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Zero code coverage for NaN-safe mode #775

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#776
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Zero code coverage for NaN-safe mode#775
#776
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nan-safe-mode
@devmotion

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@devmotion
devmotion
opened on Oct 1, 2025

Tests of NaN-safe mode are only run if NaN-safe mode is enabled:

ForwardDiff.jl/test/PartialsTest.jl

Lines 119 to 132 in 463e830

if ForwardDiff.NANSAFE_MODE_ENABLED
ZEROS = Partials((fill(zero(T), N)...,))
@test (NaN * ZEROS).values == ZEROS.values
@test (Inf * ZEROS).values == ZEROS.values
@test (ZEROS / 0).values == ZEROS.values
@test ForwardDiff._mul_partials(ZEROS, ZEROS, X, NaN).values == ZEROS.values
@test ForwardDiff._mul_partials(ZEROS, ZEROS, NaN, X).values == ZEROS.values
@test ForwardDiff._mul_partials(ZEROS, ZEROS, X, Inf).values == ZEROS.values
@test ForwardDiff._mul_partials(ZEROS, ZEROS, Inf, X).values == ZEROS.values
@test ForwardDiff._mul_partials(ZEROS, ZEROS, Inf, NaN).values == ZEROS.values
@test ForwardDiff._mul_partials(ZEROS, ZEROS, NaN, Inf).values == ZEROS.values
end

However, CI tests are only run without NaN-safe mode. Therefore the NaN-safe mode implementation is currently not covered by CI: https://app.codecov.io/gh/JuliaDiff/ForwardDiff.jl/blob/master/src%2Fpartials.jl#L93

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