fix: Add missing unit test for script-src-elem.

Author: mark-unwin

tests/system/HTTP/ContentSecurityPolicyTest.php

@@ -302,6 +302,21 @@ public function testScriptSrc(): void
         $this->assertStringContainsString("script-src 'self' cdn.cloudy.com;", (string) $result);
     }
 
+    #[PreserveGlobalState(false)]
+    #[RunInSeparateProcess]
+    public function testScriptSrcElem(): void
+    {
+        $this->prepare();
+        $this->csp->addScriptSrcElem('cdn.cloudy.com');
+        $this->csp->addScriptSrcElem('them.com', true);
+        $result = $this->work();
+
+        $result = $this->getHeaderEmitted('Content-Security-Policy-Report-Only');
+        $this->assertStringContainsString('script-src-elem them.com;', (string) $result);
+        $result = $this->getHeaderEmitted('Content-Security-Policy');
+        $this->assertStringContainsString("script-src-elem 'self' cdn.cloudy.com;", (string) $result);
+    }
+
     #[PreserveGlobalState(false)]
     #[RunInSeparateProcess]
     public function testStyleSrc(): void