[feat] Update history API to v2 array format and add comprehensive tests

- Migrate from object-based to array-based history response format
- Update /history endpoint to /history_v2 with max_items parameter
- Add lazy loading of workflows via /history_v2/:prompt_id endpoint
- Implement comprehensive browser tests for history API functionality
- Add unit tests for API methods and queue store
- Update TaskItemImpl to support history workflow loading
- Add proper error handling and edge case coverage
- Follow established test patterns for better maintainability

This change improves performance by reducing initial payload size
and enables on-demand workflow loading for history items.

browser_tests/tests/historyApi.spec.ts

@@ -0,0 +1,131 @@
+import {
+  comfyExpect as expect,
+  comfyPageFixture as test
+} from '../fixtures/ComfyPage'
+
+test.describe('History API v2', () => {
+  const TEST_PROMPT_ID = 'test-prompt-id'
+  const TEST_CLIENT_ID = 'test-client'
+
+  test('Can fetch history with new v2 format', async ({ comfyPage }) => {
+    // Set up mocked history with tasks
+    await comfyPage.setupHistory().withTask(['example.webp']).setupRoutes()
+
+    // Verify history_v2 API response format
+    const result = await comfyPage.page.evaluate(async () => {
+      try {
+        const response = await window['app'].api.getHistory()
+        return { success: true, data: response }
+      } catch (error) {
+        console.error('Failed to fetch history:', error)
+        return { success: false, error: error.message }
+      }
+    })
+
+    expect(result.success).toBe(true)
+    expect(result.data).toHaveProperty('History')
+    expect(Array.isArray(result.data.History)).toBe(true)
+    expect(result.data.History.length).toBeGreaterThan(0)
+
+    const historyItem = result.data.History[0]
+
+    // Verify the new prompt structure (object instead of array)
+    expect(historyItem.prompt).toHaveProperty('priority')
+    expect(historyItem.prompt).toHaveProperty('prompt_id')
+    expect(historyItem.prompt).toHaveProperty('extra_data')
+    expect(typeof historyItem.prompt.priority).toBe('number')
+    expect(typeof historyItem.prompt.prompt_id).toBe('string')
+    expect(historyItem.prompt.extra_data).toHaveProperty('client_id')
+  })
+
+  test('Can load workflow from history using history_v2 endpoint', async ({
+    comfyPage
+  }) => {
+    // Simple mock workflow for testing
+    const mockWorkflow = {
+      version: 0.4,
+      nodes: [{ id: 1, type: 'TestNode', pos: [100, 100], size: [200, 100] }],
+      links: [],
+      groups: [],
+      config: {},
+      extra: {}
+    }
+
+    // Set up history with workflow data
+    await comfyPage
+      .setupHistory()
+      .withTask(['example.webp'], 'images', {
+        prompt: {
+          priority: 0,
+          prompt_id: TEST_PROMPT_ID,
+          extra_data: {
+            client_id: TEST_CLIENT_ID,
+            extra_pnginfo: { workflow: mockWorkflow }
+          }
+        }
+      })
+      .setupRoutes()
+
+    // Load initial workflow to clear canvas
+    await comfyPage.loadWorkflow('simple_slider')
+    await comfyPage.nextFrame()
+
+    // Load workflow from history
+    const loadResult = await comfyPage.page.evaluate(async (promptId) => {
+      try {
+        const workflow =
+          await window['app'].api.getWorkflowFromHistory(promptId)
+        if (workflow) {
+          await window['app'].loadGraphData(workflow)
+          return { success: true }
+        }
+        return { success: false, error: 'No workflow found' }
+      } catch (error) {
+        console.error('Failed to load workflow from history:', error)
+        return { success: false, error: error.message }
+      }
+    }, TEST_PROMPT_ID)
+
+    expect(loadResult.success).toBe(true)
+
+    // Verify workflow loaded correctly
+    await comfyPage.nextFrame()
+    const nodeInfo = await comfyPage.page.evaluate(() => {
+      try {
+        const graph = window['app'].graph
+        return {
+          success: true,
+          nodeCount: graph.nodes?.length || 0,
+          firstNodeType: graph.nodes?.[0]?.type || null
+        }
+      } catch (error) {
+        return { success: false, error: error.message }
+      }
+    })
+
+    expect(nodeInfo.success).toBe(true)
+    expect(nodeInfo.nodeCount).toBe(1)
+    expect(nodeInfo.firstNodeType).toBe('TestNode')
+  })
+
+  test('Handles missing workflow data gracefully', async ({ comfyPage }) => {
+    // Set up empty history routes
+    await comfyPage.setupHistory().setupRoutes()
+
+    // Test loading from history with invalid prompt_id
+    const result = await comfyPage.page.evaluate(async () => {
+      try {
+        const workflow =
+          await window['app'].api.getWorkflowFromHistory('invalid-id')
+        return { success: true, workflow }
+      } catch (error) {
+        console.error('Expected error for invalid prompt_id:', error)
+        return { success: false, error: error.message }
+      }
+    })
+
+    // Should handle gracefully without throwing
+    expect(result.success).toBe(true)
+    expect(result.workflow).toBeNull()
+  })
+})

browser_tests/tests/sidebar/workflows.spec.ts

@@ -187,6 +187,7 @@ test.describe('Workflows sidebar', () => {
 
   test('Can save workflow as with same name', async ({ comfyPage }) => {
     await comfyPage.menu.topbar.saveWorkflow('workflow5.json')
+    await comfyPage.nextFrame()
     expect(await comfyPage.menu.workflowsTab.getOpenedWorkflowNames()).toEqual([
       'workflow5.json'
     ])