feat(level1): ROS2 完全体 12 包 / 80 测试 / 23 文档 / 工程化 / Docker 分组

src/py_params/test/test_param_declaration.py

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+"""测试 ParamsTalker 节点构造与参数声明。"""
+from py_params.param_node import ParamsTalker
+
+
+def test_default_node_name(params_talker: ParamsTalker) -> None:
+    """默认节点名 'params_talker'。"""
+    assert params_talker.get_name() == 'params_talker'
+
+
+def test_default_publish_rate_hz(params_talker: ParamsTalker) -> None:
+    """默认 publish_rate_hz == 1.0。"""
+    assert params_talker.get_parameter('publish_rate_hz').value == 1.0
+
+
+def test_default_topic_name(params_talker: ParamsTalker) -> None:
+    """默认 topic_name == 'params_chatter'。"""
+    assert params_talker.get_parameter('topic_name').value == 'params_chatter'
+
+
+def test_default_message_prefix(params_talker: ParamsTalker) -> None:
+    """默认 message_prefix == 'Params:'。"""
+    assert params_talker.get_parameter('message_prefix').value == 'Params:'
+
+
+def test_publisher_created(params_talker: ParamsTalker) -> None:
+    """默认 topic 上有发布者。"""
+    assert params_talker.count_publishers('params_chatter') >= 1
+
+
+def test_timer_created(params_talker: ParamsTalker) -> None:
+    """定时器已创建。"""
+    assert len(params_talker.timers) >= 1
+
+
+def test_prefix_cached(params_talker: ParamsTalker) -> None:
+    """缓存前缀与参数默认值一致。"""
+    assert params_talker._prefix == 'Params:'