altair-lte: obtain subscription state of SIM from registration failure code

This patch uses the extended error code after a registration failure to
determine if the SIM in the relevant modem is associated with a non-provisioned
account. It uses the standard AT+CEER command, but the implementation is
restricted to the altair plugin.

plugins/altair/tests/test-modem-helpers-altair-lte.c

@@ -0,0 +1,75 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details:
+ *
+ * Copyright (C) 2013 Google Inc.
+ *
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <glib.h>
+#include <glib-object.h>
+#include <locale.h>
+
+#include "mm-modem-helpers-altair-lte.h"
+
+/*****************************************************************************/
+/* Test +CEER responses */
+
+typedef struct {
+    const gchar *str;
+    const gchar *result;
+} CeerTest;
+
+static const CeerTest ceer_tests[] = {
+    { "", "" }, /* Special case, sometimes the response is empty, treat it as a valid response. */
+    { "+CEER:", "" },
+    { "+CEER: EPS_AND_NON_EPS_SERVICES_NOT_ALLOWED", "EPS_AND_NON_EPS_SERVICES_NOT_ALLOWED" },
+    { "+CEER: NO_SUITABLE_CELLS_IN_TRACKING_AREA", "NO_SUITABLE_CELLS_IN_TRACKING_AREA" },
+    { "WRONG RESPONSE", NULL },
+    { NULL, NULL }
+};
+
+static void
+test_ceer (void)
+{
+    guint i;
+
+    for (i = 0; ceer_tests[i].str; ++i) {
+        GError *error = NULL;
+        gchar *result;
+
+        result = mm_altair_parse_ceer_response (ceer_tests[i].str, &error);
+        if (ceer_tests[i].result) {
+            g_assert_cmpstr (ceer_tests[i].result, ==, result);
+            g_assert_no_error (error);
+            g_free (result);
+        }
+        else {
+            g_assert (result == NULL);
+            g_assert (error != NULL);
+            g_error_free (error);
+        }
+    }
+}
+
+int main (int argc, char **argv)
+{
+    setlocale (LC_ALL, "");
+
+    g_type_init ();
+    g_test_init (&argc, &argv, NULL);
+
+    g_test_add_func ("/MM/altair/ceer", test_ceer);
+
+    return g_test_run ();
+}