Added test case for axios.interceptors.request

Author: Napalys

javascript/ql/test/experimental/Security/CWE-918/interceptors.js

@@ -0,0 +1,22 @@
+const express = require("express");
+const axios = require("axios");
+
+const app = express();
+
+let userProvidedUrl = "";
+
+axios.interceptors.request.use(
+    function (config) {
+        if (userProvidedUrl) {
+            config.url = userProvidedUrl; // SSRF -- not flagged
+        }
+        return config;
+    },
+    error => error
+);
+
+app.post("/fetch", (req, res) => {
+    const { url } = req.body;
+    userProvidedUrl = url; 
+    axios.get("placeholder");
+});