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- Move canonical FixedPoint to Core/SilverSight/FixedPoint.lean - Add SilverSightRRC library: RRC logogram gates, receipt bridge, AVM ISA - Add AVMIsa.Emit as the sole top-level JSON output boundary - Add rrc-emit-fixture executable and Python I/O shims - Update AGENTS.md, glossary, project map, and build baseline Build: 2981 jobs, 0 errors (lake build)
66 lines
1.3 KiB
Python
66 lines
1.3 KiB
Python
"""Unit tests for python/q16_canonical.py.
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These are the canonical Q16_16 roundtrip witnesses. Every change to the Python
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fixed-point shim must keep them green.
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"""
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import math
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import pytest
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from python.q16_canonical import (
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Q16_MAX_FLOAT,
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Q16_MIN_FLOAT,
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Q16_SCALE,
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float_to_q16,
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q16_to_float,
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)
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def test_float_to_q16_zero():
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assert float_to_q16(0.0) == 0
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def test_float_to_q16_one():
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assert float_to_q16(1.0) == Q16_SCALE
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def test_float_to_q16_negative():
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assert float_to_q16(-1.0) == -Q16_SCALE
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def test_float_to_q16_pi_approx():
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raw = float_to_q16(math.pi)
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# π ≈ 3.1415926535 → raw ≈ 205887
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assert 205880 < raw < 205895
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def test_q16_to_float_one():
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assert q16_to_float(Q16_SCALE) == 1.0
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def test_roundtrip_typical_values():
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for x in [0.0, 1.0, -1.0, 3.1415926535, -1234.5678, 32767.5]:
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raw = float_to_q16(x)
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recovered = q16_to_float(raw)
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assert abs(recovered - x) < 1.5e-5
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def test_rejects_nan():
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with pytest.raises(ValueError):
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float_to_q16(float("nan"))
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def test_rejects_inf():
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with pytest.raises(ValueError):
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float_to_q16(float("inf"))
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def test_clamps_max():
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raw = float_to_q16(1e12)
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assert q16_to_float(raw) <= Q16_MAX_FLOAT
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def test_clamps_min():
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raw = float_to_q16(-1e12)
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assert q16_to_float(raw) >= Q16_MIN_FLOAT
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