update tests

tests/DeferBackendTest.php

@@ -9,23 +9,23 @@
 
 class DeferBackendTest extends SapphireTest
 {
-    public function testWriteToHeader():void
+    public function testWriteToHeader(): void
     {
         $backend = new DeferBackend;
         $this->assertFalse($backend->writeJavascriptToBody);
     }
 
-    public function testNonce():void
+    public function testNonce(): void
     {
         $this->assertNotEmpty(CspProvider::getCspNonce());
     }
 
-    public function testProvideTemplate():void
+    public function testProvideTemplate(): void
     {
         $this->assertContains("getCspNonce", CspProvider::get_template_global_variables());
     }
 
-    public function testAddSecurityHeaders():void
+    public function testAddSecurityHeaders(): void
     {
         $res = new HTTPResponse();
         CspProvider::addSecurityHeaders($res);
@@ -34,7 +34,7 @@ public function testAddSecurityHeaders():void
         $this->assertContains('referrer-policy', $headers, "Header not found in : " . implode(", ", $headers));
     }
 
-    public function testWrapScripts():void
+    public function testWrapScripts(): void
     {
         $backend = new DeferBackend;
         $backend->customScript("var test = 'test';");