fix: support async afterEach hook

Currently a asynchronous afterEach hook will execute concurrently
with the underlying express request lifecycle. This fix allows async
hooks to complete before allowing the express request to continue
through its middleware stack.

Fixes #1241

src/dsl/verifier/proxy/hooks.ts

@@ -31,19 +31,17 @@ export const registerAfterHook = (
   config: ProxyOptions,
   stateSetupPath: string
 ): void => {
+  logger.trace("registered 'afterEach' hook");
   app.use(async (req, res, next) => {
-    if (config.afterEach !== undefined) {
-      logger.trace("registered 'afterEach' hook");
-      next();
-      if (req.path !== stateSetupPath) {
-        logger.debug("executing 'afterEach' hook");
-        try {
-          await config.afterEach();
-        } catch (e) {
-          logger.error(`error executing 'afterEach' hook: ${e.message}`);
-          logger.debug(`Stack trace was: ${e.stack}`);
-          next(new Error(`error executing 'afterEach' hook: ${e.message}`));
-        }
+    if (req.path !== stateSetupPath && config.afterEach) {
+      logger.debug("executing 'afterEach' hook");
+      try {
+        await config.afterEach();
+        next();
+      } catch (e) {
+        logger.error(`error executing 'afterEach' hook: ${e.message}`);
+        logger.debug(`Stack trace was: ${e.stack}`);
+        next(new Error(`error executing 'afterEach' hook: ${e.message}`));
       }
     } else {
       next();