BUG Fix table_name config for test pages

code/BasicFieldsTestPage.php

@@ -36,6 +36,8 @@ use SilverStripe\Forms\HTMLReadonlyField;
 
 class BasicFieldsTestPage extends TestPage
 {
+    private static $table_name = 'BasicFieldsTestPage';
+
     private static $db = array(
         'CalendarDate' => 'Date',
         'Checkbox' => 'Boolean',

code/GridFieldTestPage.php

@@ -11,6 +11,7 @@ use SilverStripe\Forms\Form;
 
 class GridFieldTestPage extends TestPage
 {
+    private static $table_name = 'GridFieldTestPage';
 
     private static $has_one = array(
         "HasOneCompany" => "SilverStripe\\FrameworkTest\\Model\\Company",

code/RelationFieldsTestPage.php

@@ -10,6 +10,7 @@ use SilverStripe\Forms\TreeMultiselectField;
 
 class RelationFieldsTestPage extends TestPage
 {
+    private static $table_name = 'RelationFieldsTestPage';
 
     private static $has_one = array(
         "HasOneCompany" => "SilverStripe\\FrameworkTest\\Model\\Company",

code/TestFileUploadPage.php

@@ -13,6 +13,7 @@ use SilverStripe\Forms\Form;
 
 class TestFileUploadPage extends TestPage
 {
+    private static $table_name = 'TestFileUploadPage';
 }
 
 class TestFileUploadPage_Controller extends TestPage_Controller

code/TestPage.php

@@ -19,6 +19,7 @@ use SilverStripe\Security\Security;
  */
 class TestPage extends Page
 {
+    private static $table_name = 'TestPage';
 
     /**
      * We can only create subclasses of TestPage