unittests: enable rrset unit tests

src/Makefile.am

@@ -117,6 +117,8 @@ unittests_SOURCES =				\
 	tests/libknot/ztree_tests.c		\
 	tests/libknot/wire_tests.h		\
 	tests/libknot/wire_tests.c		\
+	tests/libknot/rrset_tests.c		\
+	tests/libknot/rrset_tests.h		\
 	tests/libknot/sign_tests.c		\
 	tests/libknot/sign_tests.h		\
 	tests/unittests_main.c

src/tests/unittests_main.c

@@ -75,7 +75,7 @@ int main(int argc, char *argv[])
 	        &dname_tests_api,
 	        &ztree_tests_api,
 	        &sign_tests_api,	//! Key manipulation.
-		//&rrset_tests_api,
+		&rrset_tests_api,
 
 	        NULL
 	};