Name core tests consistently

Now, given a concept xyz,
* the main test file is called test_xyz.cc
* the executable is called test_xyz, and
* the ctest test is called text_xyz.

server/core/test/test_users.cc

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2016 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
+ *
+ * Change Date: 2020-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+
+/**
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date         Who                 Description
+ * 08-10-2014   Martin Brampton     Initial implementation
+ *
+ * @endverbatim
+ */
+
+// To ensure that ss_info_assert asserts also when builing in non-debug mode.
+#if !defined(SS_DEBUG)
+#define SS_DEBUG
+#endif
+#if defined(NDEBUG)
+#undef NDEBUG
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <maxscale/users.h>
+#include <maxscale/log_manager.h>
+
+static int test1()
+{
+    USERS* users;
+    bool rv;
+
+    /* Poll tests */
+    ss_dfprintf(stderr,
+                "testusers : Initialise the user table.");
+    users = users_alloc();
+    mxs_log_flush_sync();
+    ss_info_dassert(NULL != users, "Allocating user table should not return NULL.");
+    ss_dfprintf(stderr, "\t..done\nAdd a user");
+    rv = users_add(users, "username", "authorisation", USER_ACCOUNT_ADMIN);
+    mxs_log_flush_sync();
+    ss_info_dassert(rv, "Should add one user");
+    rv = users_auth(users, "username", "authorisation");
+    mxs_log_flush_sync();
+    ss_info_dassert(rv, "Fetch valid user must not return NULL");
+    rv = users_auth(users, "username", "newauth");
+    mxs_log_flush_sync();
+    ss_info_dassert(rv == 0, "Fetch invalid user must return NULL");
+
+    ss_dfprintf(stderr, "\t..done\nAdd another user");
+    rv = users_add(users, "username2", "authorisation2", USER_ACCOUNT_ADMIN);
+    mxs_log_flush_sync();
+    ss_info_dassert(rv, "Should add one user");
+    ss_dfprintf(stderr, "\t..done\nDelete a user.");
+    rv = users_delete(users, "username");
+    mxs_log_flush_sync();
+    ss_info_dassert(rv, "Should delete just one user");
+
+    ss_dfprintf(stderr, "\t..done\nDump users table.");
+    json_t* dump = users_to_json(users);
+    ss_info_dassert(dump, "Users should be dumped");
+    USERS* loaded_users = users_from_json(dump);
+    ss_info_dassert(dump, "Users should be loaded");
+    rv = users_auth(loaded_users, "username2", "authorisation2");
+    ss_info_dassert(rv, "Loaded users should contain users");
+
+    ss_dfprintf(stderr, "\t..done\nFree user table.");
+    users_free(users);
+    mxs_log_flush_sync();
+    ss_dfprintf(stderr, "\t..done\n");
+
+    return 0;
+
+}
+
+int main(int argc, char **argv)
+{
+    int result = 0;
+
+    result += test1();
+
+    exit(result);
+}
+