Actually await promises.

tests/test-console/src/foreign.spec.ts

@@ -208,7 +208,7 @@ describe('@jupyterlab/console', () => {
           promise.resolve(void 0);
         });
         await foreign.kernel.requestExecute({ code, stop_on_error: true }).done;
-        await promise;
+        await promise.promise;
         expect(called).to.equal(true);
       });
 
@@ -225,7 +225,7 @@ describe('@jupyterlab/console', () => {
           promise.resolve(void 0);
         });
         await foreign.kernel.requestExecute({ code, stop_on_error: true }).done;
-        await promise;
+        await promise.promise;
         expect(called).to.equal(true);
       });
 
@@ -244,7 +244,7 @@ describe('@jupyterlab/console', () => {
           }
         });
         await foreign.kernel.requestExecute({ code, stop_on_error: true }).done;
-        await promise;
+        await promise.promise;
         expect(called).to.equal(true);
       });
     });