Create TemporarySubDirectory class

Create class that automatically creates and deletes a temporary
subdirectory.

The subdirectory will be located beneath the system temporary directory
(such as /tmp).

Change-Id: Id14d33b47658f144ad17c6741ec36f58492a88e2
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
diff --git a/test/meson.build b/test/meson.build
index 0b4fd20..2e13604 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -5,6 +5,7 @@
         'file_descriptor_tests.cpp',
         'nvtest.cpp',
         'temporary_file_tests.cpp',
+        'temporary_subdirectory_tests.cpp',
         dependencies: [
             gmock,
             gtest,