JS: Add test and fix bug in pipe parser

javascript/ql/test/library-tests/frameworks/Angular2/foo.component.html

@@ -0,0 +1,4 @@
+<other-component
+    [prop]="foo | bar"
+    [prop2]="foo | bar:'baz'"
+></other-component>

javascript/ql/test/library-tests/frameworks/Angular2/foo.component.ts

@@ -0,0 +1,13 @@
+import { Component } from "@angular/core";
+
+@Component({
+    selector: "foo-component",
+    templateUrl: "./foo.component.html"
+})
+export class Foo {
+    foo: string;
+
+    constructor() {
+        this.foo = "hello";
+    }
+}

javascript/ql/test/library-tests/frameworks/Angular2/test.expected

@@ -0,0 +1,10 @@
+pipeRef
+| foo.component.html:2:19:2:21 | bar |
+| foo.component.html:3:20:3:28 | bar:'baz' |
+pipeCall
+| foo.component.html:2:13:2:21 | foo \| bar |
+| foo.component.html:3:14:3:28 | foo \| bar:'baz' |
+pipeCallArg
+| 0 | foo.component.html:2:13:2:15 | foo | foo.component.html:2:13:2:21 | foo \| bar |
+| 0 | foo.component.html:3:14:3:16 | foo | foo.component.html:3:14:3:28 | foo \| bar:'baz' |
+| 1 | foo.component.html:3:24:3:28 | 'baz' | foo.component.html:3:14:3:28 | foo \| bar:'baz' |

javascript/ql/test/library-tests/frameworks/Angular2/test.ql

@@ -0,0 +1,12 @@
+import javascript
+
+query Angular2::PipeRefExpr pipeRef() { any() }
+
+query CallExpr pipeCall() {
+  result.getCallee() instanceof Angular2::PipeRefExpr
+}
+
+query CallExpr pipeCallArg(int i, Expr arg) {
+  result.getCallee() instanceof Angular2::PipeRefExpr and
+  result.getArgument(i) = arg
+}