Add missing test for r214210.

Thanks dblaikie for reminding me.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214239 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/FileCheck/validate-check-prefix.txt b/test/FileCheck/validate-check-prefix.txt
index db3392d581908e40d45b2acb304af3875735652c..6efec440d0bccab25b8ec50f96e6b7d6faa56ddb 100644 (file)
--- a/test/FileCheck/validate-check-prefix.txt
+++ b/test/FileCheck/validate-check-prefix.txt
@@ -2,6 +2,7 @@
 // RUN: FileCheck -check-prefix=A1a-B_c -input-file %s %s
 // RUN: not FileCheck -check-prefix=REPEAT -check-prefix=REPEAT -input-file %s %s 2>&1 | FileCheck -check-prefix=BAD_PREFIX %s
 // RUN: not FileCheck -check-prefix=VALID -check-prefix=A! -input-file %s %s 2>&1 | FileCheck -check-prefix=BAD_PREFIX %s
+// RUN: not FileCheck -check-prefix= -input-file %s %s 2>&1 | FileCheck -check-prefix=BAD_PREFIX %s
 foobar
 ; A1a-B_c: foobar