Formatter: Add a test for @selector in an ObjC method expression, which happens to work already.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172335 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/Format/FormatTest.cpp

@@ -1532,6 +1532,7 @@ TEST_F(FormatTest, FormatObjCMethodExpr) {
   verifyFormat("[self stuffWithInt:a ? [self foo:bar] : c];");
   verifyFormat("[self stuffWithInt:a ? (e ? f : g) : c];");
   verifyFormat("[cond ? obj1 : obj2 methodWithParam:param]");
+  verifyFormat("[button setAction:@selector(zoomOut:)];");
   
   verifyFormat("arr[[self indexForFoo:a]];");
   verifyFormat("throw [self errorFor:a];");