diff --git a/core/modules/dblog/lib/Drupal/dblog/Tests/DBLogTest.php b/core/modules/dblog/lib/Drupal/dblog/Tests/DBLogTest.php
index ce02b0a..ff50891 100644
--- a/core/modules/dblog/lib/Drupal/dblog/Tests/DBLogTest.php
+++ b/core/modules/dblog/lib/Drupal/dblog/Tests/DBLogTest.php
@@ -430,7 +430,7 @@ class DBLogTest extends WebTestBase {
       $severity = WATCHDOG_EMERGENCY;
       for ($j = 0; $j < 3; $j++) {
         $types[] = $type = array(
-          'count' => mt_rand(1, 5),
+          'count' => $j + 1,
           'type' => $type_name,
           'severity' => $severity++,
         );
diff --git a/core/modules/field/lib/Drupal/field/Tests/TranslationTest.php b/core/modules/field/lib/Drupal/field/Tests/TranslationTest.php
index ce76545..283d169 100644
--- a/core/modules/field/lib/Drupal/field/Tests/TranslationTest.php
+++ b/core/modules/field/lib/Drupal/field/Tests/TranslationTest.php
@@ -135,7 +135,7 @@ class TranslationTest extends FieldTestBase {
     $options = array();
     $entities = array();
     $entity_type = 'test_entity';
-    $entity_count = mt_rand(2, 5);
+    $entity_count = 5;
     $available_langcodes = field_available_languages($this->entity_type, $this->field);
 
     for ($id = 1; $id <= $entity_count; ++$id) {
diff --git a/core/modules/system/lib/Drupal/system/Tests/Actions/LoopTest.php b/core/modules/system/lib/Drupal/system/Tests/Actions/LoopTest.php
index 97667c0..2a6ff0a 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Actions/LoopTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Actions/LoopTest.php
@@ -44,7 +44,7 @@ class LoopTest extends WebTestBase {
     // recursion level should be kept low enough to prevent the xdebug
     // infinite recursion protection mechanism from aborting the request.
     // See http://drupal.org/node/587634.
-    variable_set('actions_max_stack', mt_rand(3, 12));
+    variable_set('actions_max_stack', 7);
     $this->triggerActions();
   }