//! Runner stream regression test hub.
//!
//! Responsibilities:
//! - Share stream-test imports across display and reader-focused coverage.
//! - Keep the root test file small while delegating behavior groups to companion files.
//!
//! Does not handle:
//! - Non-stream execution tests owned by sibling runner test modules.
//! - Production stream orchestration beyond the units exercised below.
//!
//! Assumptions/invariants:
//! - Child modules use `super::*` for the shared stream helpers and imports below.
//! - Spawn helpers remain visible to this test module via the parent `stream` unit.
use ;
use crate;
use crate;
use json;
use Cursor;
use ;
use ;