unit-testing - 如何找到@test失败的变量值

Question

单元测试时，了解故障点的变量值很有帮助

julia> @test a*4==2
Test Failed
  Expression: a * 4 == 2
   Evaluated: 4 == 2
ERROR: There was an error during testing
 in record(::Base.Test.FallbackTestSet, ::Base.Test.Fail) at .\test.jl:397
 in do_test(::Base.Test.Returned, ::Expr) at .\test.jl:281

例如在上面的最小测试中，显示 a 值的正确方法是什么？如果测试失败？

编辑
实际上，我正在为许多任意测试和变量寻找通用且实用的解决方案。

Answer 1

只是捕捉错误？如果您仍然希望再次抛出错误，则可以重新抛出它。

a = 2
try @test a*4 == 2
catch ex
    println("a = $a")
    error(ex)
end

会给:

Test Failed

Expression: a * 4 == 2

Evaluated: 8 == 2

a = 2

LoadError: ErrorException("There was an error during testing") whileloading In[44], in expression starting on line 5

in error(::ErrorException) at ./error.jl:22