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https://github.com/mwisnowski/mtg_python_deckbuilder.git
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37 lines
1.1 KiB
Python
37 lines
1.1 KiB
Python
from __future__ import annotations
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from random_util import derive_seed_from_string, set_seed, get_random, generate_seed
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def test_derive_seed_from_string_stable():
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# Known value derived from SHA-256('test-seed') first 8 bytes masked to 63 bits
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assert derive_seed_from_string('test-seed') == 6214070892065607348
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# Int passthrough-like behavior (normalized to positive 63-bit)
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assert derive_seed_from_string(42) == 42
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assert derive_seed_from_string(-42) == 42
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def test_set_seed_deterministic_stream():
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r1 = set_seed('alpha')
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r2 = set_seed('alpha')
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seq1 = [r1.random() for _ in range(5)]
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seq2 = [r2.random() for _ in range(5)]
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assert seq1 == seq2
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def test_get_random_unseeded_independent():
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a = get_random()
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b = get_random()
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# Advance a few steps
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_ = [a.random() for _ in range(3)]
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_ = [b.random() for _ in range(3)]
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# They should not be the same object and streams should diverge vs seeded
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assert a is not b
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def test_generate_seed_range():
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s = generate_seed()
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assert isinstance(s, int)
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assert s >= 0
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# Ensure it's within 63-bit range
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assert s < (1 << 63)
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