Bound every slog line against client-chosen text (closes #176)

internal/middleware/middleware_test.go

@@ -57,7 +57,21 @@ func testMiddlewareWithSessionClock(
 		SessionIdleTimeout: idleTimeout,
 	}
 
-	// Create a real session manager with a known key
+	sessManager := newTestSessionManager(cfg, log, clock)
+
+	m := middleware.NewForTest(log, cfg, sessManager)
+
+	return m, sessManager, clock
+}
+
+// newTestSessionManager builds the real session.Session the
+// middleware tests run against: an in-memory cookie store with a
+// known key, and optionally a manually advanced clock.
+func newTestSessionManager(
+	cfg *config.Config,
+	log *slog.Logger,
+	clock *fakeClock,
+) *session.Session {
 	key := make([]byte, testKeySize)
 
 	for i := range key {
@@ -79,11 +93,7 @@ func testMiddlewareWithSessionClock(
 		now = clock.Now
 	}
 
-	sessManager := session.NewForTest(store, cfg, log, key, now)
-
-	m := middleware.NewForTest(log, cfg, sessManager)
-
-	return m, sessManager, clock
+	return session.NewForTest(store, cfg, log, key, now)
 }
 
 // fakeClock is a manually advanced clock, so session expiry can be