MDL-59642 stats: Correct random unit test failure

The unit test was creating four events, and then relying on them being
retrieved in the order in which they were created.

I've modified the test to:
* ensure timecreated are spaced apart; and
* add an order by timecreated when fetching them.

diff --git a/lib/tests/statslib_test.php b/lib/tests/statslib_test.php
index 66089a4..31b99d1 100644 (file)
--- a/lib/tests/statslib_test.php
+++ b/lib/tests/statslib_test.php
@@ -337,15 +337,29 @@ class core_statslib_testcase extends advanced_testcase {
 
         $this->assertEquals($firstoldtime, stats_get_start_from('daily'));
 
+        $time = time() - 5;
         \core_tests\event\create_executed::create(array('context' => context_system::instance()))->trigger();
+        $DB->set_field('logstore_standard_log', 'timecreated', $time++, [
+                'eventname' => '\\core_tests\\event\\create_executed',
+            ]);
+
         \core_tests\event\read_executed::create(array('context' => context_system::instance()))->trigger();
+        $DB->set_field('logstore_standard_log', 'timecreated', $time++, [
+                'eventname' => '\\core_tests\\event\\read_executed',
+            ]);
+
         \core_tests\event\update_executed::create(array('context' => context_system::instance()))->trigger();
+        $DB->set_field('logstore_standard_log', 'timecreated', $time++, [
+                'eventname' => '\\core_tests\\event\\update_executed',
+            ]);
+
         \core_tests\event\delete_executed::create(array('context' => context_system::instance()))->trigger();
+        $DB->set_field('logstore_standard_log', 'timecreated', $time++, [
+                'eventname' => '\\core_tests\\event\\delete_executed',
+            ]);
 
-        // Fake the origin of events.
         $DB->set_field('logstore_standard_log', 'origin', 'web', array());
-
-        $logs = $DB->get_records('logstore_standard_log');
+        $logs = $DB->get_records('logstore_standard_log', null, 'timecreated ASC');
         $this->assertCount(4, $logs);
 
         $firstnew = reset($logs);