fix(a11y): guard each overwriteCommand in the accessibility wrap loop [SDK-7452]

.changeset/pr-212.md

@@ -0,0 +1,6 @@
+---
+"@wdio/browserstack-service": patch
+---
+
+- Fixed accessibility command wrapping aborting on App Automate sessions, which logged `Error in onBeforeExecute` and left the remaining commands unwrapped for auto-scanning. Applies to both the CLI and the non-CLI flow.
+- Accessibility results and summary failures now report the HTTP status, the response body and the identifiers the query used, instead of an empty result with no explanation.

packages/browserstack-service/src/accessibility-handler.ts

@@ -247,7 +247,11 @@ class _AccessibilityHandler {
             .filter((command) => command.name && command.class)
             .forEach((command) => {
                 const browser = this._browser as WebdriverIO.Browser
-                browser.overwriteCommand(command.name, this.commandWrapper.bind(this, command), command.class === 'Element')
+                try {
+                    browser.overwriteCommand(command.name, this.commandWrapper.bind(this, command), command.class === 'Element')
+                } catch (error) {
+                    BStackLogger.debug(`Exception in overwrite command ${command.name} - ${error}`)
+                }
             })
 
         PerformanceTester.end(PERFORMANCE_SDK_EVENTS.CONFIG_EVENTS.ACCESSIBILITY)

packages/browserstack-service/src/cli/modules/accessibilityModule.ts

@@ -139,16 +139,22 @@ export default class AccessibilityModule extends BaseModule {
                 return
             }
 
-            // Wrap commands if accessibility scripts are available
+            // Guard EACH overwriteCommand individually: a command the driver doesn't register just
+            // skips (logged) rather than aborting the whole wrap loop, so the commands appium DOES
+            // register (click, setValue, ...) still auto-scan on app.
             if (this.scriptInstance.commandsToWrap && this.scriptInstance.commandsToWrap.length > 0) {
                 this.scriptInstance.commandsToWrap
                     .filter((command) => command.name && command.class)
                     .forEach((command) => {
-                        browser.overwriteCommand(
-                            command.name,
-                            this.commandWrapper.bind(this, command),
-                            command.class === 'Element'
-                        )
+                        try {
+                            browser.overwriteCommand(
+                                command.name,
+                                this.commandWrapper.bind(this, command),
+                                command.class === 'Element'
+                            )
+                        } catch (wrapError) {
+                            this.logger.debug(`Skipping command wrap for ${command.name}: ${wrapError}`)
+                        }
                     })
             }
 

packages/browserstack-service/src/util.ts

@@ -660,8 +660,7 @@ export const getAppA11yResults = PerformanceTester.measureWrapper(PERFORMANCE_SD
         BStackLogger.debug(`Polling Result: ${JSON.stringify(result)}`)
         return result
     } catch (error: any) {
-        BStackLogger.error('No accessibility summary was found.')
-        BStackLogger.debug(`getAppA11yResults Failed. Error: ${error}`)
+        BStackLogger.error(`No accessibility results were found for testRunUuid=${process.env.TEST_ANALYTICS_ID} sessionId=${sessionId}. Error: ${error?.message ?? util.inspect(error, { depth: 2 })}`)
         return []
     }
 })
@@ -682,8 +681,8 @@ export const getAppA11yResultsSummary = PerformanceTester.measureWrapper(PERFORM
         const result = apiRespone?.data?.data?.summary
         BStackLogger.debug(`Polling Result: ${JSON.stringify(result)}`)
         return result
-    } catch {
-        BStackLogger.error('No accessibility summary was found.')
+    } catch (error: any) {
+        BStackLogger.error(`No accessibility summary was found for testRunUuid=${process.env.TEST_ANALYTICS_ID} sessionId=${sessionId}. Error: ${error?.message ?? util.inspect(error, { depth: 2 })}`)
         return {}
     }
 })
@@ -711,8 +710,8 @@ export const getA11yResultsSummary = PerformanceTester.measureWrapper(PERFORMANC
         await performA11yScan(isAppAutomate, browser, isBrowserStackSession, isAccessibility)
         const summaryResults: { [key: string]: any; } = await (browser as WebdriverIO.Browser).executeAsync(AccessibilityScripts.getResultsSummary as string)
         return summaryResults
-    } catch {
-        BStackLogger.error('No accessibility summary was found.')
+    } catch (error: any) {
+        BStackLogger.error(`No accessibility summary was found. Error: ${error?.message ?? util.inspect(error, { depth: 2 })}`)
         return {}
     }
 })
@@ -1785,10 +1784,20 @@ export async function pollApi(
             await new Promise((resolve) => setTimeout(resolve, elapsedTime))
             return pollApi(url, params, headers, upperLimit, startTime)
         } else if (error.response) {
+            const statusCode = error.response.statusCode
+            const body = typeof error.response.body === 'string' ? error.response.body : ''
+            let message: string | undefined
+            try {
+                message = body ? JSON.parse(body).message : undefined
+            } catch {
+                // non-JSON body; the raw-body message below carries it instead
+            }
             throw {
                 data: {},
                 headers: {},
-                message: error.response.body ? JSON.parse(error.response.body).message : 'Unknown error',
+                statusCode,
+                body,
+                message: message ?? `HTTP ${statusCode}${body ? `: ${body.slice(0, 300)}` : ''}`,
             }
         } else {
             BStackLogger.error(`Unexpected error occurred: ${error}`)

packages/browserstack-service/tests/accessibility-handler.test.ts

@@ -8,6 +8,7 @@ import logger from '@wdio/logger'
 
 import AccessibilityHandler from '../src/accessibility-handler.js'
 import * as utils from '../src/util.js'
+import accessibilityScripts from '../src/scripts/accessibility-scripts.js'
 import type { Capabilities, Options } from '@wdio/types'
 import * as bstackLogger from '../src/bstackLogger.js'
 import type { BrowserstackConfig, BrowserstackOptions } from '../src/types.js'
@@ -154,6 +155,37 @@ describe('before', () => {
         (browser as WebdriverIO.Browser).getAccessibilityResults()
         expect(getA11yResultsSpy).toBeCalledTimes(1)
     })
+
+    // The server-sent commandsToWrap list can name a command this driver never registered
+    // (Selenium-shaped entries meant for another SDK). overwriteCommand throws on those, and
+    // before() has no try/catch of its own, so an unguarded loop rejects the whole hook.
+    it('skips a command the driver did not register without aborting the wrap loop', async () => {
+        const originalCommandsToWrap = accessibilityScripts.commandsToWrap
+        try {
+            isBrowserstackSessionSpy.mockReturnValue(true)
+            isAccessibilityAutomationSessionSpy.mockReturnValue(true)
+            vi.spyOn(utils, 'validateCapsWithA11y').mockReturnValue(true)
+            accessibilityScripts.commandsToWrap = [
+                { name: 'click', class: 'Element' },
+                { name: 'startA11yScanning', class: 'HttpCommandExecutor' },
+                { name: 'addValue', class: 'Element' }
+            ] as any
+            const overwriteCommand = vi.fn((name: string) => {
+                if (name === 'startA11yScanning') {
+                    throw new Error('overwriteCommand: no command to be overwritten: ' + name)
+                }
+            });
+            (browser as any).overwriteCommand = overwriteCommand
+
+            await accessibilityHandler.before('session123')
+
+            expect(overwriteCommand).toHaveBeenCalledTimes(3)
+            expect(overwriteCommand).toHaveBeenLastCalledWith('addValue', expect.any(Function), true)
+        } finally {
+            accessibilityScripts.commandsToWrap = originalCommandsToWrap
+            delete (browser as any).overwriteCommand
+        }
+    })
 })
 
 describe('beforeScenario', () => {

packages/browserstack-service/tests/cli/modules/accessibilityModule.test.ts

@@ -85,6 +85,7 @@ import { HookState } from '../../../src/cli/states/hookState.js'
 import { TestFrameworkState } from '../../../src/cli/states/testFrameworkState.js'
 import { BrowserstackCLI } from '../../../src/cli/index.js'
 import { shouldScanTestForAccessibility, validateCapsWithA11y, validateCapsWithAppA11y } from '../../../src/util.js'
+import accessibilityScripts from '../../../src/scripts/accessibility-scripts.js'
 
 describe('AccessibilityModule', () => {
     let accessibilityModule: AccessibilityModule
@@ -265,6 +266,42 @@ describe('AccessibilityModule', () => {
 
             expect(loggerWarnSpy).toHaveBeenCalledWith('Accessibility scanning cannot be stopped from outside the test')
         })
+
+        // SDK-7452: the server-sent commandsToWrap list ends with Selenium-shaped entries
+        // (startA11yScanning/stopA11yScanning/performScan, class HttpCommandExecutor) that a
+        // WebdriverIO driver never registers. overwriteCommand throws on those names, and without a
+        // per-command guard the throw escaped the forEach and aborted onBeforeExecute.
+        it('skips a command the driver did not register without aborting the wrap loop', async () => {
+            const loggerErrorSpy = vi.spyOn(accessibilityModule.logger, 'error')
+            accessibilityModule.accessibility = true
+            accessibilityModule.isAppAccessibility = true
+            vi.mocked(validateCapsWithA11y).mockReturnValue(true)
+            vi.mocked(validateCapsWithAppA11y).mockReturnValue(true)
+
+            const originalCommandsToWrap = accessibilityScripts.commandsToWrap
+            try {
+                accessibilityScripts.commandsToWrap = [
+                    { name: 'click', class: 'Element' },
+                    { name: 'startA11yScanning', class: 'HttpCommandExecutor' },
+                    { name: 'addValue', class: 'Element' }
+                ] as any
+                mockBrowser.overwriteCommand = vi.fn((name: string) => {
+                    if (name === 'startA11yScanning') {
+                        throw new Error('overwriteCommand: no command to be overwritten: ' + name)
+                    }
+                })
+
+                await accessibilityModule.onBeforeExecute()
+
+                expect(mockBrowser.overwriteCommand).toHaveBeenCalledTimes(3)
+                expect(mockBrowser.overwriteCommand).toHaveBeenLastCalledWith('addValue', expect.any(Function), true)
+                expect(loggerErrorSpy).not.toHaveBeenCalledWith(
+                    expect.stringContaining('Error in onBeforeExecute')
+                )
+            } finally {
+                accessibilityScripts.commandsToWrap = originalCommandsToWrap
+            }
+        })
     })
 
     describe('onBeforeTest', () => {