Await session kernel a bit more uniformly in tests.

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

@@ -105,6 +105,7 @@ describe('@jupyterlab/console', () => {
       [local, foreign] = await Promise.all(sessions);
       session = await createClientSession({ path: local.path });
       await (session as ClientSession).initialize();
+      await session.kernel.ready;
     });
 
     beforeEach(() => {

tests/test-notebook/src/actions.spec.ts

@@ -42,6 +42,7 @@ describe('@jupyterlab/notebook', () => {
         kernelPreference: { name: 'ipython' }
       });
       await Promise.all([ipySession.initialize(), session.initialize()]);
+      await Promise.all([ipySession.kernel.ready, session.kernel.ready]);
     });
 
     beforeEach(() => {

tests/test-outputarea/src/widget.spec.ts

@@ -122,6 +122,7 @@ describe('outputarea/widget', () => {
       beforeEach(async () => {
         session = await createClientSession();
         await session.initialize();
+        await session.kernel.ready;
       });
 
       afterEach(async () => {
@@ -130,7 +131,6 @@ describe('outputarea/widget', () => {
       });
 
       it('should execute code on a kernel and send outputs to the model', async () => {
-        await session.kernel.ready;
         const future = session.kernel.requestExecute({ code: CODE });
         widget.future = future;
         const reply = await future.done;
@@ -141,7 +141,6 @@ describe('outputarea/widget', () => {
 
       it('should clear existing outputs', async () => {
         widget.model.fromJSON(NBTestUtils.DEFAULT_OUTPUTS);
-        await session.kernel.ready;
         const future = session.kernel.requestExecute({ code: CODE });
         widget.future = future;
         const reply = await future.done;
@@ -183,6 +182,7 @@ describe('outputarea/widget', () => {
       beforeEach(async () => {
         session = await createClientSession();
         await session.initialize();
+        await session.kernel.ready;
       });
 
       afterEach(async () => {
@@ -191,7 +191,6 @@ describe('outputarea/widget', () => {
       });
 
       it('should execute code on a kernel and send outputs to the model', async () => {
-        await session.kernel.ready;
         const reply = await OutputArea.execute(CODE, widget, session);
         expect(reply.content.execution_count).to.be.ok;
         expect(reply.content.status).to.equal('ok');
@@ -241,6 +240,7 @@ describe('outputarea/widget', () => {
           kernelPreference: { name: 'ipython' }
         });
         await ipySession.initialize();
+        await ipySession.kernel.ready;
         const promise0 = OutputArea.execute(code0, widget0, ipySession);
         const promise1 = OutputArea.execute(code1, widget1, ipySession);
         await Promise.all([promise0, promise1]);