Language: Java
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
    public void shouldHaveErrorMessageAlongWithCustomMessageInOutputOfTemplate() {
        Map<String, Object> data = new HashMap<>();
        data.put("errorMessage", "ERROR MESSAGE");

        String output = view.render(data);
        assertThat(output, containsString("$('trans_content').update(\"Sorry, an unexpected error occurred [ERROR MESSAGE]. :( Please check the server logs for more information.\");"));
    }