Re-add clang-format tests to clang/test.

Also now use -strict-whitespace as the tests are confusing otherwise.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177853 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Format/diagnostic.cpp b/test/Format/diagnostic.cpp
new file mode 100644
index 0000000..2e930ee
--- /dev/null
+++ b/test/Format/diagnostic.cpp
@@ -0,0 +1,4 @@
+// RUN: clang-format 2>&1 >/dev/null %s |FileCheck %s
+
+}
+// CHECK: diagnostic.cpp:[[@LINE-1]]:1: error: unexpected '}'