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J. Nick Koston
45 lines
1.8 KiB
Python
45 lines
1.8 KiB
Python
"""Tests for the template text component."""
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from __future__ import annotations
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from collections.abc import Callable
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from pathlib import Path
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def test_template_text_saver_uses_placement_new_with_templated_subclass(
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generate_main: Callable[[str | Path], str],
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component_config_path: Callable[[str], Path],
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) -> None:
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"""Regression test for template text restore saver using placement new.
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When ``restore_value: true``, the saver is its own Pvariable with
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placement new: storage is sized for ``TextSaver<MAX_LENGTH>``, the
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declared pointer stays at ``TemplateTextSaverBase *`` for polymorphism,
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and the templated subclass constructor runs. A regression would either
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reintroduce the heap ``new TextSaver<...>()`` expression or size the
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storage for the base class and silently skip the subclass ctor.
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"""
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main_cpp = generate_main(component_config_path("template_text_restore.yaml"))
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# Storage is sized and aligned for the templated subclass.
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assert "sizeof(template_::TextSaver<10>)" in main_cpp
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assert "alignas(template_::TextSaver<10>)" in main_cpp
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# Pointer declared as base type for polymorphism.
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assert (
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"static template_::TemplateTextSaverBase *const test_text_restore_value_saver"
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in main_cpp
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)
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# Placement new runs the templated subclass constructor.
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assert "new(test_text_restore_value_saver) template_::TextSaver<10>()" in main_cpp
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# Base-class default ctor must NOT be used.
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assert (
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"new(test_text_restore_value_saver) template_::TemplateTextSaverBase()"
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not in main_cpp
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)
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# No heap `new TextSaver<...>()` left over — the pre-fix pattern.
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assert "new template_::TextSaver<" not in main_cpp
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# Saver is wired into the text component.
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assert (
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"test_text_restore->set_value_saver(test_text_restore_value_saver)" in main_cpp
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)
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