Update FlutterEngineTest.mm

Author: hannah-hyj

shell/platform/darwin/macos/framework/Source/FlutterEngineTest.mm

@@ -770,16 +770,15 @@ - (nonnull NSView*)createWithViewIdentifier:(int64_t)viewId arguments:(nullable
   bool announced = false;
   id engineMock = CreateMockFlutterEngine(nil);
 
-  OCMStub([engineMock announceAccessibilityMessage:[OCMArg any]
-                        withPriority:[OCMArg any]])
+  OCMStub([engineMock announceAccessibilityMessage:[OCMArg any] withPriority:[OCMArg any]])
       .andDo((^(NSInvocation* invocation) {
-        announced =true;
+        announced = true;
       }));
 
   NSData* test_message = [@"a message" dataUsingEncoding:FlutterStandardMessageCodec];
 
   [engine.binaryMessenger sendOnChannel:@"flutter/accessibility" message:test_message];
-  
+
   EXPECT_TRUE(announced);
 }