Change test_evalute_Cookies to compare against set cookies

Issue
#2804
uncovers some weirdness of the test - set the cookie and verify it's not
set after that, this simply doesn't make sense. Changed to test for the
values being actually set.

Author: akurtakov

tests/org.eclipse.swt.tests/JUnit Tests/org/eclipse/swt/tests/junit/Test_org_eclipse_swt_browser_Browser.java

@@ -410,13 +410,17 @@ public void test_evalute_Cookies () {
 
 	// Set the cookies
 	// document.cookie behaves different from other global vars
-	browser.evaluate("document.cookie = \"cookie1=value1\";");
-	browser.evaluate("document.cookie = \"cookie2=value2\";");
+	browser.evaluate("""
+			document.cookie = "cookie1=value1";
+			""");
+	browser.evaluate("""
+			document.cookie = "cookie2=value2";
+			""");
 
 	// Retrieve entire cookie store
 	String res = (String) browser.evaluate("return document.cookie;");
 
-	assertFalse(res.isEmpty());
+	assertEquals("cookie1=value1; cookie2=value2", res);
 }
 
 @Tag("gtk4-todo")