SurfaceSources

B92's single-photon branch and the midpoint's finite block

7/7 passed in 0ms

Test	What it does	Result
test_bias_apart	A sender's key-basis probability is its own field, undefaulted and refused outside (0, 1): folding it into sift would charge a sifting the midpoint rate excludes.	✅ pass
test_block_counted	The announced Bell-state count has no default, and a linear-optics analyser refuses four.	✅ pass
test_block_per_state	per_state(n) divides eps_sec by the announced Bell-state count, and that divided budget is what reaches _core.mdi_length.	✅ pass
test_block_typed	A midpoint's block is not a q.KeyBlock, and the slot refuses one by name rather than reading the fields they share.	✅ pass
test_coherent_unchanged	The default source is the coherent pair, with no depolarising rate.	✅ pass
test_single_reaches_plain	source='single' reaches b92_plain, with mu spelling the amplitude overlap e^-2mu that engine is written in.	✅ pass
test_source_paired	The depolarising channel belongs to the single-photon branch alone, and each branch refuses the other's description by name.	✅ pass