a"]
+        registry.refreshConnectedScreens()
+        XCTAssertEqual(registry.screenContext(for: "screen-a")?.workspaceID, docsWorkspaceID)
+    }
+
+    func testDeletedWorkspaceAssignmentFallsBackToDefaultWorkspace() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        let assignmentStore = InMemoryScreenAssignmentStore()
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            assignmentStore: assignmentStore,
+            connectedScreenIDsProvider: { ["screen-a"] },
+            activeScreenIDProvider: { "screen-a" },
+            screenLookup: { _ in nil }
+        )
+        let reviewWorkspaceID = workspaceRegistry.createWorkspace(named: "Review")
+
+        registry.assignWorkspace(reviewWorkspaceID, to: "screen-a")
+        workspaceRegistry.deleteWorkspace(id: reviewWorkspaceID)
+        registry.refreshConnectedScreens()
+
+        XCTAssertEqual(
+            registry.screenContext(for: "screen-a")?.workspaceID,
+            workspaceRegistry.defaultWorkspaceID
+        )
+        XCTAssertEqual(
+            assignmentStore.savedAssignments["screen-a"],
+            workspaceRegistry.defaultWorkspaceID
+        )
+    }
+
+    func testRegistryLoadsPersistedAssignmentsFromStore() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        let docsWorkspaceID = workspaceRegistry.createWorkspace(named: "Docs")
+        let assignmentStore = InMemoryScreenAssignmentStore()
+        assignmentStore.savedAssignments = ["screen-a": docsWorkspaceID]
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            assignmentStore: assignmentStore,
+            connectedScreenIDsProvider: { ["screen-a"] },
+            activeScreenIDProvider: { "screen-a" },
+            screenLookup: { _ in nil }
+        )
+
+        XCTAssertEqual(registry.screenContext(for: "screen-a")?.workspaceID, docsWorkspaceID)
+    }
+
+    func testAssignWorkspacePersistsAssignments() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        let assignmentStore = InMemoryScreenAssignmentStore()
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            assignmentStore: assignmentStore,
+            connectedScreenIDsProvider: { ["screen-a"] },
+            activeScreenIDProvider: { "screen-a" },
+            screenLookup: { _ in nil }
+        )
+        let reviewWorkspaceID = workspaceRegistry.createWorkspace(named: "Review")
+
+        registry.assignWorkspace(reviewWorkspaceID, to: "screen-a")
+
+        XCTAssertEqual(assignmentStore.savedAssignments["screen-a"], reviewWorkspaceID)
+    }
+
+    func testWorkspaceControllerTracksAssignedWorkspace() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            connectedScreenIDsProvider: { ["screen-a"] },
+            activeScreenIDProvider: { "screen-a" },
+            screenLookup: { _ in nil }
+        )
+        let docsWorkspaceID = workspaceRegistry.createWorkspace(named: "Docs")
+
+        XCTAssertEqual(registry.workspaceController(for: "screen-a").id, workspaceRegistry.defaultWorkspaceID)
+
+        registry.assignWorkspace(docsWorkspaceID, to: "screen-a")
+
+        XCTAssertEqual(registry.workspaceController(for: "screen-a").id, docsWorkspaceID)
+    }
+
+    func testDeleteWorkspaceReassignsConnectedAndPersistedScreensToFallback() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        let docsWorkspaceID = workspaceRegistry.createWorkspace(named: "Docs")
+        let reviewWorkspaceID = workspaceRegistry.createWorkspace(named: "Review")
+        let assignmentStore = InMemoryScreenAssignmentStore()
+        assignmentStore.savedAssignments = ["screen-a": docsWorkspaceID, "screen-b": docsWorkspaceID]
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            assignmentStore: assignmentStore,
+            connectedScreenIDsProvider: { ["screen-a"] },
+            activeScreenIDProvider: { "screen-a" },
+            screenLookup: { _ in nil }
+        )
+
+        registry.assignWorkspace(docsWorkspaceID, to: "screen-a")
+
+        let fallbackWorkspaceID = registry.deleteWorkspace(
+            docsWorkspaceID,
+            preferredFallback: reviewWorkspaceID
+        )
+
+        XCTAssertEqual(fallbackWorkspaceID, reviewWorkspaceID)
+        XCTAssertEqual(registry.screenContext(for: "screen-a")?.workspaceID, reviewWorkspaceID)
+        XCTAssertEqual(assignmentStore.savedAssignments["screen-a"], reviewWorkspaceID)
+        XCTAssertEqual(assignmentStore.savedAssignments["screen-b"], reviewWorkspaceID)
+    }
+
+    func testAssignedScreenCountIncludesDisconnectedAssignments() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        let docsWorkspaceID = workspaceRegistry.createWorkspace(named: "Docs")
+        let assignmentStore = InMemoryScreenAssignmentStore()
+        assignmentStore.savedAssignments = ["screen-a": docsWorkspaceID, "screen-b": docsWorkspaceID]
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            assignmentStore: assignmentStore,
+            connectedScreenIDsProvider: { ["screen-a"] },
+            activeScreenIDProvider: { "screen-a" },
+            screenLookup: { _ in nil }
+        )
+
+        XCTAssertEqual(registry.assignedScreenCount(to: docsWorkspaceID), 2)
+        XCTAssertEqual(registry.assignedScreenIDs(to: docsWorkspaceID), ["screen-a", "screen-b"])
+    }
+
+    func testClaimWorkspacePresentationTracksPresenterPerWorkspace() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        let docsWorkspaceID = workspaceRegistry.createWorkspace(named: "Docs")
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            connectedScreenIDsProvider: { ["screen-a", "screen-b"] },
+            activeScreenIDProvider: { "screen-a" },
+            screenLookup: { _ in nil }
+        )
+
+        registry.assignWorkspace(docsWorkspaceID, to: "screen-a")
+        registry.assignWorkspace(docsWorkspaceID, to: "screen-b")
+
+        XCTAssertNil(registry.claimWorkspacePresentation(for: "screen-a"))
+        XCTAssertEqual(registry.presentingScreenID(for: docsWorkspaceID), "screen-a")
+        XCTAssertEqual(registry.claimWorkspacePresentation(for: "screen-b"), "screen-a")
+        XCTAssertEqual(registry.presentingScreenID(for: docsWorkspaceID), "screen-b")
+
+        registry.releaseWorkspacePresentation(for: "screen-b")
+        XCTAssertNil(registry.presentingScreenID(for: docsWorkspaceID))
+    }
+
+    func testAssignWorkspaceReleasesPreviousPresentationOwnership() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        let docsWorkspaceID = workspaceRegistry.createWorkspace(named: "Docs")
+        let reviewWorkspaceID = workspaceRegistry.createWorkspace(named: "Review")
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            connectedScreenIDsProvider: { ["screen-a"] },
+            activeScreenIDProvider: { "screen-a" },
+            screenLookup: { _ in nil }
+        )
+
+        registry.assignWorkspace(docsWorkspaceID, to: "screen-a")
+        _ = registry.claimWorkspacePresentation(for: "screen-a")
+        XCTAssertEqual(registry.presentingScreenID(for: docsWorkspaceID), "screen-a")
+
+        registry.assignWorkspace(reviewWorkspaceID, to: "screen-a")
+
+        XCTAssertNil(registry.presentingScreenID(for: docsWorkspaceID))
+        XCTAssertEqual(registry.screenContext(for: "screen-a")?.workspaceID, reviewWorkspaceID)
+    }
+
+    func testConnectedScreenSummariesReflectActiveScreenAndAssignments() {
+        let workspaceRegistry = makeWorkspaceRegistry()
+        let settingsController = makeSettingsController()
+        let docsWorkspaceID = workspaceRegistry.createWorkspace(named: "Docs")
+        let registry = ScreenRegistry(
+            workspaceRegistry: workspaceRegistry,
+            settingsController: settingsController,
+            connectedScreenIDsProvider: { ["screen-a", "screen-b"] },
+            activeScreenIDProvider: { "screen-b" },
+            screenLookup: { _ in nil }
+        )
+
+        registry.assignWorkspace(docsWorkspaceID, to: "screen-a")
+
+        XCTAssertEqual(
+            registry.connectedScreenSummaries(),
+            [
+                ConnectedScreenSummary(
+                    id: "screen-a",
+                    displayName: "Screen 1",
+                    isActive: false,
+                    assignedWorkspaceID: docsWorkspaceID
+                ),
+                ConnectedScreenSummary(
+                    id: "screen-b",
+                    displayName: "Screen 2",
+                    isActive: true,
+                    assignedWorkspaceID: workspaceRegistry.defaultWorkspaceID
+                )
+            ]
+        )
+    }
+
+    private func makeWorkspaceRegistry() -> WorkspaceRegistry {
+        let settingsProvider = ScreenRegistryTestSettingsProvider()
+        let sessionFactory = ScreenRegistryUnusedTerminalSessionFactory()
+
+        return WorkspaceRegistry(
+            initialWorkspaces: [],
+            controllerFactory: { summary in
+                WorkspaceController(
+                    summary: summary,
+                    sessionFactory: sessionFactory,
+                    settingsProvider: settingsProvider,
+                    bootstrapDefaultTab: false
+                )
+            }
+        )
+    }
+
+    private func makeSettingsController() -> AppSettingsController {
+        AppSettingsController(store: TestAppSettingsStore())
+    }
+}
+
+private final class InMemoryScreenAssignmentStore: ScreenAssignmentStoreType {
+    var savedAssignments: [ScreenID: WorkspaceID] = [:]
+
+    func loadScreenAssignments() -> [ScreenID: WorkspaceID] {
+        savedAssignments
+    }
+
+    func saveScreenAssignments(_ assignments: [ScreenID: WorkspaceID]) {
+        savedAssignments = assignments
+    }
+}
+
+private final class TestAppSettingsStore: AppSettingsStoreType {
+    private var storedSettings = AppSettings.default
+
+    func load() -> AppSettings {
+        storedSettings
+    }
+
+    func save(_ settings: AppSettings) {
+        storedSettings = settings
+    }
+}
+
+private final class ScreenRegistryTestSettingsProvider: TerminalSessionConfigurationProviding {
+    let terminalSessionConfiguration = TerminalSessionConfiguration(fontSize: 13, theme: .terminalApp, shellPath: "")
+    let hotkeySettings = AppSettings.default.hotkeys
+    let terminalSizePresets = TerminalSizePresetStore.loadDefaults()
+}
+
+private struct ScreenRegistryUnusedTerminalSessionFactory: TerminalSessionFactoryType {
+    @MainActor
+    func makeSession(fontSize: CGFloat, theme: TerminalTheme, shellPath: String) -> TerminalSession {
+        fatalError("ScreenRegistryTests should not create live terminal sessions.")
+    }
+}
--- a/Downterm/CommandNotchTests/WindowFrameCalculatorTests.swift
+++ b/Downterm/CommandNotchTests/WindowFrameCalculatorTests.swift
@@ -0,0 +1,32 @@
+import XCTest
+@testable import CommandNotch
+
+final class WindowFrameCalculatorTests: XCTestCase {
+    func testClosedStateCentersWindowOnScreen() {
+        let frame = WindowFrameCalculator.targetFrame(
+            screenFrame: CGRect(x: 100, y: 50, width: 1600, height: 900),
+            currentWindowFrame: CGRect(x: 300, y: 0, width: 0, height: 0),
+            notchState: .closed,
+            contentSize: CGSize(width: 800, height: 300),
+            centerHorizontally: false
+        )
+
+        XCTAssertEqual(frame.origin.x, 480, accuracy: 0.001)
+        XCTAssertEqual(frame.origin.y, 630, accuracy: 0.001)
+        XCTAssertEqual(frame.size.width, 840, accuracy: 0.001)
+        XCTAssertEqual(frame.size.height, 320, accuracy: 0.001)
+    }
+
+    func testOpenStateClampsDraggedFrameWithinScreenBounds() {
+        let frame = WindowFrameCalculator.targetFrame(
+            screenFrame: CGRect(x: 0, y: 0, width: 1440, height: 900),
+            currentWindowFrame: CGRect(x: 1200, y: 0, width: 0, height: 0),
+            notchState: .open,
+            contentSize: CGSize(width: 900, height: 320),
+            centerHorizontally: false
+        )
+
+        XCTAssertEqual(frame.origin.x, 500, accuracy: 0.001)
+        XCTAssertEqual(frame.origin.y, 560, accuracy: 0.001)
+    }
+}
--- a/Downterm/CommandNotchTests/WorkspaceRegistryTests.swift
+++ b/Downterm/CommandNotchTests/WorkspaceRegistryTests.swift
@@ -0,0 +1,122 @@
+import XCTest
+@testable import CommandNotch
+
+@MainActor
+final class WorkspaceRegistryTests: XCTestCase {
+    func testRegistryCreatesDefaultWorkspaceWhenEmpty() {
+        let registry = makeRegistry()
+
+        XCTAssertEqual(registry.allWorkspaceSummaries().count, 1)
+        XCTAssertEqual(registry.allWorkspaceSummaries().first?.name, "Main")
+        XCTAssertNotNil(registry.controller(for: registry.defaultWorkspaceID))
+    }
+
+    func testCreateRenameAndDeleteWorkspaceUpdatesSummaries() {
+        let registry = makeRegistry()
+        let createdID = registry.createWorkspace(named: "Docs")
+
+        XCTAssertEqual(registry.allWorkspaceSummaries().map(\.name), ["Main", "Docs"])
+
+        registry.renameWorkspace(id: createdID, to: "Review")
+        XCTAssertEqual(registry.allWorkspaceSummaries().map(\.name), ["Main", "Review"])
+
+        registry.deleteWorkspace(id: createdID)
+        XCTAssertEqual(registry.allWorkspaceSummaries().map(\.name), ["Main"])
+    }
+
+    func testDeletingLastWorkspaceIsIgnored() {
+        let registry = makeRegistry()
+        let onlyWorkspaceID = registry.defaultWorkspaceID
+
+        registry.deleteWorkspace(id: onlyWorkspaceID)
+
+        XCTAssertEqual(registry.allWorkspaceSummaries().count, 1)
+        XCTAssertEqual(registry.allWorkspaceSummaries().first?.id, onlyWorkspaceID)
+    }
+
+    func testDeletionFallbackPrefersRequestedWorkspaceWhenAvailable() {
+        let registry = makeRegistry()
+        let docsID = registry.createWorkspace(named: "Docs")
+        let reviewID = registry.createWorkspace(named: "Review")
+
+        let fallback = registry.deletionFallbackWorkspaceID(
+            forDeleting: docsID,
+            preferredFallback: reviewID
+        )
+
+        XCTAssertEqual(fallback, reviewID)
+    }
+
+    func testRegistryLoadsPersistedWorkspacesFromStore() {
+        let store = InMemoryWorkspaceStore()
+        let docsID = UUID(uuidString: "11111111-1111-1111-1111-111111111111")!
+        store.savedSummaries = [WorkspaceSummary(id: docsID, name: "Docs")]
+
+        let registry = makeRegistry(initialWorkspaces: nil, store: store)
+
+        XCTAssertEqual(registry.allWorkspaceSummaries().count, 1)
+        XCTAssertEqual(registry.allWorkspaceSummaries().first?.id, docsID)
+        XCTAssertEqual(registry.allWorkspaceSummaries().first?.name, "Docs")
+        XCTAssertEqual(registry.defaultWorkspaceID, docsID)
+    }
+
+    func testRegistryPersistsWorkspaceSummaryChanges() {
+        let store = InMemoryWorkspaceStore()
+        let registry = makeRegistry(store: store)
+        let createdID = registry.createWorkspace(named: "Docs")
+
+        XCTAssertEqual(store.savedSummaries.map(\.name), ["Main", "Docs"])
+
+        registry.renameWorkspace(id: createdID, to: "Review")
+        XCTAssertEqual(store.savedSummaries.map(\.name), ["Main", "Review"])
+
+        registry.deleteWorkspace(id: createdID)
+        XCTAssertEqual(store.savedSummaries.map(\.name), ["Main"])
+    }
+
+    private func makeRegistry(
+        initialWorkspaces: [WorkspaceSummary]? = [],
+        store: (any WorkspaceStoreType)? = nil
+    ) -> WorkspaceRegistry {
+        let settingsProvider = TestSettingsProvider()
+        let sessionFactory = UnusedTerminalSessionFactory()
+
+        return WorkspaceRegistry(
+            initialWorkspaces: initialWorkspaces,
+            store: store,
+            controllerFactory: { summary in
+                WorkspaceController(
+                    summary: summary,
+                    sessionFactory: sessionFactory,
+                    settingsProvider: settingsProvider,
+                    bootstrapDefaultTab: false
+                )
+            }
+        )
+    }
+}
+
+private final class InMemoryWorkspaceStore: WorkspaceStoreType {
+    var savedSummaries: [WorkspaceSummary] = []
+
+    func loadWorkspaceSummaries() -> [WorkspaceSummary] {
+        savedSummaries
+    }
+
+    func saveWorkspaceSummaries(_ summaries: [WorkspaceSummary]) {
+        savedSummaries = summaries
+    }
+}
+
+private final class TestSettingsProvider: TerminalSessionConfigurationProviding {
+    let terminalSessionConfiguration = TerminalSessionConfiguration(fontSize: 13, theme: .terminalApp, shellPath: "")
+    let hotkeySettings = AppSettings.default.hotkeys
+    let terminalSizePresets = TerminalSizePresetStore.loadDefaults()
+}
+
+private struct UnusedTerminalSessionFactory: TerminalSessionFactoryType {
+    @MainActor
+    func makeSession(fontSize: CGFloat, theme: TerminalTheme, shellPath: String) -> TerminalSession {
+        fatalError("WorkspaceRegistryTests should not create live terminal sessions.")
+    }
+}
--- a/Downterm/CommandNotchTests/WorkspaceStoreTests.swift
+++ b/Downterm/CommandNotchTests/WorkspaceStoreTests.swift
@@ -0,0 +1,36 @@
+import XCTest
+@testable import CommandNotch
+
+final class WorkspaceStoreTests: XCTestCase {
+    func testWorkspaceStoreRoundTripsSummaries() {
+        let defaults = UserDefaults(suiteName: #function)!
+        defaults.removePersistentDomain(forName: #function)
+        defer { defaults.removePersistentDomain(forName: #function) }
+
+        let store = UserDefaultsWorkspaceStore(defaults: defaults)
+        let summaries = [
+            WorkspaceSummary(id: UUID(uuidString: "11111111-1111-1111-1111-111111111111")!, name: "Main"),
+            WorkspaceSummary(id: UUID(uuidString: "22222222-2222-2222-2222-222222222222")!, name: "Docs")
+        ]
+
+        store.saveWorkspaceSummaries(summaries)
+
+        XCTAssertEqual(store.loadWorkspaceSummaries(), summaries)
+    }
+
+    func testScreenAssignmentStoreRoundTripsAssignments() {
+        let defaults = UserDefaults(suiteName: #function)!
+        defaults.removePersistentDomain(forName: #function)
+        defer { defaults.removePersistentDomain(forName: #function) }
+
+        let store = UserDefaultsScreenAssignmentStore(defaults: defaults)
+        let assignments: [ScreenID: WorkspaceID] = [
+            "screen-a": UUID(uuidString: "11111111-1111-1111-1111-111111111111")!,
+            "screen-b": UUID(uuidString: "22222222-2222-2222-2222-222222222222")!
+        ]
+
+        store.saveScreenAssignments(assignments)
+
+        XCTAssertEqual(store.loadScreenAssignments(), assignments)
+    }
+}