ISTWCMS-4182: Test codepen embed block

tests/src/Functional/UwWcmsBasicTest.php

@@ -713,7 +713,7 @@ class UwWcmsBasicTest extends BrowserTestBase {
       $this->assertSession()->pageTextNotContains('Generate automatic URL alias');
       $this->assertSession()->pageTextNotContains('URL alias');
 
-      // Test Tableau block.
+      // Test specific blocks.
       switch ($block) {
         case 'CodePen':
           // Create CodePen block.
@@ -779,8 +779,8 @@ class UwWcmsBasicTest extends BrowserTestBase {
           $edit = [
             'edit-settings-label' => $this->randomString(),
             'edit-settings-block-form-field-uw-tbl-server' => 'Public',
-            'edit-settings-block-form-field-uw-tbl-site-name-0-value' => $this->randomString(),
-            'edit-settings-block-form-field-uw-tbl-tableau-name-0-value' => $this->randomString(),
+            'edit-settings-block-form-field-uw-tbl-site-name-0-value' => $this->randomMachineName(),
+            'edit-settings-block-form-field-uw-tbl-tableau-name-0-value' => $this->randomMachineName(),
             'edit-settings-block-form-field-uw-tbl-tableau-height-0-value' => rand(100, 1000),
             'edit-settings-block-form-field-uw-tbl-display-tabs' => 'Yes',
           ];