tests: add initial health file tests

Author: bduranleau-nr

axiom/tests/Makefile

@@ -146,6 +146,7 @@ TESTS := \
   test_hash \
   test_hashmap \
   test_header \
+  test_health \
   test_json \
   test_labels \
   test_log_event \

axiom/tests/test_health.c

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2020 New Relic Corporation. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "nr_axiom.h"
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "util_health.h"
+#include "util_memory.h"
+
+#include "tlib_main.h"
+#include "util_syscalls.h"
+
+static void test_health(void) {
+  nr_status_t rv;
+  char* location = NULL;
+
+  nrh_set_start_time();
+
+  nr_unlink("health-bc21b5891f5e44fc9272caef924611a8.yml");
+
+  location = nrh_get_health_location("/should/not/exist");
+  tlib_pass_if_true("initialization to bad path fails", NULL == location,
+                    "location=%s", NULL == location ? "NULL" : location);
+  nr_free(location);
+
+  nrh_set_health_filename();
+
+  location = nrh_get_health_location("file://./");
+  tlib_pass_if_true("initialization to good path succeeds", NULL != location,
+                    "location=%s", NULL == location ? "NULL" : location);
+
+  rv = nrh_set_last_error(NRH_MISSING_LICENSE);
+
+  rv = nrh_write_health(location);
+  tlib_pass_if_true("health file write succeeds", NR_SUCCESS == rv, "rv=%d",
+                    (int)rv);
+
+  tlib_pass_if_exists("./health-bc21b5891f5e44fc9272caef924611a8.yml");
+
+  rv = nrh_set_last_error(NRH_MISSING_APPNAME);
+
+  rv = nrh_write_health(location);
+  tlib_pass_if_true("write_health succeeds", NR_SUCCESS == rv, "rv=%d",
+                    (int)rv);
+
+  rv = nrh_set_last_error(NRH_HEALTHY);
+
+  rv = nrh_write_health(location);
+  tlib_pass_if_true("write_health succeeds", NR_SUCCESS == rv, "rv=%d",
+                    (int)rv);
+
+  nr_free(location);
+}
+
+tlib_parallel_info_t parallel_info
+    = {.suggested_nthreads = -1, .state_size = 0};
+
+void test_main(void* p NRUNUSED) {
+  test_health();
+}