Tests

pixi run test     # tests/test_tandem.py

Suite

tests/test_tandem.py checks:

• Every specification vector (tests/vectors.json) and the stream dumps in tests/data.
• below, normal, and exponential against the tandem-cuda fixtures in external/tandem-c/tests.
• The standard_normal and standard_exponential fills against hashes of the dumps from tandem-c's tools/dump_normals.c and tools/dump_exponentials.c.
• Fills cut at any element boundary equal the whole fill.

tests/test_tandem.py checks every vector of the specification (tests/vectors.json, a copy of the spec repository's file) and compares fills and scalar draws with reference stream dumps in tests/data. The new paths are checked the same way: fill, u128, and char against the dumps of every specification type, at and advance_to against the dumps and against fills from the same position, spawn against split, and below, normal, and exponential against the tandem-cuda fixtures in external/tandem-c/tests (cross_below.h, cross_fill_below.h, cross_normal.h, cross_exponential.h), which the test parses. The normal and exponential fixtures must match bit for bit. TandemGenerator is checked against the same fills and fixtures, including integers calls of every dtype, with and without endpoint, cut at arbitrary boundaries against the whole call. A hash test compares the standard_normal float64 fills with the bytes of tandem-c's tools/dump_normals.c (SHA-256 700ec4d2…) and the float32 fills with the bytes tandem-c's tests/test_normal_bits.c hashes (FNV-1a 0xaa1ea656ce73a4fb, checked here as SHA-256), so they are the same bits on every compiler. The standard_exponential fills have the same test against tools/dump_exponentials.c (FNV-1a 0x1c761a2d471073c2). Fills cut at element boundaries, n = 0, the Exp(1) moments to fourth order, and a Kolmogorov-Smirnov test on 10^7 draws cover the rest.

Fixtures

tools/bump.sh moves the pin to the latest main.