Linux sandbox unit test: log BPF support

sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc

Index: sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc
diff --git a/sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc b/sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc
index ce54f875cc5d8a0dd96c13dca898c421d7bd5397..a0d86ccd783de2d64f97eddbe62825ca45787c9f 100644
--- a/sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc
+++ b/sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <ostream>
+
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
 #include "sandbox/linux/seccomp-bpf/verifier.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -15,7 +17,15 @@ const int kExpectedReturnValue = 42;
 TEST(SandboxBpf, CallSupports) {
   // We check that we don't crash, but it's ok if the kernel doesn't
   // support it.
-  Sandbox::supportsSeccompSandbox(-1);
+  bool seccomp_bpf_supported =
+      Sandbox::supportsSeccompSandbox(-1) == Sandbox::STATUS_AVAILABLE;
+  // We want to log whether or not seccomp BPF is actually supported
+  // since actual test coverage depends on it.
+  RecordProperty("SeccompBPFSupported",
+                 seccomp_bpf_supported ? "true." : "false.");
+  std::cout << "Seccomp BPF supported: "
+            << (seccomp_bpf_supported ? "true." : "false.")
+            << "\n";
 }
 
 TEST(SandboxBpf, CallSupportsTwice) {