Test for diagnostic using FileCheck

Author: naveen-seth

clang/test/CodeCompletion/crash-if-zero-index.cpp

@@ -1,6 +1,10 @@
-// RUN: not %clang_cc1 -fsyntax-only -code-completion-at=%s:0:1 %s -o -
-// RUN: not %clang_cc1 -fsyntax-only -code-completion-at=%s:1:0 %s -o -
-
 // Related to #139375
 // Clang uses 1-based indexing for source locations given from the command-line.
-// Verify Clang doesn’t crash when 0 is given as line or column number.
+// Verify that Clang rejects 0 as an invalid value for line or column number.
+
+// RUN: not %clang_cc1 -fsyntax-only -code-completion-at=%s:0:1 %s -o - 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-DIAG %s
+// RUN: not %clang_cc1 -fsyntax-only -code-completion-at=%s:1:0 %s -o - 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-DIAG %s
+
+// CHECK-DIAG: error: invalid value '{{.*}}' in '-code-completion-at={{.*}}'