Add PKCS12 tests

Only regression tests for the empty password bugs for now. Further tests
will follow later.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 41dceed..909046d 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -216,6 +216,7 @@
 add_test_suite(pkcs1_v15)
 add_test_suite(pkcs1_v21)
 add_test_suite(pkcs5)
+add_test_suite(pkcs12)
 add_test_suite(pkparse)
 add_test_suite(pkwrite)
 add_test_suite(poly1305)