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Akhil Velagapudi
bac69e5ce9
Amp-Thread-ID: https://ampcode.com/threads/T-01a049f3-6fc0-76ca-af3e-89e69679c03e
36 lines
1.5 KiB
Python
36 lines
1.5 KiB
Python
"""Tests for general utility functions."""
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load("../units.zen", "Capacitance", "Resistance")
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load("../utils.zen", "E_SERIES", "e3", "e6", "e12", "e24", "e48", "e96", "e192")
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check(len(E_SERIES["E48"]) == 48, "E48 should contain 48 values")
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check(len(E_SERIES["E192"]) == 192, "E192 should contain 192 values")
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check(e48(Resistance("115ohm")) == Resistance("115ohm"), "E48 should preserve 115 ohm")
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check(e192(Resistance("740.3kohm")) == Resistance("741kohm"), "E192 should snap 740.3 kohm to 741 kohm")
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for series_name, snap in [
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("E3", e3),
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("E6", e6),
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("E12", e12),
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("E24", e24),
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("E48", e48),
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("E96", e96),
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("E192", e192),
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]:
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check(
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snap(Capacitance("9.97nF")) == Capacitance("10nF"),
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"{} should consider the next decade".format(series_name),
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)
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# Preserve absolute-nearest behavior where it differs from geometric-nearest.
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check(e12(Capacitance("9.08nF")) == Capacitance("8.2nF"), "E12 should use absolute distance")
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# Check the same boundary above and below the base-unit decade.
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check(e12(Capacitance("0.997nF")) == Capacitance("1nF"), "E12 should cross a lower decade")
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check(e24(Capacitance("99.7nF")) == Capacitance("100nF"), "E24 should cross a higher decade")
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# Preserve exact E-series inputs when restoring their original decade.
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for value in ["40.2kohm", "402ohm", "402kohm"]:
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check(e96(Resistance(value)) == Resistance(value), "E96 should preserve exact value " + value)
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check(e24(Capacitance("2.7nF")) == Capacitance("2.7nF"), "E24 should preserve exact value 2.7nF")
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