diff -u b/core/modules/system/src/Tests/Database/SchemaTest.php b/core/modules/system/src/Tests/Database/SchemaTest.php
--- b/core/modules/system/src/Tests/Database/SchemaTest.php
+++ b/core/modules/system/src/Tests/Database/SchemaTest.php
@@ -71,12 +71,14 @@
     $columns = db_query('SHOW FULL COLUMNS FROM {test_table}');
     foreach ($columns as $column) {
       if ($column->Field == 'test_field_string') {
-        $this->assertTrue($column->Collation == 'utf8_general_ci');
+        $string_check = ($column->Collation == 'utf8_general_ci');
       }
       if ($column->Field == 'test_field_string_ascii') {
-        $this->assertTrue($column->Collation == 'ascii_general_ci');
+        $string_ascii_check = ($column->Collation == 'ascii_general_ci');
       }
     }
+    $this->assertTrue(!empty($string_check), 'string field has the right collation.');
+    $this->assertTrue(!empty($string_ascii_check), 'ASCII string field has the right collation.');
 
     // An insert without a value for the column 'test_table' should fail.
     $this->assertFalse($this->tryInsert(), 'Insert without a default failed.');