diff --git a/web/app/components/app-sidebar/snippet-info/__tests__/dropdown.spec.tsx b/web/app/components/app-sidebar/snippet-info/__tests__/dropdown.spec.tsx
new file mode 100644
index 0000000000..9907cd895a
--- /dev/null
+++ b/web/app/components/app-sidebar/snippet-info/__tests__/dropdown.spec.tsx
@@ -0,0 +1,281 @@
+import type { AppIconSelection } from '@/app/components/base/app-icon-picker'
+import type { CreateSnippetDialogPayload } from '@/app/components/workflow/create-snippet-dialog'
+import type { SnippetDetail } from '@/models/snippet'
+import { render, screen, waitFor } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import * as React from 'react'
+import SnippetInfoDropdown from '../dropdown'
+
+const mockReplace = vi.fn()
+const mockDownloadBlob = vi.fn()
+const mockToastSuccess = vi.fn()
+const mockToastError = vi.fn()
+const mockUpdateMutate = vi.fn()
+const mockExportMutateAsync = vi.fn()
+const mockDeleteMutate = vi.fn()
+let mockDropdownOpen = false
+let mockDropdownOnOpenChange: ((open: boolean) => void) | undefined
+
+vi.mock('@/next/navigation', () => ({
+  useRouter: () => ({
+    replace: mockReplace,
+  }),
+}))
+
+vi.mock('@/utils/download', () => ({
+  downloadBlob: (args: { data: Blob, fileName: string }) => mockDownloadBlob(args),
+}))
+
+vi.mock('@/app/components/base/ui/toast', () => ({
+  toast: {
+    success: (...args: unknown[]) => mockToastSuccess(...args),
+    error: (...args: unknown[]) => mockToastError(...args),
+  },
+}))
+
+vi.mock('@/app/components/base/ui/dropdown-menu', () => ({
+  DropdownMenu: ({
+    open,
+    onOpenChange,
+    children,
+  }: {
+    open?: boolean
+    onOpenChange?: (open: boolean) => void
+    children: React.ReactNode
+  }) => {
+    mockDropdownOpen = !!open
+    mockDropdownOnOpenChange = onOpenChange
+    return <div>{children}</div>
+  },
+  DropdownMenuTrigger: ({
+    children,
+    className,
+  }: {
+    children: React.ReactNode
+    className?: string
+  }) => (
+    <button
+      type="button"
+      className={className}
+      onClick={() => mockDropdownOnOpenChange?.(!mockDropdownOpen)}
+    >
+      {children}
+    </button>
+  ),
+  DropdownMenuContent: ({ children }: { children: React.ReactNode }) => (
+    mockDropdownOpen ? <div>{children}</div> : null
+  ),
+  DropdownMenuItem: ({
+    children,
+    onClick,
+  }: {
+    children: React.ReactNode
+    onClick?: () => void
+  }) => (
+    <button type="button" onClick={onClick}>
+      {children}
+    </button>
+  ),
+  DropdownMenuSeparator: () => <hr />,
+}))
+
+vi.mock('@/service/use-snippets', () => ({
+  useUpdateSnippetMutation: () => ({
+    mutate: mockUpdateMutate,
+    isPending: false,
+  }),
+  useExportSnippetMutation: () => ({
+    mutateAsync: mockExportMutateAsync,
+    isPending: false,
+  }),
+  useDeleteSnippetMutation: () => ({
+    mutate: mockDeleteMutate,
+    isPending: false,
+  }),
+}))
+
+type MockCreateSnippetDialogProps = {
+  isOpen: boolean
+  title?: string
+  confirmText?: string
+  initialValue?: {
+    name?: string
+    description?: string
+    icon?: AppIconSelection
+  }
+  onClose: () => void
+  onConfirm: (payload: CreateSnippetDialogPayload) => void
+}
+
+vi.mock('@/app/components/workflow/create-snippet-dialog', () => ({
+  default: ({
+    isOpen,
+    title,
+    confirmText,
+    initialValue,
+    onClose,
+    onConfirm,
+  }: MockCreateSnippetDialogProps) => {
+    if (!isOpen)
+      return null
+
+    return (
+      <div data-testid="create-snippet-dialog">
+        <div>{title}</div>
+        <div>{confirmText}</div>
+        <div>{initialValue?.name}</div>
+        <div>{initialValue?.description}</div>
+        <button
+          type="button"
+          onClick={() => onConfirm({
+            name: 'Updated snippet',
+            description: 'Updated description',
+            icon: {
+              type: 'emoji',
+              icon: '✨',
+              background: '#FFFFFF',
+            },
+            selectedNodeIds: [],
+          })}
+        >
+          submit-edit
+        </button>
+        <button type="button" onClick={onClose}>close-edit</button>
+      </div>
+    )
+  },
+}))
+
+const mockSnippet: SnippetDetail = {
+  id: 'snippet-1',
+  name: 'Social Media Repurposer',
+  description: 'Turn one blog post into multiple social media variations.',
+  author: 'Dify',
+  updatedAt: '2026-03-25 10:00',
+  usage: '12',
+  icon: '🤖',
+  iconBackground: '#F0FDF9',
+  status: undefined,
+}
+
+describe('SnippetInfoDropdown', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    mockDropdownOpen = false
+    mockDropdownOnOpenChange = undefined
+  })
+
+  // Rendering coverage for the menu trigger itself.
+  describe('Rendering', () => {
+    it('should render the dropdown trigger button', () => {
+      render(<SnippetInfoDropdown snippet={mockSnippet} />)
+
+      expect(screen.getByRole('button')).toBeInTheDocument()
+    })
+  })
+
+  // Edit flow should seed the dialog with current snippet info and submit updates.
+  describe('Edit Snippet', () => {
+    it('should open the edit dialog and submit snippet updates', async () => {
+      const user = userEvent.setup()
+      mockUpdateMutate.mockImplementation((_variables: unknown, options?: { onSuccess?: () => void }) => {
+        options?.onSuccess?.()
+      })
+
+      render(<SnippetInfoDropdown snippet={mockSnippet} />)
+      await user.click(screen.getByRole('button'))
+      await user.click(screen.getByText('snippet.menu.editInfo'))
+
+      expect(screen.getByTestId('create-snippet-dialog')).toBeInTheDocument()
+      expect(screen.getByText('snippet.editDialogTitle')).toBeInTheDocument()
+      expect(screen.getByText('common.operation.save')).toBeInTheDocument()
+      expect(screen.getByText(mockSnippet.name)).toBeInTheDocument()
+      expect(screen.getByText(mockSnippet.description)).toBeInTheDocument()
+
+      await user.click(screen.getByRole('button', { name: 'submit-edit' }))
+
+      expect(mockUpdateMutate).toHaveBeenCalledWith({
+        params: { snippetId: mockSnippet.id },
+        body: {
+          name: 'Updated snippet',
+          description: 'Updated description',
+          icon_info: {
+            icon: '✨',
+            icon_type: 'emoji',
+            icon_background: '#FFFFFF',
+            icon_url: undefined,
+          },
+        },
+      }, expect.objectContaining({
+        onSuccess: expect.any(Function),
+        onError: expect.any(Function),
+      }))
+      expect(mockToastSuccess).toHaveBeenCalledWith('snippet.editDone')
+    })
+  })
+
+  // Export should call the export hook and download the returned YAML blob.
+  describe('Export Snippet', () => {
+    it('should export and download the snippet yaml', async () => {
+      const user = userEvent.setup()
+      mockExportMutateAsync.mockResolvedValue('yaml: content')
+
+      render(<SnippetInfoDropdown snippet={mockSnippet} />)
+
+      await user.click(screen.getByRole('button'))
+      await user.click(screen.getByText('snippet.menu.exportSnippet'))
+
+      await waitFor(() => {
+        expect(mockExportMutateAsync).toHaveBeenCalledWith({ snippetId: mockSnippet.id })
+      })
+
+      expect(mockDownloadBlob).toHaveBeenCalledWith({
+        data: expect.any(Blob),
+        fileName: `${mockSnippet.name}.yml`,
+      })
+    })
+
+    it('should show an error toast when export fails', async () => {
+      const user = userEvent.setup()
+      mockExportMutateAsync.mockRejectedValue(new Error('export failed'))
+
+      render(<SnippetInfoDropdown snippet={mockSnippet} />)
+
+      await user.click(screen.getByRole('button'))
+      await user.click(screen.getByText('snippet.menu.exportSnippet'))
+
+      await waitFor(() => {
+        expect(mockToastError).toHaveBeenCalledWith('snippet.exportFailed')
+      })
+    })
+  })
+
+  // Delete should require confirmation and redirect after a successful mutation.
+  describe('Delete Snippet', () => {
+    it('should confirm deletion and redirect to the snippets list', async () => {
+      const user = userEvent.setup()
+      mockDeleteMutate.mockImplementation((_variables: unknown, options?: { onSuccess?: () => void }) => {
+        options?.onSuccess?.()
+      })
+
+      render(<SnippetInfoDropdown snippet={mockSnippet} />)
+
+      await user.click(screen.getByRole('button'))
+      await user.click(screen.getByText('snippet.menu.deleteSnippet'))
+
+      expect(screen.getByText('snippet.deleteConfirmTitle')).toBeInTheDocument()
+      expect(screen.getByText('snippet.deleteConfirmContent')).toBeInTheDocument()
+
+      await user.click(screen.getByRole('button', { name: 'snippet.menu.deleteSnippet' }))
+
+      expect(mockDeleteMutate).toHaveBeenCalledWith({
+        params: { snippetId: mockSnippet.id },
+      }, expect.objectContaining({
+        onSuccess: expect.any(Function),
+        onError: expect.any(Function),
+      }))
+      expect(mockToastSuccess).toHaveBeenCalledWith('snippet.deleted')
+      expect(mockReplace).toHaveBeenCalledWith('/snippets')
+    })
+  })
+})
diff --git a/web/app/components/app-sidebar/snippet-info/__tests__/index.spec.tsx b/web/app/components/app-sidebar/snippet-info/__tests__/index.spec.tsx
new file mode 100644
index 0000000000..50754ffd23
--- /dev/null
+++ b/web/app/components/app-sidebar/snippet-info/__tests__/index.spec.tsx
@@ -0,0 +1,62 @@
+import type { SnippetDetail } from '@/models/snippet'
+import { render, screen } from '@testing-library/react'
+import * as React from 'react'
+import SnippetInfo from '..'
+
+vi.mock('../dropdown', () => ({
+  default: () => <div data-testid="snippet-info-dropdown" />,
+}))
+
+const mockSnippet: SnippetDetail = {
+  id: 'snippet-1',
+  name: 'Social Media Repurposer',
+  description: 'Turn one blog post into multiple social media variations.',
+  author: 'Dify',
+  updatedAt: '2026-03-25 10:00',
+  usage: '12',
+  icon: '🤖',
+  iconBackground: '#F0FDF9',
+  status: undefined,
+}
+
+describe('SnippetInfo', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  // Rendering tests for the collapsed and expanded sidebar header states.
+  describe('Rendering', () => {
+    it('should render the expanded snippet details and dropdown when expand is true', () => {
+      render(<SnippetInfo expand={true} snippet={mockSnippet} />)
+
+      expect(screen.getByText(mockSnippet.name)).toBeInTheDocument()
+      expect(screen.getByText('snippet.typeLabel')).toBeInTheDocument()
+      expect(screen.getByText(mockSnippet.description)).toBeInTheDocument()
+      expect(screen.getByTestId('snippet-info-dropdown')).toBeInTheDocument()
+    })
+
+    it('should hide the expanded-only content when expand is false', () => {
+      render(<SnippetInfo expand={false} snippet={mockSnippet} />)
+
+      expect(screen.queryByText(mockSnippet.name)).not.toBeInTheDocument()
+      expect(screen.queryByText('snippet.typeLabel')).not.toBeInTheDocument()
+      expect(screen.queryByText(mockSnippet.description)).not.toBeInTheDocument()
+      expect(screen.queryByTestId('snippet-info-dropdown')).not.toBeInTheDocument()
+    })
+  })
+
+  // Edge cases around optional snippet fields should not break the header layout.
+  describe('Edge Cases', () => {
+    it('should omit the description block when the snippet has no description', () => {
+      render(
+        <SnippetInfo
+          expand={true}
+          snippet={{ ...mockSnippet, description: '' }}
+        />,
+      )
+
+      expect(screen.getByText(mockSnippet.name)).toBeInTheDocument()
+      expect(screen.queryByText(mockSnippet.description)).not.toBeInTheDocument()
+    })
+  })
+})