Added additional test

Author: rbuckton

tests/baselines/reference/asyncArrowInClassES5.js

@@ -0,0 +1,21 @@
+//// [asyncArrowInClassES5.ts]
+// https://github.com/Microsoft/TypeScript/issues/16924
+// Should capture `this`
+
+class Test {
+    static member = async (x: string) => { };
+}
+
+
+//// [asyncArrowInClassES5.js]
+// https://github.com/Microsoft/TypeScript/issues/16924
+// Should capture `this`
+var _this = this;
+var Test = /** @class */ (function () {
+    function Test() {
+    }
+    Test.member = function (x) { return __awaiter(_this, void 0, void 0, function () { return __generator(this, function (_a) {
+        return [2 /*return*/];
+    }); }); };
+    return Test;
+}());

tests/baselines/reference/asyncArrowInClassES5.symbols

@@ -0,0 +1,12 @@
+=== tests/cases/compiler/asyncArrowInClassES5.ts ===
+// https://github.com/Microsoft/TypeScript/issues/16924
+// Should capture `this`
+
+class Test {
+>Test : Symbol(Test, Decl(asyncArrowInClassES5.ts, 0, 0))
+
+    static member = async (x: string) => { };
+>member : Symbol(Test.member, Decl(asyncArrowInClassES5.ts, 3, 12))
+>x : Symbol(x, Decl(asyncArrowInClassES5.ts, 4, 27))
+}
+

tests/baselines/reference/asyncArrowInClassES5.types

@@ -0,0 +1,13 @@
+=== tests/cases/compiler/asyncArrowInClassES5.ts ===
+// https://github.com/Microsoft/TypeScript/issues/16924
+// Should capture `this`
+
+class Test {
+>Test : Test
+
+    static member = async (x: string) => { };
+>member : (x: string) => Promise<void>
+>async (x: string) => { } : (x: string) => Promise<void>
+>x : string
+}
+

tests/cases/compiler/asyncArrowInClassES5.ts

@@ -0,0 +1,9 @@
+// @noEmitHelpers: true
+// @lib: es2015
+// @target: es5
+// https://github.com/Microsoft/TypeScript/issues/16924
+// Should capture `this`
+
+class Test {
+    static member = async (x: string) => { };
+}