Add flag --require-audio-hardware-for-testing.

media/audio/audio_unittest_utils.h

Index: media/audio/audio_unittest_utils.h
diff --git a/media/audio/audio_unittest_utils.h b/media/audio/audio_unittest_utils.h
new file mode 100644
index 0000000000000000000000000000000000000000..d6e0d5d3e1bf1df4a0ed10138d499c13c62d9471
--- /dev/null
+++ b/media/audio/audio_unittest_utils.h
@@ -0,0 +1,25 @@
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "media/base/media_switches.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+// Use in tests to either skip or fail a test when the system is missing a
+// required audio device or library. If the |kRequireAudioHardwareForTesting|
+// flag is set, missing requirements will cause the test to fail. Otherwise it
+// will be skipped.
+#define CAN_RUN_AUDIO_TEST_IF(requirements_satisfied)                 \

[DaleCurtis, 2015/02/09 21:21:31]

Hmm, naming feels odd. What about something like:

ABORT_AUDIO_TEST_IF_NOT(...)

Both paths are abort, just some are hard vs soft failures, right?

[watk, 2015/02/09 22:03:57]

Much better, thanks

+  do {                                                                \
+    bool satisfied = requirements_satisfied;                          \

[DaleCurtis, 2015/02/09 21:21:31]

Most of this should be moved into a static function and only the FAIL() or
return part kept in the macro.

[watk, 2015/02/09 22:03:57]

Done.

+    bool fail_if_unsatisfied =                                        \
+        base::CommandLine::ForCurrentProcess()->HasSwitch(            \
+            switches::kRequireAudioHardwareForTesting);               \
+    const char* message =                                             \
+        "Requirement(s) not satisfied (" #requirements_satisfied ")"; \
+    if (fail_if_unsatisfied && !satisfied) {                          \
+      FAIL() << message;                                              \
+    }                                                                 \
+    if (!satisfied) {                                                 \
+      LOG(WARNING) << "Skipping test: " << message;                   \
+      return;                                                         \
+    }                                                                 \
+  } while (false)