Files
Jungfraujoch/tests
leonarski_fandClaude Opus 5 46c50ac744 tests: the merged MTZ's base dataset, which nothing covered
WriteReflections had no test at all, and the defect it hid was invisible to two
of the three libraries that read an MTZ: with the data dataset written at id 0 -
the id reserved for HKL_base - gemmi and iotbx still returned the real
wavelength, and only CCP4's mtzinfo fell back to the 1.54187 A Cu K-alpha
default. iotbx reading such a file reports two datasets both numbered 0.

The test writes a merged MTZ through the real writer at a wavelength well away
from that default, reads the file back, and asserts the layout the report
depends on: HKL_base at id 0, the data dataset at id 1 carrying the wavelength,
and every data column owned by the data dataset rather than the base - that
ownership is what the reported wavelength is read off. Cell and space group are
checked with it, since they travel in the same header.

Verified against the pre-fix writer (base absent, H K L added on the data
dataset): it fails on the dataset count.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EFEJG6WBQv8th4UJFNe53N
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