Fix race condition, error reporting

backend/src/api.ts

@@ -72,7 +72,6 @@ export class Session {
     this.lang = lang;
     this.logPrimitive = log;
     this.log(`Creating session, language ${this.lang}`);
-    this.setup();
   }
 
   run = async (args: string[], options?: Options) => {

backend/src/server.ts

@@ -78,7 +78,7 @@ function addWebsocket(
       );
       ws.close();
     } else {
-      new api.Session(ws, lang, console.log);
+      new api.Session(ws, lang, console.log).setup();
     }
   });
   return app;

backend/src/test-runner.ts

@@ -75,6 +75,7 @@ class Test {
         this.timedOut = true;
         this.handleUpdate();
       }, TIMEOUT_MS);
+      await session.setup();
       switch (this.type) {
         case "ensure":
           await this.testEnsure();
@@ -273,6 +274,7 @@ async function main() {
     } catch (err) {
       console.error("failed:");
       console.error(test.getLog());
+      console.error(err);
     }
   }
 }