Replace test escaped_characters with escape::test_escape

The test in xmlrs_reader_tests.rs actually calls `unescape` function to get resulting
strings that is matched in the test, so we just test that function instead

src/escape.rs

@@ -1850,7 +1850,10 @@ fn test_unescape() {
     assert_eq!(unchanged, Cow::Borrowed("test"));
     assert!(matches!(unchanged, Cow::Borrowed(_)));
 
-    assert_eq!(unescape("&lt;test&gt;").unwrap(), "<test>");
+    assert_eq!(
+        unescape("&lt;&amp;test&apos;&quot;&gt;").unwrap(),
+        "<&test'\">"
+    );
     assert_eq!(unescape("&#x30;").unwrap(), "0");
     assert_eq!(unescape("&#48;").unwrap(), "0");
     assert!(unescape("&foo;").is_err());

tests/xmlrs_reader_tests.rs

@@ -52,20 +52,6 @@ fn html5() {
     );
 }
 
-#[test]
-fn escaped_characters() {
-    test(
-        r#"<e attr="&quot;Hello&quot;">&apos;a&apos; &lt; &apos;&amp;&apos;</e>"#,
-        r#"
-            |StartElement(e [attr=""Hello""])
-            |Characters('a' < '&')
-            |EndElement(e)
-            |EndDocument
-        "#,
-        true,
-    )
-}
-
 #[cfg(feature = "escape-html")]
 #[test]
 fn escaped_characters_html() {