contextOf method
The runtime context the fake holds for endUserId (from context
frames and PUT/PATCH calls), for assertions.
Implementation
Map<String, Object?> contextOf(String endUserId) =>
Map<String, Object?>.unmodifiable(
_sessions.values
.where((s) => s.endUserId == endUserId && !s.expired)
.map((s) => s.context)
.lastOrNull ??
const <String, Object?>{},
);