fix

tests/test_images.py

@@ -0,0 +1,75 @@
+"""Images inside table cells.
+
+WeasyPrint resolves a percentage width of an image in a table cell against a
+width it does not know yet and the image comes out zero wide. It then vanishes
+from the PDF without any error, so it is not even reported as a missing asset.
+"""
+
+from __future__ import annotations
+
+import pytest
+
+pytest.importorskip("lxml")
+
+from app.pdf.document import SourceDocument  # noqa: E402
+
+CELL_IMAGE = """
+<!DOCTYPE html><html><head><meta charset="utf-8"></head>
+<body>
+  <table width="100%">
+    <tr>
+      <td width="40%">
+        <img src="https://example.com/foto.jpg"
+             style="width: 100%; max-width: 300px; height: auto; display: block;">
+      </td>
+      <td>Popis produktu</td>
+    </tr>
+  </table>
+</body></html>
+"""
+
+FREE_IMAGE = """
+<!DOCTYPE html><html><head><meta charset="utf-8"></head>
+<body>
+  <div><img src="https://example.com/foto.jpg" style="width: 100%; max-width: 300px;"></div>
+</body></html>
+"""
+
+WIDTH_ATTRIBUTE = """
+<!DOCTYPE html><html><head><meta charset="utf-8"></head>
+<body><table><tr><td><img src="https://example.com/foto.jpg" width="100%"></td></tr></table></body>
+</html>
+"""
+
+
+def _image_style(document: SourceDocument) -> str:
+    return document.tree.find(".//img").get("style") or ""
+
+
+def test_percentage_width_in_a_cell_becomes_auto() -> None:
+    document = SourceDocument(CELL_IMAGE)
+
+    assert document.relax_percentage_image_widths() == 1
+
+    style = _image_style(document)
+    assert "width: auto" in style
+    # The cap the document asked for has to survive, it is what limits the size now.
+    assert "max-width: 300px" in style
+    assert "height: auto" in style
+
+
+def test_image_outside_a_table_is_left_alone() -> None:
+    document = SourceDocument(FREE_IMAGE)
+
+    assert document.relax_percentage_image_widths() == 0
+    assert "width: 100%" in _image_style(document)
+
+
+def test_percentage_width_attribute_is_dropped() -> None:
+    document = SourceDocument(WIDTH_ATTRIBUTE)
+
+    assert document.relax_percentage_image_widths() == 1
+
+    image = document.tree.find(".//img")
+    assert image.get("width") is None
+    assert "max-width: 100%" in (image.get("style") or "")