Share the size line format, derive source extensions from a kind map, close_fds on the ccache probe

tests/unit_tests/build_helpers/test_size_summary.py

@@ -2,9 +2,21 @@
 
 from __future__ import annotations
 
-from esphome.build_helpers.size_summary import format_bar
+import pytest
+
+from esphome.build_helpers.size_summary import format_bar, print_size_line
 
 
 def test_format_bar_zero_total() -> None:
     """A zero total must not divide by zero."""
     assert format_bar(0, 0) == "[          ]   0.0% (used 0 bytes from 0 bytes)"
+
+
+def test_print_size_line_label_padding(capsys: pytest.CaptureFixture[str]) -> None:
+    """The label column is exactly what ci_memory_impact_extract.py greps."""
+    print_size_line("RAM", 47932, 180736)
+    print_size_line("Flash", 888511, 1835008)
+    out = capsys.readouterr().out.splitlines()
+    assert out[0].startswith("RAM:   [")
+    assert out[1].startswith("Flash: [")
+    assert "26.5% (used 47932 bytes from 180736 bytes)" in out[0]