Use FileCheck instead of [

[filcab]

LGTM
Should we add -implicit-check-not={{.}} to that invocation, though? So we fail if there are more lines in the file.
(Or just add a CHECK-test-NOT: {{.}} before and after the CHECK-test)

compiler-rt/test/asan/TestCases/Posix/coverage-maybe-open-file.cc

 // FIXME: https://code.google.com/p/address-sanitizer/issues/detail?id=316
 // XFAIL: android
 //
 // RUN: %clangxx_asan -fsanitize-coverage=func %s -o %t
 // RUN: rm -rf %T/coverage-maybe-open-file
 // RUN: mkdir -p %T/coverage-maybe-open-file && cd %T/coverage-maybe-open-file
 // RUN: %env_asan_opts=coverage=1 %run %t | FileCheck %s --check-prefix=CHECK-success
 // RUN: %env_asan_opts=coverage=0 %run %t | FileCheck %s --check-prefix=CHECK-fail
-// RUN: [ "$(cat test.sancov.packed)" == "test" ]
+// RUN: FileCheck %s <  test.sancov.packed --check-prefix=CHECK-test
 // RUN: cd .. && rm -rf %T/coverage-maybe-open-file
 
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 
 #include <sanitizer/coverage_interface.h>
 
 // FIXME: the code below might not work on Windows.
 int main(int argc, char **argv) {
   int fd = __sanitizer_maybe_open_cov_file("test");
   if (fd > 0) {
     printf("SUCCESS\n");
     const char s[] = "test\n";
     write(fd, s, strlen(s));
     close(fd);
   } else {
     printf("FAIL\n");
   }
 }
 
 // CHECK-success: SUCCESS
 // CHECK-fail: FAIL
+// CHECK-test: {{^}}test{{$}}