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Calling Reinterpret<bool> on NativeArray<byte> fails with 'Expected: True' 'But Was: True' in unit tests

Unity Test Runner


How to reproduce:
1. Open user-submitted project (
2. Open Window > General >Test Runner
3. Run All Edit Mode tests

Expected result: test 'ReinterpretByteToBool' passes
Actual result: test 'ReinterpretByteToBool' fails with expected: True, but was: True

Reproducible with: 2019.3.0a7, 2019.3.4f1, 2020.1.0a26, 2020.2.0a1
Could not test with: 2017.4.37f1, 2018.4.18f1, 2019.3.0a6 (NativeArray<byte>' does not contain a definition for 'Reinterpret')

  1. Response avatar

    Resolution Note:

    bytes[0] = 255;

    should be changed to

    bytes[0] = 1;

    then test will pass.

    In C# underlying type for boolean is byte, you can't really make true out of 255. But you can do it out of 1.

    Regarding Assert.IsTrue(). What nunit does in this case is something like this:
    Under the hood nunit does this :
    public override ConstraintResult ApplyTo(object actual)
    return new ConstraintResult((IConstraint) this, actual, true.Equals(actual));

    so it is basically an equals operator:
    If you distill this part into code

    bytes[0] = 255;
    NativeArray<bool> bools = bytes.Reinterpret<bool>();
    var b1 = bools[0].Equals(true); // false

    bool[] pureBool = {true};
    pureBool[0] = true;
    var b2 = pureBool[0].Equals(true); // true

    So equals ends up comparing 1 to 255

    The reason why error message looks so weird, is that ToString method doesn't really know how to translates both 255 and 1 into True.

Comments (1)

  1. C604bca1e30789ce59d0f332d77b087f?d=mm


    Mar 01, 2020 03:34

    <a href="">Wow Its Very Nice</a>

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