diff --git a/app/test/OAuthDiscord.test.tsx b/app/test/OAuthDiscord.test.tsx
new file mode 100644
index 000000000..1eb53d48a
--- /dev/null
+++ b/app/test/OAuthDiscord.test.tsx
@@ -0,0 +1,303 @@
+///
+/**
+ * Tests for Discord OAuth login via OAuthProviderButton.
+ *
+ * Coverage areas:
+ * - Discord button rendering (label, icon, indigo styling)
+ * - OAuth flow in both Tauri (desktop) and web environments
+ * - Loading / disabled state management
+ * - Error handling when backend URL lookup fails
+ * - dev-mode URL construction (?responseType=json)
+ */
+import type { ComponentProps } from 'react';
+import { act, fireEvent, screen, waitFor } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { renderWithProviders } from '../src/test/test-utils';
+import OAuthProviderButton from '../src/components/oauth/OAuthProviderButton';
+import { oauthProviderConfigs } from '../src/components/oauth/providerConfigs';
+
+// ---------------------------------------------------------------------------
+// Module mocks
+// ---------------------------------------------------------------------------
+
+const { mockGetBackendUrl, mockOpenUrl, mockIsTauri } = vi.hoisted(() => ({
+ mockGetBackendUrl: vi.fn(),
+ mockOpenUrl: vi.fn(),
+ mockIsTauri: vi.fn(),
+}));
+
+vi.mock('../src/services/backendUrl', () => ({ getBackendUrl: mockGetBackendUrl }));
+vi.mock('../src/utils/openUrl', () => ({ openUrl: mockOpenUrl }));
+vi.mock('../src/utils/tauriCommands', async (importOriginal) => {
+ const actual = await importOriginal>();
+ return { ...actual, isTauri: mockIsTauri };
+});
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+const discordConfig = oauthProviderConfigs.find(p => p.id === 'discord')!;
+
+const renderDiscordButton = (props: Partial> = {}) =>
+ renderWithProviders();
+
+const clickButton = (btn: HTMLElement) => act(async () => { fireEvent.click(btn); });
+
+// ---------------------------------------------------------------------------
+// Rendering
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Discord) — rendering', () => {
+ it('shows the Discord label', () => {
+ renderDiscordButton();
+ expect(screen.getByText('Discord')).toBeInTheDocument();
+ });
+
+ it('is enabled by default', () => {
+ renderDiscordButton();
+ expect(screen.getByRole('button', { name: /discord/i })).toBeEnabled();
+ });
+
+ it('is disabled when disabled prop is true', () => {
+ renderDiscordButton({ disabled: true });
+ expect(screen.getByRole('button', { name: /discord/i })).toBeDisabled();
+ });
+
+ it('renders the Discord SVG icon', () => {
+ const { container } = renderDiscordButton();
+ expect(container.querySelector('svg')).toBeInTheDocument();
+ });
+
+ it('has indigo background styling', () => {
+ renderDiscordButton();
+ expect(screen.getByRole('button', { name: /discord/i })).toHaveClass('bg-indigo-600');
+ });
+
+ it('has white text', () => {
+ const { container } = renderDiscordButton();
+ const label = container.querySelector('span');
+ expect(label).toHaveClass('text-white');
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Web OAuth flow
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Discord) — web OAuth flow', () => {
+ const originalLocation = window.location;
+
+ beforeEach(() => {
+ mockGetBackendUrl.mockResolvedValue('http://localhost:5005');
+ mockIsTauri.mockReturnValue(false);
+ delete (window as unknown as Record).location;
+ (window as unknown as Record).location = { href: '' };
+ });
+
+ afterEach(() => {
+ (window as unknown as Record).location = originalLocation;
+ });
+
+ it('redirects to /auth/discord/login?responseType=json on click', async () => {
+ renderDiscordButton();
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+
+ await waitFor(() => {
+ expect((window.location as unknown as { href: string }).href).toBe(
+ 'http://localhost:5005/auth/discord/login?responseType=json'
+ );
+ });
+ });
+
+ it('does not call openUrl in web mode', async () => {
+ renderDiscordButton();
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+
+ await waitFor(() =>
+ expect((window.location as unknown as { href: string }).href).not.toBe('')
+ );
+ expect(mockOpenUrl).not.toHaveBeenCalled();
+ });
+
+ it('calls getBackendUrl exactly once per click', async () => {
+ renderDiscordButton();
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+
+ await waitFor(() =>
+ expect((window.location as unknown as { href: string }).href).not.toBe('')
+ );
+ expect(mockGetBackendUrl).toHaveBeenCalledTimes(1);
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Tauri OAuth flow
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Discord) — Tauri OAuth flow', () => {
+ beforeEach(() => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+ });
+
+ it('calls openUrl with /auth/discord/login?responseType=json', async () => {
+ renderDiscordButton();
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+
+ await waitFor(() => {
+ expect(mockOpenUrl).toHaveBeenCalledWith(
+ 'https://api.example.com/auth/discord/login?responseType=json'
+ );
+ });
+ });
+
+ it('does not set window.location.href in Tauri mode', async () => {
+ const originalHref = window.location.href;
+ renderDiscordButton();
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalledTimes(1));
+ expect(window.location.href).toBe(originalHref);
+ });
+
+ it('remains in loading state after openUrl resolves (awaits deep-link callback)', async () => {
+ renderDiscordButton();
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalledTimes(1));
+ expect(screen.getByText('Connecting...')).toBeInTheDocument();
+ expect(document.querySelector('.animate-spin')).toBeInTheDocument();
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Loading state
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Discord) — loading state', () => {
+ it('shows spinner and "Connecting..." while getBackendUrl is pending', async () => {
+ let resolve!: (_v: string) => void;
+ mockGetBackendUrl.mockReturnValue(new Promise(res => { resolve = res; }));
+ mockIsTauri.mockReturnValue(false);
+
+ renderDiscordButton();
+ const button = screen.getByRole('button', { name: /discord/i });
+ await clickButton(button);
+
+ await waitFor(() => expect(screen.getByText('Connecting...')).toBeInTheDocument());
+ expect(document.querySelector('.animate-spin')).toBeInTheDocument();
+ expect(button).toBeDisabled();
+
+ await act(async () => { resolve('http://localhost:5005'); });
+ });
+
+ it('ignores a second click while already loading', async () => {
+ let resolve!: (_v: string) => void;
+ mockGetBackendUrl.mockReturnValue(new Promise(res => { resolve = res; }));
+ mockIsTauri.mockReturnValue(false);
+
+ renderDiscordButton();
+ const button = screen.getByRole('button', { name: /discord/i });
+
+ await clickButton(button);
+ await waitFor(() => expect(screen.getByText('Connecting...')).toBeInTheDocument());
+
+ fireEvent.click(button);
+ expect(mockGetBackendUrl).toHaveBeenCalledTimes(1);
+
+ await act(async () => { resolve('http://localhost:5005'); });
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Error handling
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Discord) — error handling', () => {
+ beforeEach(() => {
+ mockIsTauri.mockReturnValue(false);
+ });
+
+ it('returns to enabled state after getBackendUrl throws', async () => {
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderDiscordButton();
+ const button = screen.getByRole('button', { name: /discord/i });
+ await clickButton(button);
+
+ await waitFor(() => expect(button).toBeEnabled());
+ expect(screen.getByText('Discord')).toBeInTheDocument();
+ });
+
+ it('does not redirect on getBackendUrl error (web mode)', async () => {
+ const originalLocation = window.location;
+ delete (window as unknown as Record).location;
+ (window as unknown as Record).location = { href: '' };
+
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderDiscordButton();
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+
+ await waitFor(() =>
+ expect(screen.getByRole('button', { name: /discord/i })).toBeEnabled()
+ );
+ expect((window.location as unknown as { href: string }).href).toBe('');
+
+ (window as unknown as Record).location = originalLocation;
+ });
+
+ it('does not call openUrl on getBackendUrl error (Tauri mode)', async () => {
+ mockIsTauri.mockReturnValue(true);
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderDiscordButton();
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+
+ await waitFor(() =>
+ expect(screen.getByRole('button', { name: /discord/i })).toBeEnabled()
+ );
+ expect(mockOpenUrl).not.toHaveBeenCalled();
+ });
+
+ it('is a no-op when disabled and clicked', async () => {
+ renderDiscordButton({ disabled: true });
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+ expect(mockGetBackendUrl).not.toHaveBeenCalled();
+ });
+});
+
+// ---------------------------------------------------------------------------
+// URL construction
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Discord) — URL construction', () => {
+ it('uses /auth/discord/login path (not another provider)', async () => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+
+ renderDiscordButton();
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalled());
+ expect(mockOpenUrl.mock.calls[0][0]).toContain('/auth/discord/login');
+ });
+
+ it('appends ?responseType=json in dev mode (Tauri)', async () => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+
+ renderDiscordButton();
+ await clickButton(screen.getByRole('button', { name: /discord/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalled());
+ expect(mockOpenUrl.mock.calls[0][0]).toBe(
+ 'https://api.example.com/auth/discord/login?responseType=json'
+ );
+ });
+});
diff --git a/app/test/OAuthGitHub.test.tsx b/app/test/OAuthGitHub.test.tsx
new file mode 100644
index 000000000..be7851842
--- /dev/null
+++ b/app/test/OAuthGitHub.test.tsx
@@ -0,0 +1,303 @@
+///
+/**
+ * Tests for GitHub OAuth login via OAuthProviderButton.
+ *
+ * Coverage areas:
+ * - GitHub button rendering (label, icon, dark styling)
+ * - OAuth flow in both Tauri (desktop) and web environments
+ * - Loading / disabled state management
+ * - Error handling when backend URL lookup fails
+ * - dev-mode URL construction (?responseType=json)
+ */
+import type { ComponentProps } from 'react';
+import { act, fireEvent, screen, waitFor } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { renderWithProviders } from '../src/test/test-utils';
+import OAuthProviderButton from '../src/components/oauth/OAuthProviderButton';
+import { oauthProviderConfigs } from '../src/components/oauth/providerConfigs';
+
+// ---------------------------------------------------------------------------
+// Module mocks
+// ---------------------------------------------------------------------------
+
+const { mockGetBackendUrl, mockOpenUrl, mockIsTauri } = vi.hoisted(() => ({
+ mockGetBackendUrl: vi.fn(),
+ mockOpenUrl: vi.fn(),
+ mockIsTauri: vi.fn(),
+}));
+
+vi.mock('../src/services/backendUrl', () => ({ getBackendUrl: mockGetBackendUrl }));
+vi.mock('../src/utils/openUrl', () => ({ openUrl: mockOpenUrl }));
+vi.mock('../src/utils/tauriCommands', async (importOriginal) => {
+ const actual = await importOriginal>();
+ return { ...actual, isTauri: mockIsTauri };
+});
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+const githubConfig = oauthProviderConfigs.find(p => p.id === 'github')!;
+
+const renderGitHubButton = (props: Partial> = {}) =>
+ renderWithProviders();
+
+const clickButton = (btn: HTMLElement) => act(async () => { fireEvent.click(btn); });
+
+// ---------------------------------------------------------------------------
+// Rendering
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (GitHub) — rendering', () => {
+ it('shows the GitHub label', () => {
+ renderGitHubButton();
+ expect(screen.getByText('GitHub')).toBeInTheDocument();
+ });
+
+ it('is enabled by default', () => {
+ renderGitHubButton();
+ expect(screen.getByRole('button', { name: /github/i })).toBeEnabled();
+ });
+
+ it('is disabled when disabled prop is true', () => {
+ renderGitHubButton({ disabled: true });
+ expect(screen.getByRole('button', { name: /github/i })).toBeDisabled();
+ });
+
+ it('renders the GitHub SVG icon', () => {
+ const { container } = renderGitHubButton();
+ expect(container.querySelector('svg')).toBeInTheDocument();
+ });
+
+ it('has dark background styling', () => {
+ renderGitHubButton();
+ expect(screen.getByRole('button', { name: /github/i })).toHaveClass('bg-gray-900');
+ });
+
+ it('has white text', () => {
+ const { container } = renderGitHubButton();
+ const label = container.querySelector('span');
+ expect(label).toHaveClass('text-white');
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Web OAuth flow
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (GitHub) — web OAuth flow', () => {
+ const originalLocation = window.location;
+
+ beforeEach(() => {
+ mockGetBackendUrl.mockResolvedValue('http://localhost:5005');
+ mockIsTauri.mockReturnValue(false);
+ delete (window as unknown as Record).location;
+ (window as unknown as Record).location = { href: '' };
+ });
+
+ afterEach(() => {
+ (window as unknown as Record).location = originalLocation;
+ });
+
+ it('redirects to /auth/github/login?responseType=json on click', async () => {
+ renderGitHubButton();
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+
+ await waitFor(() => {
+ expect((window.location as unknown as { href: string }).href).toBe(
+ 'http://localhost:5005/auth/github/login?responseType=json'
+ );
+ });
+ });
+
+ it('does not call openUrl in web mode', async () => {
+ renderGitHubButton();
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+
+ await waitFor(() =>
+ expect((window.location as unknown as { href: string }).href).not.toBe('')
+ );
+ expect(mockOpenUrl).not.toHaveBeenCalled();
+ });
+
+ it('calls getBackendUrl exactly once per click', async () => {
+ renderGitHubButton();
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+
+ await waitFor(() =>
+ expect((window.location as unknown as { href: string }).href).not.toBe('')
+ );
+ expect(mockGetBackendUrl).toHaveBeenCalledTimes(1);
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Tauri OAuth flow
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (GitHub) — Tauri OAuth flow', () => {
+ beforeEach(() => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+ });
+
+ it('calls openUrl with /auth/github/login?responseType=json', async () => {
+ renderGitHubButton();
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+
+ await waitFor(() => {
+ expect(mockOpenUrl).toHaveBeenCalledWith(
+ 'https://api.example.com/auth/github/login?responseType=json'
+ );
+ });
+ });
+
+ it('does not set window.location.href in Tauri mode', async () => {
+ const originalHref = window.location.href;
+ renderGitHubButton();
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalledTimes(1));
+ expect(window.location.href).toBe(originalHref);
+ });
+
+ it('remains in loading state after openUrl resolves (awaits deep-link callback)', async () => {
+ renderGitHubButton();
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalledTimes(1));
+ expect(screen.getByText('Connecting...')).toBeInTheDocument();
+ expect(document.querySelector('.animate-spin')).toBeInTheDocument();
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Loading state
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (GitHub) — loading state', () => {
+ it('shows spinner and "Connecting..." while getBackendUrl is pending', async () => {
+ let resolve!: (_v: string) => void;
+ mockGetBackendUrl.mockReturnValue(new Promise(res => { resolve = res; }));
+ mockIsTauri.mockReturnValue(false);
+
+ renderGitHubButton();
+ const button = screen.getByRole('button', { name: /github/i });
+ await clickButton(button);
+
+ await waitFor(() => expect(screen.getByText('Connecting...')).toBeInTheDocument());
+ expect(document.querySelector('.animate-spin')).toBeInTheDocument();
+ expect(button).toBeDisabled();
+
+ await act(async () => { resolve('http://localhost:5005'); });
+ });
+
+ it('ignores a second click while already loading', async () => {
+ let resolve!: (_v: string) => void;
+ mockGetBackendUrl.mockReturnValue(new Promise(res => { resolve = res; }));
+ mockIsTauri.mockReturnValue(false);
+
+ renderGitHubButton();
+ const button = screen.getByRole('button', { name: /github/i });
+
+ await clickButton(button);
+ await waitFor(() => expect(screen.getByText('Connecting...')).toBeInTheDocument());
+
+ fireEvent.click(button);
+ expect(mockGetBackendUrl).toHaveBeenCalledTimes(1);
+
+ await act(async () => { resolve('http://localhost:5005'); });
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Error handling
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (GitHub) — error handling', () => {
+ beforeEach(() => {
+ mockIsTauri.mockReturnValue(false);
+ });
+
+ it('returns to enabled state after getBackendUrl throws', async () => {
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderGitHubButton();
+ const button = screen.getByRole('button', { name: /github/i });
+ await clickButton(button);
+
+ await waitFor(() => expect(button).toBeEnabled());
+ expect(screen.getByText('GitHub')).toBeInTheDocument();
+ });
+
+ it('does not redirect on getBackendUrl error (web mode)', async () => {
+ const originalLocation = window.location;
+ delete (window as unknown as Record).location;
+ (window as unknown as Record).location = { href: '' };
+
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderGitHubButton();
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+
+ await waitFor(() =>
+ expect(screen.getByRole('button', { name: /github/i })).toBeEnabled()
+ );
+ expect((window.location as unknown as { href: string }).href).toBe('');
+
+ (window as unknown as Record).location = originalLocation;
+ });
+
+ it('does not call openUrl on getBackendUrl error (Tauri mode)', async () => {
+ mockIsTauri.mockReturnValue(true);
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderGitHubButton();
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+
+ await waitFor(() =>
+ expect(screen.getByRole('button', { name: /github/i })).toBeEnabled()
+ );
+ expect(mockOpenUrl).not.toHaveBeenCalled();
+ });
+
+ it('is a no-op when disabled and clicked', async () => {
+ renderGitHubButton({ disabled: true });
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+ expect(mockGetBackendUrl).not.toHaveBeenCalled();
+ });
+});
+
+// ---------------------------------------------------------------------------
+// URL construction — /auth/github/login path
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (GitHub) — URL construction', () => {
+ it('uses /auth/github/login path (not another provider)', async () => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+
+ renderGitHubButton();
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalled());
+ expect(mockOpenUrl.mock.calls[0][0]).toContain('/auth/github/login');
+ });
+
+ it('appends ?responseType=json in dev mode (Tauri)', async () => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+
+ renderGitHubButton();
+ await clickButton(screen.getByRole('button', { name: /github/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalled());
+ expect(mockOpenUrl.mock.calls[0][0]).toBe(
+ 'https://api.example.com/auth/github/login?responseType=json'
+ );
+ });
+});
diff --git a/app/test/OAuthLoginSection.test.tsx b/app/test/OAuthLoginSection.test.tsx
new file mode 100644
index 000000000..0f7e5b53b
--- /dev/null
+++ b/app/test/OAuthLoginSection.test.tsx
@@ -0,0 +1,396 @@
+///
+/**
+ * Tests for Google OAuth login via OAuthLoginSection and OAuthProviderButton.
+ *
+ * Coverage areas:
+ * - Section renders all providers including Google
+ * - Google button initiates OAuth in both Tauri (desktop) and web environments
+ * - Loading / disabled state management during login
+ * - Error handling when the backend URL lookup fails
+ * - dev-mode URL construction (responseType=json query param)
+ */
+import type { ComponentProps } from 'react';
+import { act, fireEvent, screen, waitFor } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { renderWithProviders } from '../src/test/test-utils';
+import OAuthLoginSection from '../src/components/oauth/OAuthLoginSection';
+import OAuthProviderButton from '../src/components/oauth/OAuthProviderButton';
+import { oauthProviderConfigs } from '../src/components/oauth/providerConfigs';
+
+// ---------------------------------------------------------------------------
+// Module mocks
+// vi.hoisted() ensures mock functions are available inside vi.mock() factories
+// (which are hoisted to the top of the file by Vitest).
+// ---------------------------------------------------------------------------
+
+const { mockGetBackendUrl, mockOpenUrl, mockIsTauri } = vi.hoisted(() => ({
+ mockGetBackendUrl: vi.fn(),
+ mockOpenUrl: vi.fn(),
+ mockIsTauri: vi.fn(),
+}));
+
+vi.mock('../src/services/backendUrl', () => ({
+ getBackendUrl: mockGetBackendUrl,
+}));
+
+vi.mock('../src/utils/openUrl', () => ({
+ openUrl: mockOpenUrl,
+}));
+
+vi.mock('../src/utils/tauriCommands', async (importOriginal) => {
+ const actual = await importOriginal>();
+ return { ...actual, isTauri: mockIsTauri };
+});
+
+// IS_DEV is set to `true` by the global setup mock of '../utils/config'
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+const googleConfig = oauthProviderConfigs.find(p => p.id === 'google')!;
+
+const renderSection = (props: Partial> = {}) =>
+ renderWithProviders();
+
+const renderGoogleButton = (props: Partial> = {}) =>
+ renderWithProviders();
+
+// act() with an async callback returns Promise, making await valid.
+const clickButton = (btn: HTMLElement) => act(async () => { fireEvent.click(btn); });
+
+// ---------------------------------------------------------------------------
+// OAuthLoginSection — rendering
+// ---------------------------------------------------------------------------
+
+describe('OAuthLoginSection', () => {
+ it('renders the "Continue with" heading', () => {
+ renderSection();
+ expect(screen.getByText('Continue with')).toBeInTheDocument();
+ });
+
+ it('renders a button for every configured OAuth provider', () => {
+ renderSection();
+ for (const provider of oauthProviderConfigs) {
+ expect(
+ screen.getByRole('button', { name: new RegExp(provider.name, 'i') })
+ ).toBeInTheDocument();
+ }
+ });
+
+ it('renders a Google login button', () => {
+ renderSection();
+ expect(screen.getByRole('button', { name: /google/i })).toBeInTheDocument();
+ });
+
+ it('renders buttons in a 2-column grid', () => {
+ const { container } = renderSection();
+ const grid = container.querySelector('.grid.grid-cols-2');
+ expect(grid).toBeInTheDocument();
+ expect(grid!.children).toHaveLength(oauthProviderConfigs.length);
+ });
+
+ it('applies extra className to the wrapper div', () => {
+ const { container } = renderSection({ className: 'mt-8' });
+ expect(container.firstChild).toHaveClass('mt-8');
+ });
+
+ it('forwards disabled prop to every provider button', () => {
+ renderSection({ disabled: true });
+ for (const btn of screen.getAllByRole('button')) {
+ expect(btn).toBeDisabled();
+ }
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Google button — initial render
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Google) — rendering', () => {
+ beforeEach(() => {
+ mockGetBackendUrl.mockResolvedValue('http://localhost:5005');
+ mockIsTauri.mockReturnValue(false);
+ });
+
+ it('shows the Google label', () => {
+ renderGoogleButton();
+ expect(screen.getByText('Google')).toBeInTheDocument();
+ });
+
+ it('is enabled by default', () => {
+ renderGoogleButton();
+ expect(screen.getByRole('button', { name: /google/i })).toBeEnabled();
+ });
+
+ it('is disabled when disabled prop is true', () => {
+ renderGoogleButton({ disabled: true });
+ expect(screen.getByRole('button', { name: /google/i })).toBeDisabled();
+ });
+
+ it('renders the Google SVG icon', () => {
+ const { container } = renderGoogleButton();
+ expect(container.querySelector('svg')).toBeInTheDocument();
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Google button — web environment OAuth flow
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Google) — web OAuth flow', () => {
+ const originalLocation = window.location;
+
+ beforeEach(() => {
+ mockGetBackendUrl.mockResolvedValue('http://localhost:5005');
+ mockIsTauri.mockReturnValue(false);
+
+ // Replace window.location so we can assert href changes
+ delete (window as unknown as Record).location;
+ (window as unknown as Record).location = { href: '' };
+ });
+
+ afterEach(() => {
+ (window as unknown as Record).location = originalLocation;
+ });
+
+ it('redirects to backend Google OAuth URL on click (web, IS_DEV=true)', async () => {
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() => {
+ expect((window.location as unknown as { href: string }).href).toBe(
+ 'http://localhost:5005/auth/google/login?responseType=json'
+ );
+ });
+ });
+
+ it('does not call openUrl (Tauri) in web mode', async () => {
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() =>
+ expect((window.location as unknown as { href: string }).href).not.toBe('')
+ );
+ expect(mockOpenUrl).not.toHaveBeenCalled();
+ });
+
+ it('calls getBackendUrl exactly once per click', async () => {
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() =>
+ expect((window.location as unknown as { href: string }).href).not.toBe('')
+ );
+ expect(mockGetBackendUrl).toHaveBeenCalledTimes(1);
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Google button — Tauri (desktop) OAuth flow
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Google) — Tauri OAuth flow', () => {
+ beforeEach(() => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+ });
+
+ it('calls openUrl with the Google OAuth URL (Tauri, IS_DEV=true)', async () => {
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() => {
+ expect(mockOpenUrl).toHaveBeenCalledWith(
+ 'https://api.example.com/auth/google/login?responseType=json'
+ );
+ });
+ });
+
+ it('does not set window.location.href in Tauri mode', async () => {
+ const originalHref = window.location.href;
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalledTimes(1));
+ expect(window.location.href).toBe(originalHref);
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Google button — loading state
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Google) — loading state', () => {
+ it('shows spinner and "Connecting..." text while login is in progress', async () => {
+ let resolveBackendUrl!: (_v: string) => void;
+ mockGetBackendUrl.mockReturnValue(
+ new Promise(res => { resolveBackendUrl = res; })
+ );
+ mockIsTauri.mockReturnValue(false);
+
+ renderGoogleButton();
+ const button = screen.getByRole('button', { name: /google/i });
+
+ await clickButton(button);
+
+ await waitFor(() => expect(screen.getByText('Connecting...')).toBeInTheDocument());
+ expect(document.querySelector('.animate-spin')).toBeInTheDocument();
+ expect(button).toBeDisabled();
+
+ // Settle the promise so React doesn't warn about state updates after unmount
+ await act(async () => { resolveBackendUrl('http://localhost:5005'); });
+ });
+
+ it('does not respond to a second click while already loading', async () => {
+ let resolveBackendUrl!: (_v: string) => void;
+ mockGetBackendUrl.mockReturnValue(
+ new Promise(res => { resolveBackendUrl = res; })
+ );
+ mockIsTauri.mockReturnValue(false);
+
+ renderGoogleButton();
+ const button = screen.getByRole('button', { name: /google/i });
+
+ await clickButton(button);
+ await waitFor(() => expect(screen.getByText('Connecting...')).toBeInTheDocument());
+
+ // Second click while loading — getBackendUrl must still be called only once
+ fireEvent.click(button);
+ expect(mockGetBackendUrl).toHaveBeenCalledTimes(1);
+
+ await act(async () => { resolveBackendUrl('http://localhost:5005'); });
+ });
+
+ it('remains in loading state after successful Tauri openUrl (awaits deep-link callback)', async () => {
+ // By design: the app calls openUrl() to open the system browser and then waits
+ // for the deep-link callback. setIsLoading(false) is only called on error, so
+ // the button intentionally stays in "Connecting..." state.
+ mockGetBackendUrl.mockResolvedValue('http://localhost:5005');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalledTimes(1));
+ expect(screen.getByText('Connecting...')).toBeInTheDocument();
+ expect(document.querySelector('.animate-spin')).toBeInTheDocument();
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Google button — error handling
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Google) — error handling', () => {
+ beforeEach(() => {
+ mockIsTauri.mockReturnValue(false);
+ });
+
+ it('returns to enabled state after getBackendUrl throws', async () => {
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderGoogleButton();
+ const button = screen.getByRole('button', { name: /google/i });
+ await clickButton(button);
+
+ await waitFor(() => expect(button).toBeEnabled());
+ expect(screen.getByText('Google')).toBeInTheDocument();
+ });
+
+ it('does not redirect when getBackendUrl throws (web mode)', async () => {
+ const originalLocation = window.location;
+ delete (window as unknown as Record).location;
+ (window as unknown as Record).location = { href: '' };
+
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() =>
+ expect(screen.getByRole('button', { name: /google/i })).toBeEnabled()
+ );
+ expect((window.location as unknown as { href: string }).href).toBe('');
+
+ (window as unknown as Record).location = originalLocation;
+ });
+
+ it('does not call openUrl when getBackendUrl throws in Tauri mode', async () => {
+ mockIsTauri.mockReturnValue(true);
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() =>
+ expect(screen.getByRole('button', { name: /google/i })).toBeEnabled()
+ );
+ expect(mockOpenUrl).not.toHaveBeenCalled();
+ });
+
+ it('is a no-op when the button is disabled and clicked', async () => {
+ renderGoogleButton({ disabled: true });
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+ expect(mockGetBackendUrl).not.toHaveBeenCalled();
+ });
+});
+
+// ---------------------------------------------------------------------------
+// URL construction — dev mode query params (IS_DEV=true via global setup mock)
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Google) — dev mode URL params', () => {
+ // The global setup.ts mocks IS_DEV=true, so these assertions run in that context.
+
+ it('appends ?responseType=json to the Google OAuth URL in dev mode (Tauri)', async () => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalled());
+ const calledUrl: string = mockOpenUrl.mock.calls[0][0];
+ expect(calledUrl).toContain('?responseType=json');
+ expect(calledUrl).toBe('https://api.example.com/auth/google/login?responseType=json');
+ });
+
+ it('appends ?responseType=json to the Google OAuth URL in dev mode (web)', async () => {
+ const originalLocation = window.location;
+ delete (window as unknown as Record).location;
+ (window as unknown as Record).location = { href: '' };
+
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(false);
+
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() =>
+ expect((window.location as unknown as { href: string }).href).not.toBe('')
+ );
+ expect((window.location as unknown as { href: string }).href).toBe(
+ 'https://api.example.com/auth/google/login?responseType=json'
+ );
+
+ (window as unknown as Record).location = originalLocation;
+ });
+
+ it('uses the /auth/google/login path (not another provider)', async () => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+
+ renderGoogleButton();
+ await clickButton(screen.getByRole('button', { name: /google/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalled());
+ const calledUrl: string = mockOpenUrl.mock.calls[0][0];
+ expect(calledUrl).toContain('/auth/google/login');
+ });
+});
diff --git a/app/test/OAuthTwitter.test.tsx b/app/test/OAuthTwitter.test.tsx
new file mode 100644
index 000000000..649d85d10
--- /dev/null
+++ b/app/test/OAuthTwitter.test.tsx
@@ -0,0 +1,303 @@
+///
+/**
+ * Tests for Twitter/X OAuth login via OAuthProviderButton.
+ *
+ * Coverage areas:
+ * - Twitter button rendering (label, icon, black/dark styling)
+ * - OAuth flow in both Tauri (desktop) and web environments
+ * - Loading / disabled state management
+ * - Error handling when backend URL lookup fails
+ * - dev-mode URL construction (?responseType=json)
+ */
+import type { ComponentProps } from 'react';
+import { act, fireEvent, screen, waitFor } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { renderWithProviders } from '../src/test/test-utils';
+import OAuthProviderButton from '../src/components/oauth/OAuthProviderButton';
+import { oauthProviderConfigs } from '../src/components/oauth/providerConfigs';
+
+// ---------------------------------------------------------------------------
+// Module mocks
+// ---------------------------------------------------------------------------
+
+const { mockGetBackendUrl, mockOpenUrl, mockIsTauri } = vi.hoisted(() => ({
+ mockGetBackendUrl: vi.fn(),
+ mockOpenUrl: vi.fn(),
+ mockIsTauri: vi.fn(),
+}));
+
+vi.mock('../src/services/backendUrl', () => ({ getBackendUrl: mockGetBackendUrl }));
+vi.mock('../src/utils/openUrl', () => ({ openUrl: mockOpenUrl }));
+vi.mock('../src/utils/tauriCommands', async (importOriginal) => {
+ const actual = await importOriginal>();
+ return { ...actual, isTauri: mockIsTauri };
+});
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+const twitterConfig = oauthProviderConfigs.find(p => p.id === 'twitter')!;
+
+const renderTwitterButton = (props: Partial> = {}) =>
+ renderWithProviders();
+
+const clickButton = (btn: HTMLElement) => act(async () => { fireEvent.click(btn); });
+
+// ---------------------------------------------------------------------------
+// Rendering
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Twitter) — rendering', () => {
+ it('shows the Twitter label', () => {
+ renderTwitterButton();
+ expect(screen.getByText('Twitter')).toBeInTheDocument();
+ });
+
+ it('is enabled by default', () => {
+ renderTwitterButton();
+ expect(screen.getByRole('button', { name: /twitter/i })).toBeEnabled();
+ });
+
+ it('is disabled when disabled prop is true', () => {
+ renderTwitterButton({ disabled: true });
+ expect(screen.getByRole('button', { name: /twitter/i })).toBeDisabled();
+ });
+
+ it('renders the Twitter SVG icon', () => {
+ const { container } = renderTwitterButton();
+ expect(container.querySelector('svg')).toBeInTheDocument();
+ });
+
+ it('has black background styling', () => {
+ renderTwitterButton();
+ expect(screen.getByRole('button', { name: /twitter/i })).toHaveClass('bg-black');
+ });
+
+ it('has white text', () => {
+ const { container } = renderTwitterButton();
+ const label = container.querySelector('span');
+ expect(label).toHaveClass('text-white');
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Web OAuth flow
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Twitter) — web OAuth flow', () => {
+ const originalLocation = window.location;
+
+ beforeEach(() => {
+ mockGetBackendUrl.mockResolvedValue('http://localhost:5005');
+ mockIsTauri.mockReturnValue(false);
+ delete (window as unknown as Record).location;
+ (window as unknown as Record).location = { href: '' };
+ });
+
+ afterEach(() => {
+ (window as unknown as Record).location = originalLocation;
+ });
+
+ it('redirects to /auth/twitter/login?responseType=json on click', async () => {
+ renderTwitterButton();
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+
+ await waitFor(() => {
+ expect((window.location as unknown as { href: string }).href).toBe(
+ 'http://localhost:5005/auth/twitter/login?responseType=json'
+ );
+ });
+ });
+
+ it('does not call openUrl in web mode', async () => {
+ renderTwitterButton();
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+
+ await waitFor(() =>
+ expect((window.location as unknown as { href: string }).href).not.toBe('')
+ );
+ expect(mockOpenUrl).not.toHaveBeenCalled();
+ });
+
+ it('calls getBackendUrl exactly once per click', async () => {
+ renderTwitterButton();
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+
+ await waitFor(() =>
+ expect((window.location as unknown as { href: string }).href).not.toBe('')
+ );
+ expect(mockGetBackendUrl).toHaveBeenCalledTimes(1);
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Tauri OAuth flow
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Twitter) — Tauri OAuth flow', () => {
+ beforeEach(() => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+ });
+
+ it('calls openUrl with /auth/twitter/login?responseType=json', async () => {
+ renderTwitterButton();
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+
+ await waitFor(() => {
+ expect(mockOpenUrl).toHaveBeenCalledWith(
+ 'https://api.example.com/auth/twitter/login?responseType=json'
+ );
+ });
+ });
+
+ it('does not set window.location.href in Tauri mode', async () => {
+ const originalHref = window.location.href;
+ renderTwitterButton();
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalledTimes(1));
+ expect(window.location.href).toBe(originalHref);
+ });
+
+ it('remains in loading state after openUrl resolves (awaits deep-link callback)', async () => {
+ renderTwitterButton();
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalledTimes(1));
+ expect(screen.getByText('Connecting...')).toBeInTheDocument();
+ expect(document.querySelector('.animate-spin')).toBeInTheDocument();
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Loading state
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Twitter) — loading state', () => {
+ it('shows spinner and "Connecting..." while getBackendUrl is pending', async () => {
+ let resolve!: (_v: string) => void;
+ mockGetBackendUrl.mockReturnValue(new Promise(res => { resolve = res; }));
+ mockIsTauri.mockReturnValue(false);
+
+ renderTwitterButton();
+ const button = screen.getByRole('button', { name: /twitter/i });
+ await clickButton(button);
+
+ await waitFor(() => expect(screen.getByText('Connecting...')).toBeInTheDocument());
+ expect(document.querySelector('.animate-spin')).toBeInTheDocument();
+ expect(button).toBeDisabled();
+
+ await act(async () => { resolve('http://localhost:5005'); });
+ });
+
+ it('ignores a second click while already loading', async () => {
+ let resolve!: (_v: string) => void;
+ mockGetBackendUrl.mockReturnValue(new Promise(res => { resolve = res; }));
+ mockIsTauri.mockReturnValue(false);
+
+ renderTwitterButton();
+ const button = screen.getByRole('button', { name: /twitter/i });
+
+ await clickButton(button);
+ await waitFor(() => expect(screen.getByText('Connecting...')).toBeInTheDocument());
+
+ fireEvent.click(button);
+ expect(mockGetBackendUrl).toHaveBeenCalledTimes(1);
+
+ await act(async () => { resolve('http://localhost:5005'); });
+ });
+});
+
+// ---------------------------------------------------------------------------
+// Error handling
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Twitter) — error handling', () => {
+ beforeEach(() => {
+ mockIsTauri.mockReturnValue(false);
+ });
+
+ it('returns to enabled state after getBackendUrl throws', async () => {
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderTwitterButton();
+ const button = screen.getByRole('button', { name: /twitter/i });
+ await clickButton(button);
+
+ await waitFor(() => expect(button).toBeEnabled());
+ expect(screen.getByText('Twitter')).toBeInTheDocument();
+ });
+
+ it('does not redirect on getBackendUrl error (web mode)', async () => {
+ const originalLocation = window.location;
+ delete (window as unknown as Record).location;
+ (window as unknown as Record).location = { href: '' };
+
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderTwitterButton();
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+
+ await waitFor(() =>
+ expect(screen.getByRole('button', { name: /twitter/i })).toBeEnabled()
+ );
+ expect((window.location as unknown as { href: string }).href).toBe('');
+
+ (window as unknown as Record).location = originalLocation;
+ });
+
+ it('does not call openUrl on getBackendUrl error (Tauri mode)', async () => {
+ mockIsTauri.mockReturnValue(true);
+ mockGetBackendUrl.mockRejectedValue(new Error('network error'));
+
+ renderTwitterButton();
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+
+ await waitFor(() =>
+ expect(screen.getByRole('button', { name: /twitter/i })).toBeEnabled()
+ );
+ expect(mockOpenUrl).not.toHaveBeenCalled();
+ });
+
+ it('is a no-op when disabled and clicked', async () => {
+ renderTwitterButton({ disabled: true });
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+ expect(mockGetBackendUrl).not.toHaveBeenCalled();
+ });
+});
+
+// ---------------------------------------------------------------------------
+// URL construction
+// ---------------------------------------------------------------------------
+
+describe('OAuthProviderButton (Twitter) — URL construction', () => {
+ it('uses /auth/twitter/login path (not another provider)', async () => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+
+ renderTwitterButton();
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalled());
+ expect(mockOpenUrl.mock.calls[0][0]).toContain('/auth/twitter/login');
+ });
+
+ it('appends ?responseType=json in dev mode (Tauri)', async () => {
+ mockGetBackendUrl.mockResolvedValue('https://api.example.com');
+ mockIsTauri.mockReturnValue(true);
+ mockOpenUrl.mockResolvedValue(undefined);
+
+ renderTwitterButton();
+ await clickButton(screen.getByRole('button', { name: /twitter/i }));
+
+ await waitFor(() => expect(mockOpenUrl).toHaveBeenCalled());
+ expect(mockOpenUrl.mock.calls[0][0]).toBe(
+ 'https://api.example.com/auth/twitter/login?responseType=json'
+ );
+ });
+});