clang-format: Explicitly set fallback style that is tested.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@196213 91177308-0d34-0410-b5e6-96231b3b80d8

test/Format/style-on-command-line.cpp

 // RUN: grep -Ev "// *[A-Z0-9_]+:" %s > %t.cpp
 // RUN: clang-format -style="{BasedOnStyle: Google, IndentWidth: 8}" %t.cpp | FileCheck -strict-whitespace -check-prefix=CHECK1 %s
 // RUN: clang-format -style="{BasedOnStyle: LLVM, IndentWidth: 7}" %t.cpp | FileCheck -strict-whitespace -check-prefix=CHECK2 %s
-// RUN: clang-format -style="{BasedOnStyle: invalid, IndentWidth: 7}" %t.cpp 2>&1 | FileCheck -strict-whitespace -check-prefix=CHECK3 %s
-// RUN: clang-format -style="{lsjd}" %t.cpp 2>&1 | FileCheck -strict-whitespace -check-prefix=CHECK4 %s
+// RUN: clang-format -style="{BasedOnStyle: invalid, IndentWidth: 7}" -fallback-style=LLVM %t.cpp 2>&1 | FileCheck -strict-whitespace -check-prefix=CHECK3 %s
+// RUN: clang-format -style="{lsjd}" %t.cpp -fallback-style=LLVM 2>&1 | FileCheck -strict-whitespace -check-prefix=CHECK4 %s
 // RUN: [ ! -e %T/.clang-format ] || rm %T/.clang-format
 // RUN: printf "BasedOnStyle: google\nIndentWidth: 5\n" > %T/.clang-format
 // RUN: clang-format -style=file %t.cpp 2>&1 | FileCheck -strict-whitespace -check-prefix=CHECK5 %s