M5: Energy view — per-metric decimal formatting and chart auto-refresh toggle

frontend/src/pages/EnergyPage.test.tsx

@@ -1,5 +1,5 @@
 /**
- * Tests for EnergyPage (M5-T06).
+ * Tests for EnergyPage (M5-T06 + M5-polish).
  *
  * Coverage:
  * 1. Renders device list from GET /api/modbus/devices.
@@ -10,6 +10,7 @@
  * 6. Delete 409 error shows friendly hint in confirmation modal.
  * 7. Test-read button calls POST /api/modbus/devices/{uuid}/test and shows result.
  * 8. Test-read failure shows error in modal.
+ * 9. Auto-refresh switch is rendered (default on) and can be toggled.
  */
 
 import { describe, it, expect, vi, beforeEach } from 'vitest'
@@ -321,6 +322,7 @@ describe('EnergyPage — test-read', () => {
     })
 
     expect(screen.getByTestId('test-read-ok')).toBeInTheDocument()
+    // Values rendered via formatMetricValue — voltage 230.2 → "230.20"
     expect(screen.getByTestId('test-read-payload').textContent).toContain('230.2')
   })
 
@@ -345,3 +347,48 @@ describe('EnergyPage — test-read', () => {
     expect(screen.getByTestId('test-read-error').textContent).toContain('Connection timed out')
   })
 })
+
+describe('EnergyPage — auto-refresh switch', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    setupDefaultMocks()
+  })
+
+  it('renders auto-refresh switch when devices exist', async () => {
+    renderEnergy()
+
+    await waitFor(() => {
+      expect(screen.getByTestId('auto-refresh-switch')).toBeInTheDocument()
+    })
+  })
+
+  it('auto-refresh switch is checked by default (default on)', async () => {
+    renderEnergy()
+
+    await waitFor(() => {
+      expect(screen.getByTestId('auto-refresh-switch')).toBeInTheDocument()
+    })
+
+    // Mantine Switch uses role="switch" and places data-testid directly on the
+    // <input> element; query it by the testid or by role.
+    const switchInput = screen.getByRole('switch', { name: /自动刷新/i })
+    expect(switchInput).toBeChecked()
+  })
+
+  it('toggling auto-refresh switch changes its checked state', async () => {
+    renderEnergy()
+
+    await waitFor(() => {
+      expect(screen.getByTestId('auto-refresh-switch')).toBeInTheDocument()
+    })
+
+    const switchInput = screen.getByRole('switch', { name: /自动刷新/i })
+    expect(switchInput).toBeChecked()
+
+    fireEvent.click(switchInput)
+
+    await waitFor(() => {
+      expect(switchInput).not.toBeChecked()
+    })
+  })
+})