LDC-E1376 — Test case name not registered

What it means

Not triggerable in a hermetic recipe.

A test file that names a case the package never registered gets this diagnostic with the nearest registered names as hints (case_reference_diagnostics in the language server). This diagnostic is emitted by the editor surface only — no command-line tool reports it — so no command-line recipe reproduces it. If you meet the code in the editor, read it as “no such case; did you mean one of these” and take one of the suggested names or register the new one.