1 files changed, 169 insertions, 0 deletions
diff --git a/js/src/tests/ecma_7/AsyncFunctions/semantics.js b/js/src/tests/ecma_7/AsyncFunctions/semantics.js
new file mode 100644
index 000000000..cb2a04c3f
--- /dev/null
+++ b/js/src/tests/ecma_7/AsyncFunctions/semantics.js
@@ -0,0 +1,169 @@
+// |reftest| skip-if(!xulRuntime.shell) -- needs drainJobQueue
+var BUGNUMBER = 1185106;
+var summary = "async functions semantics";
+
+print(BUGNUMBER + ": " + summary);
+
+async function empty() {
+}
+assertEventuallyEq(empty(), undefined);
+
+async function simpleReturn() {
+  return 1;
+}
+assertEventuallyEq(simpleReturn(), 1);
+
+async function simpleAwait() {
+  var result = await 2;
+  return result;
+}
+assertEventuallyEq(simpleAwait(), 2);
+
+async function simpleAwaitAsync() {
+  var result = await simpleReturn();
+  return 2 + result;
+}
+assertEventuallyEq(simpleAwaitAsync(), 3);
+
+async function returnOtherAsync() {
+  return 1 + await simpleAwaitAsync();
+}
+assertEventuallyEq(returnOtherAsync(), 4);
+
+async function simpleThrower() {
+  throw new Error();
+}
+assertEventuallyThrows(simpleThrower(), Error);
+
+async function delegatedThrower() {
+  var val = await simpleThrower();
+  return val;
+}
+
+async function tryCatch() {
+  try {
+    await delegatedThrower();
+    return 'FAILED';
+  } catch (_) {
+    return 5;
+  }
+}
+assertEventuallyEq(tryCatch(), 5);
+
+async function tryCatchThrow() {
+  try {
+    await delegatedThrower();
+    return 'FAILED';
+  } catch (_) {
+    return delegatedThrower();
+  }
+}
+assertEventuallyThrows(tryCatchThrow(), Error);
+
+async function wellFinally() {
+  try {
+    await delegatedThrower();
+  } catch (_) {
+    return 'FAILED';
+  } finally {
+    return 6;
+  }
+}
+assertEventuallyEq(wellFinally(), 6);
+
+async function finallyMayFail() {
+  try {
+    await delegatedThrower();
+  } catch (_) {
+    return 5;
+  } finally {
+    return delegatedThrower();
+  }
+}
+assertEventuallyThrows(finallyMayFail(), Error);
+
+async function embedded() {
+  async function inner() {
+    return 7;
+  }
+  return await inner();
+}
+assertEventuallyEq(embedded(), 7);
+
+// recursion, it works!
+async function fib(n) {
+    return (n == 0 || n == 1) ? n : await fib(n - 1) + await fib(n - 2);
+}
+assertEventuallyEq(fib(6), 8);
+
+// mutual recursion
+async function isOdd(n) {
+  async function isEven(n) {
+      return n === 0 || await isOdd(n - 1);
+  }
+  return n !== 0 && await isEven(n - 1);
+}
+assertEventuallyEq(isOdd(12).then(v => v ? "oops" : 12), 12);
+
+// recursion, take three!
+var hardcoreFib = async function fib2(n) {
+  return (n == 0 || n == 1) ? n : await fib2(n - 1) + await fib2(n - 2);
+}
+assertEventuallyEq(hardcoreFib(7), 13);
+
+var asyncExpr = async function() {
+  return 10;
+}
+assertEventuallyEq(asyncExpr(), 10);
+
+var namedAsyncExpr = async function simple() {
+  return 11;
+}
+assertEventuallyEq(namedAsyncExpr(), 11);
+
+async function executionOrder() {
+  var value = 0;
+  async function first() {
+    return (value = value === 0 ? 1 : value);
+  }
+  async function second() {
+    return (value = value === 0 ? 2 : value);
+  }
+  async function third() {
+    return (value = value === 0 ? 3 : value);
+  }
+  return await first() + await second() + await third() + 6;
+}
+assertEventuallyEq(executionOrder(), 9);
+
+async function miscellaneous() {
+  if (arguments.length === 3 &&
+      arguments.callee.name === "miscellaneous")
+      return 14;
+}
+assertEventuallyEq(miscellaneous(1, 2, 3), 14);
+
+function thrower() {
+  throw 15;
+}
+
+async function defaultArgs(arg = thrower()) {
+}
+assertEventuallyEq(defaultArgs().catch(e => e), 15);
+
+let arrowAwaitExpr = async () => await 2;
+assertEventuallyEq(arrowAwaitExpr(), 2);
+
+let arrowAwaitBlock = async () => { return await 2; };
+assertEventuallyEq(arrowAwaitBlock(), 2);
+
+// Async functions are not constructible
+assertThrows(() => {
+  async function Person() {
+
+  }
+  new Person();
+}, TypeError);
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);