JS: Add Angular test case in XssThroughDom

javascript/ql/test/query-tests/Security/CWE-079/XssThroughDom/angular.ts

@@ -0,0 +1,17 @@
+import { Component } from "@angular/core";
+
+@Component({
+    template: `
+        <input type="text" (input)="setInput1($event)"></input>
+        <input type="text" (input)="setInput2($event.target)"></input>
+    `
+})
+export class Foo {
+    setInput1(event) {
+        document.write(event.target.value); // NOT OK [INCONSISTENCY]
+    }
+
+    setInput2(target) {
+        document.write(target.value); // NOT OK [INCONSISTENCY]
+    }
+}