Finished testing implementation

FastNotes/__tests__/detail-screen.test.tsx

@@ -0,0 +1,178 @@
+import { act, render, screen, waitFor } from "@testing-library/react-native"
+import React, { PropsWithChildren } from "react"
+
+import DetailScreen from "@/app/detail"
+import { AuthContext, AuthData } from "@/hooks/use-auth-context"
+import { supabase } from "@/libs/supabase"
+import { NotesProvider } from "@/src/notes/NotesContext"
+import { AppThemeProvider } from "@/src/theme/AppThemeProvider"
+import { useLocalSearchParams } from "expo-router"
+
+type Deferred<T> = {
+    promise: Promise<T>
+    resolve: (value: T) => void
+    reject: (reason?: unknown) => void
+}
+
+function createDeferred<T>(): Deferred<T> {
+    let resolve!: (value: T) => void
+    let reject!: (reason?: unknown) => void
+
+    const promise = new Promise<T>((innerResolve, innerReject) => {
+        resolve = innerResolve
+        reject = innerReject
+    })
+
+    return { promise, resolve, reject }
+}
+
+jest.mock("expo-router", () => ({
+    router: {
+        replace: jest.fn(),
+        back: jest.fn(),
+        canGoBack: jest.fn(),
+    },
+    useLocalSearchParams: jest.fn(),
+}))
+
+jest.mock("@/libs/supabase", () => ({
+    supabase: {
+        from: jest.fn(),
+    },
+    supabaseUrl: "https://example.supabase.co",
+    supabaseAnonKey: "test-anon-key",
+}))
+
+jest.mock("@/components/note-image-panel", () => ({
+    __esModule: true,
+    default: () => null,
+}))
+
+describe("DetailScreen", () => {
+    const mockUseLocalSearchParams = useLocalSearchParams as jest.MockedFunction<typeof useLocalSearchParams>
+    const mockSupabase = supabase as unknown as {
+        from: jest.Mock
+    }
+
+    function TestWrapper({ children }: PropsWithChildren) {
+        const authValue: AuthData = {
+            claims: {
+                sub: "user-1",
+                email: "user-1@example.com",
+            },
+            profile: {
+                id: "user-1",
+                email: "user-1@example.com",
+                username: null,
+                full_name: null,
+            },
+            isLoading: false,
+            isLoggedIn: true,
+        }
+
+        return (
+            <AppThemeProvider>
+                <AuthContext.Provider value={authValue}>
+                    <NotesProvider>{children}</NotesProvider>
+                </AuthContext.Provider>
+            </AppThemeProvider>
+        )
+    }
+
+    beforeEach(() => {
+        mockUseLocalSearchParams.mockReturnValue({ id: "42" })
+    })
+
+    it("shows a loader while fetching a note, then renders the loaded content", async () => {
+        const deferredNote = createDeferred<{
+            data: {
+                id: number
+                created_by: string
+                title: string
+                content: string
+                created_at: string
+                updated_at: string
+                image_url: null
+                image_path: null
+                image_mime_type: null
+                image_size_bytes: null
+            } | null
+            error: null
+        }>()
+        const notesQuery = {
+            order: jest.fn(),
+            eq: jest.fn(),
+            maybeSingle: jest.fn(() => deferredNote.promise),
+        }
+
+        notesQuery.order
+            .mockImplementationOnce(() => notesQuery)
+            .mockImplementationOnce(() => Promise.resolve({ data: [], error: null }))
+        notesQuery.eq.mockReturnValue(notesQuery)
+
+        mockSupabase.from.mockImplementation((table: string) => {
+            if (table === "Notes") {
+                return {
+                    select: jest.fn(() => notesQuery),
+                }
+            }
+
+            if (table === "profiles") {
+                return {
+                    select: jest.fn(() => ({
+                        in: jest.fn(() =>
+                            Promise.resolve({
+                                data: [
+                                    {
+                                        id: "user-1",
+                                        email: "user-1@example.com",
+                                        username: null,
+                                        full_name: "Exam User",
+                                    },
+                                ],
+                                error: null,
+                            })
+                        ),
+                    })),
+                }
+            }
+
+            throw new Error(`Unexpected table requested in test: ${table}`)
+        })
+
+        render(<DetailScreen />, {
+            wrapper: TestWrapper,
+        })
+
+        await waitFor(() => {
+            expect(screen.getByTestId("note-detail-loader")).toBeTruthy()
+            expect(screen.getByText("Loading note...")).toBeTruthy()
+        })
+
+        await act(async () => {
+            deferredNote.resolve({
+                data: {
+                    id: 42,
+                    created_by: "user-1",
+                    title: "Fetched note",
+                    content: "Loaded from Supabase for the integration test",
+                    created_at: "2026-03-18T10:00:00.000Z",
+                    updated_at: "2026-03-18T10:05:00.000Z",
+                    image_url: null,
+                    image_path: null,
+                    image_mime_type: null,
+                    image_size_bytes: null,
+                },
+                error: null,
+            })
+
+            await deferredNote.promise
+        })
+
+        await waitFor(() => {
+            expect(screen.queryByTestId("note-detail-loader")).toBeNull()
+            expect(screen.getByDisplayValue("Fetched note")).toBeTruthy()
+            expect(screen.getByDisplayValue("Loaded from Supabase for the integration test")).toBeTruthy()
+        })
+    })
+})