diff --git a/src/vs/workbench/api/common/extHostExtensionService.ts b/src/vs/workbench/api/common/extHostExtensionService.ts
index f0f60cf6f7d16..99fccebaee08b 100644
--- a/src/vs/workbench/api/common/extHostExtensionService.ts
+++ b/src/vs/workbench/api/common/extHostExtensionService.ts
@@ -740,8 +740,18 @@ export abstract class AbstractExtHostExtensionService extends Disposable impleme
 		return new Promise<number>((resolve, reject) => {
 			const oldTestRunnerCallback = (error: Error, failures: number | undefined) => {
 				if (error) {
+					if (isCI) {
+						this._logService.error(`Test runner called back with error`, error);
+					}
 					reject(error);
 				} else {
+					if (isCI) {
+						if (failures) {
+							this._logService.info(`Test runner called back with ${failures} failures.`);
+						} else {
+							this._logService.info(`Test runner called back with successful outcome.`);
+						}
+					}
 					resolve((typeof failures === 'number' && failures > 0) ? 1 /* ERROR */ : 0 /* OK */);
 				}
 			};
@@ -754,9 +764,15 @@ export abstract class AbstractExtHostExtensionService extends Disposable impleme
 			if (runResult && runResult.then) {
 				runResult
 					.then(() => {
+						if (isCI) {
+							this._logService.info(`Test runner finished successfully.`);
+						}
 						resolve(0);
 					})
 					.catch((err: unknown) => {
+						if (isCI) {
+							this._logService.error(`Test runner finished with error`, err);
+						}
 						reject(err instanceof Error && err.stack ? err.stack : String(err));
 					});
 			}
diff --git a/src/vs/workbench/services/extensions/common/abstractExtensionService.ts b/src/vs/workbench/services/extensions/common/abstractExtensionService.ts
index 34184b0820619..ccb729ce206ce 100644
--- a/src/vs/workbench/services/extensions/common/abstractExtensionService.ts
+++ b/src/vs/workbench/services/extensions/common/abstractExtensionService.ts
@@ -510,7 +510,13 @@ export abstract class AbstractExtensionService extends Disposable implements IEx
 		let exitCode: number;
 		try {
 			exitCode = await extensionHostManager.extensionTestsExecute();
+			if (isCI) {
+				this._logService.info(`Extension host test runner exit code: ${exitCode}`);
+			}
 		} catch (err) {
+			if (isCI) {
+				this._logService.error(`Extension host test runner error`, err);
+			}
 			console.error(err);
 			exitCode = 1 /* ERROR */;
 		}
diff --git a/src/vs/workbench/services/extensions/electron-sandbox/nativeExtensionService.ts b/src/vs/workbench/services/extensions/electron-sandbox/nativeExtensionService.ts
index 13e18b9e611d7..d63228db9d2de 100644
--- a/src/vs/workbench/services/extensions/electron-sandbox/nativeExtensionService.ts
+++ b/src/vs/workbench/services/extensions/electron-sandbox/nativeExtensionService.ts
@@ -436,6 +436,9 @@ export class NativeExtensionService extends AbstractExtensionService implements
 
 		if (parseExtensionDevOptions(this._environmentService).isExtensionDevTestFromCli) {
 			// When CLI testing make sure to exit with proper exit code
+			if (isCI) {
+				this._logService.info(`Asking native host service to exit with code ${code}.`);
+			}
 			this._nativeHostService.exit(code);
 		} else {
 			// Expected development extension termination: When the extension host goes down we also shutdown the window