Enhance await test cases

Author: kateinoigakukun

packages/npm-packages/ruby-wasm-wasi/test/unit/test_async.rb

@@ -5,6 +5,8 @@ class JS::TestAsync < Test::Unit::TestCase
   def test_await_promise_resolve
     promise = JS.eval("return Promise.resolve(42)")
     assert_equal 42, promise.await.to_i
+    # Promise can be resolved multiple times.
+    assert_equal 42, promise.await.to_i
   end
 
   def test_await_promise_reject
@@ -21,4 +23,23 @@ def test_await_promise_chained
   def test_await_non_promise
     assert_equal 42, JS.eval("return 42").await.to_i
   end
+
+  def make_promise_and_continuation
+    JS.eval(<<~JS)
+      let continuation = null;
+      const promise = new Promise((resolve, reject) => {
+        continuation = { resolve, reject };
+      });
+      return { promise, continuation };
+    JS
+  end
+
+  def test_concurrent_promises
+    pac0 = make_promise_and_continuation
+    pac1 = make_promise_and_continuation
+    pac0[:continuation].resolve(42)
+    pac1[:continuation].resolve(43)
+    assert_equal 43, pac1[:promise].await.to_i
+    assert_equal 42, pac0[:promise].await.to_i
+  end
 end

packages/npm-packages/ruby-wasm-wasi/test/vm.test.ts

@@ -220,4 +220,10 @@ eval:11:in \`<main>'`);
     const ret1 = await vm.evalAsync(`JS.global[:Promise].resolve(43).await`);
     expect(ret1.toString()).toBe("43");
   });
+
+  test("await outside of evalAsync", async () => {
+    const vm = await initRubyVM();
+    const result = vm.eval(`require "js"; JS.global[:Promise].resolve(42).await`);
+    expect(result.call("nil?").toString()).toBe("true");
+  });
 });