1 files changed, 9 insertions, 0 deletions
diff --git a/tests/core/async/async_spec.lua b/tests/core/async/async_spec.lua
index 0e881c8b..3eacd145 100644
--- a/tests/core/async/async_spec.lua
+++ b/tests/core/async/async_spec.lua
@@ -120,4 +120,13 @@ describe("async", function()
             assert.spy(fn).was_called_with(nil, 2, nil, 4, nil, nil, 7, match.is_function())
         end)
     )
+
+    it("should not accept yielding non-promise values", function()
+        local err = assert.has_error(function()
+            a.run_blocking(function()
+                coroutine.yield(1)
+            end)
+        end)
+        assert.equals("Expected Promise to have been yielded in async coroutine.", err)
+    end)
 end)