An expectation for a subject whose observable is text

[pathscale]

Every assertion here that names a node also demands a non-zero box. That is right for a control, a panel or an icon. It is wrong for a heading, because a heading is exactly as wide as its line and exactly as tall as its shaped glyphs. On a host with no font registered it lays out at 1328x0, and a check about it fails while the engine did nothing wrong.

This is not hypothetical

All six of ps-blitz's activation fixtures report their outcome by appending a heading whose text says what happened — "Press saw true, left false" — and assert it with PaintsNamed. All fourteen checks failed the moment qa-inspect-host stopped enabling system-fonts in #15:

FAIL cancelled-click       FAIL checkbox-activation
FAIL controlled-checkbox   FAIL disabled-label
FAIL radio-set             FAIL switch-over-label

They had only ever passed because the host carried a font catalogue, which is precisely what a headless check must not need. The claim on record that they passed "against a host with no font at all" was measured against a host that had one.

What Present asks

Did the node the document was supposed to produce appear, with the name it was supposed to have, and was it laid out.

It stays falsifiable in the two ways that matter, and both are measured rather than asserted:

• Repointing cancelled-click at heading:Not In This Document fails with no node matching "heading:Not In This Document" exists in the tree, while the other five fixtures still pass. So it discriminates rather than failing everything.
• A node created but never laid out fails on the bounds.

What it deliberately does not claim is that glyphs reached the scene. That is a question about fonts rather than about the engine, and it cannot be asked on a machine that has none.

Paints and PaintsNamed are unchanged and remain correct for anything with a box of its own. They are stronger, and they cost nothing on a fontless host.

Breaking, hence 0.6.0

Adding a variant to a public enum stops a downstream match over Expect compiling. Minor bump rather than patch.

Verified

Against ps-blitz's suite, with a host built from this checkout and no system-fonts anywhere in its graph: 6 of 6 fixtures, 14 of 14 checks. The paired ps-blitz change is pathscale/ps-blitz#87, whose Debug control job builds ps-qa from this branch's master and cannot go green until this lands.