我把 serverMode 改成 true，然后在执行完 monkey 之后出现如下错误
)}, isUniversal: 0, isXcodeManaged: 0, platforms: {(
>,
>
)}, filePath: >
)}
hasInternalSupport: NO
isSupportedOS: YES
developerDiskMountError: (null)
(null)
bootArgs:
connected: yes
isWirelessEnabled: no
connectionType: direct
} (11.2.6 (15D100))
MDMCreateDeltaDirectory:1920 calling MDMDirectoryDiff with:
state->old_bundle: /var/folders/pm/cw2vmzgx4fgbr69h7zl9fx1w0000gp/C/com.apple.DeveloperTools/All/Xcode/EmbeddedAppDeltas/bc0dfc406daf17d162760c73af6a35fc/1fd2561c180fc6838fa7565de169960e965e9ec3/XCTestWDUITests-Runner.app
state->new_bundle: /Users/dengjian/Library/Developer/Xcode/DerivedData/XCTestWD-fnuhsnwpyzwltgcbbdpzwgexyhef/Build/Products/Debug-iphoneos/XCTestWDUITests-Runner.app
state->dst_bundle: /var/folders/pm/cw2vmzgx4fgbr69h7zl9fx1w0000gp/C/com.apple.DeveloperTools/All/Xcode/EmbeddedAppDeltas/XCTestWDUITests-Runner.app.MpJNkW/XCTestWDUITests-Runner.app_sparse.ipa/Payload//XCTestWDUITests-Runner.app, binaryDiff flag: FALSE
dst_ipa: /var/folders/pm/cw2vmzgx4fgbr69h7zl9fx1w0000gp/C/com.apple.DeveloperTools/All/Xcode/EmbeddedAppDeltas/XCTestWDUITests-Runner.app.MpJNkW/XCTestWDUITests-Runner.app_sparse.ipa
MDMDirectoryDiff_block_invoke:1473 calling writeDictToFile with: /var/folders/pm/cw2vmzgx4fgbr69h7zl9fx1w0000gp/C/com.apple.DeveloperTools/All/Xcode/EmbeddedAppDeltas/XCTestWDUITests-Runner.app.MpJNkW/XCTestWDUITests-Runner.app_sparse.ipa/ManifestCache.plist
writeDictToFile:1278 ==== Successfully wrote Manifest cache to /var/folders/pm/cw2vmzgx4fgbr69h7zl9fx1w0000gp/C/com.apple.DeveloperTools/All/Xcode/EmbeddedAppDeltas/XCTestWDUITests-Runner.app.MpJNkW/XCTestWDUITests-Runner.app_sparse.ipa/ManifestCache.plist
2018-04-16 15:51:17.282802+0800 XCTestWDUITests-Runner[1989:456280] +[CATransaction synchronize] called within transaction
2018-04-16 15:51:17.499111+0800 XCTestWDUITests-Runner[1989:456280] Running tests...
2018-04-16 15:51:18.797476+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding -[CAMLightingControl accessibilityLabel]
2018-04-16 15:51:18.797842+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding -[CAMLightingControl accessibilityValue]
2018-04-16 15:51:18.797943+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding -[CAMLightingControl accessibilityTraits]
2018-04-16 15:51:18.798116+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding -[CAMLightingControl isAccessibilityElement]
2018-04-16 15:51:18.798203+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding -[CAMLightingControl accessibilityIncrement]
2018-04-16 15:51:18.798277+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding -[CAMLightingControl accessibilityDecrement]
2018-04-16 15:51:18.798354+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding +[CAMLightingControl safeCategoryBaseClass]
2018-04-16 15:51:18.798614+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding -[PHAsset accessibilityLabel]
2018-04-16 15:51:18.798698+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding -[PHAsset accessibilityValue]
2018-04-16 15:51:18.798766+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding -[PHAsset accessibilityTraits]
2018-04-16 15:51:18.799456+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding -[PHAsset _accessibilitySavePhotoLabel:]
2018-04-16 15:51:18.799583+0800 XCTestWDUITests-Runner[1989:456280] [AXValidations] UIAccessibility Error adding +[PHAsset safeCategoryBaseClass]
2018-04-16 15:51:18.841197+0800 XCTestWDUITests-Runner[1989:456280] Continuing to run tests in the background with task ID 1

Restarting after unexpected exit or crash in XCTextWDRunner/testRunner(); summary will include totals from previous launches.

Test Suite 'Selected tests' started at 2018-04-16 15:51:19.698
Test Suite 'XCTestWDUITests.xctest' started at 2018-04-16 15:51:19.701
Test Suite 'XCTestWDUITests.xctest' failed at 2018-04-16 15:51:19.702.
Executed 1 test, with 1 failure (0 unexpected) in 0.000 (0.001) seconds
Test Suite 'Selected tests' failed at 2018-04-16 15:51:19.704.
Executed 1 test, with 1 failure (0 unexpected) in 0.000 (0.006) seconds
** TEST FAILED **