Attempt at fixing the tests on CI

src/session.ts

@@ -62,8 +62,6 @@ export class DebugSession implements IDebugger.ISession {
     }
 
     this._connection.iopubMessage.connect(this._handleEvent, this);
-
-    this._ready = this.connection.kernel.info;
   }
 
   /**
@@ -96,7 +94,7 @@ export class DebugSession implements IDebugger.ISession {
    * Start a new debug session
    */
   async start(): Promise<void> {
-    await this._ready;
+    await this._ready();
     await this.sendRequest('initialize', {
       clientID: 'jupyterlab',
       clientName: 'JupyterLab',
@@ -119,7 +117,7 @@ export class DebugSession implements IDebugger.ISession {
    * Stop the running debug session.
    */
   async stop(): Promise<void> {
-    await this._ready;
+    await this._ready();
     await this.sendRequest('disconnect', {
       restart: false,
       terminateDebuggee: true
@@ -131,7 +129,7 @@ export class DebugSession implements IDebugger.ISession {
    * Restore the state of a debug session.
    */
   async restoreState(): Promise<IDebugger.ISession.Response['debugInfo']> {
-    await this._ready;
+    await this._ready();
     const message = await this.sendRequest('debugInfo', {});
     this._isStarted = message.body.isStarted;
     return message;
@@ -146,7 +144,7 @@ export class DebugSession implements IDebugger.ISession {
     command: K,
     args: IDebugger.ISession.Request[K]
   ): Promise<IDebugger.ISession.Response[K]> {
-    await this._ready;
+    await this._ready();
     const message = await this._sendDebugMessage({
       type: 'request',
       seq: this._seq++,
@@ -195,9 +193,15 @@ export class DebugSession implements IDebugger.ISession {
     return reply.promise;
   }
 
+  /**
+   * A promise that resolves when the kernel is ready.
+   */
+  private _ready() {
+    return this._connection?.kernel?.info;
+  }
+
   private _seq = 0;
   private _connection: Session.ISessionConnection;
-  private _ready: Promise<KernelMessage.IInfoReply>;
   private _isDisposed = false;
   private _isStarted = false;
   private _disposed = new Signal<this, void>(this);

tests/src/session.spec.ts

@@ -27,6 +27,7 @@ describe('DebugSession', () => {
       }
     });
     await sessionContext.initialize();
+    await sessionContext.ready;
     await sessionContext.session?.kernel?.info;
   });