# @test\_logs behavior when using with\_logger
**URL:** https://discourse.julialang.org/t/test-logs-behavior-when-using-with-logger/80239
**Category:** General Usage
**Tags:** question
**Created:** [April 29, 2022, 2:26am UTC](https://discourse.julialang.org/t/test-logs-behavior-when-using-with-logger/80239 "2022-04-29T02:26:51Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@jdlara-berkeley](https://discourse.julialang.org/u/jdlara-berkeley)
#### Post date: [April 29, 2022, 2:26am UTC](https://discourse.julialang.org/t/test-logs-behavior-when-using-with-logger/80239/1 "2022-04-29T02:26:51Z")
When trying to test for logging inside of a custom logger, the @test\_logs macro seems to be unable to capture the logs.
Here is an MWE
```julia
using Test
using Logging
@test_logs (:error, "test") match_mode = :any Logging.with_logger(Logging.SimpleLogger()) do
@error "test"
end
```
Which returns empty captured logs
```julia
┌ Error: test
└ @ Main REPL[58]:2
Log Test Failed at REPL[58]:1
Expression: Logging.with_logger(Logging.SimpleLogger()) do
#= REPL[58]:2 =# @error "test"
end
Log Pattern: :error match_mode = :any
Captured Logs:
```
Anyone has experienced this and knows how to fix?
---
### Author:  [@veddox](https://discourse.julialang.org/u/veddox)
#### Post date: [January 24, 2023, 4:45pm UTC](https://discourse.julialang.org/t/test-logs-behavior-when-using-with-logger/80239/2 "2023-01-24T16:45:49Z")
I’ve just run into this as well. Did you manage to find a solution?
**Edit:**
Ah, having just looked through the source code, I understand the problem now:
I thought `@test_logs` intercepted and analysed `stdout/stderr`, but really it just [wraps](https://github.com/JuliaLang/julia/blob/b8adb2ede505e2d9eb2cfcd03caa64da643c9f22/stdlib/Test/src/logging.jl#L241) a [call](https://github.com/JuliaLang/julia/blob/b8adb2ede505e2d9eb2cfcd03caa64da643c9f22/stdlib/Test/src/logging.jl#L260) to [`with_logger(f, TestLogger)`](https://github.com/JuliaLang/julia/blob/b8adb2ede505e2d9eb2cfcd03caa64da643c9f22/stdlib/Test/src/logging.jl#L112). This means of course that it will never see any log messages sent to a different local logger.
That’s a bother. Does anybody have any ideas how one could circumvent this, or whether its worth submitting this as an issue?
---
### Author:  [@veddox](https://discourse.julialang.org/u/veddox)
#### Post date: [January 30, 2023, 12:00pm UTC](https://discourse.julialang.org/t/test-logs-behavior-when-using-with-logger/80239/3 "2023-01-30T12:00:24Z")
Submitted an issue here: [@test\_logs doesn't work when using local loggers · Issue #48456 · JuliaLang/julia · GitHub](https://github.com/JuliaLang/julia/issues/48456)
---
### Author:  [@veddox](https://discourse.julialang.org/u/veddox)
#### Post date: [January 31, 2023, 10:09am UTC](https://discourse.julialang.org/t/test-logs-behavior-when-using-with-logger/80239/4 "2023-01-31T10:09:17Z")
In case it helps anybody, I have now thought of a way to circumvent the issue in my case:
```julia
function withtestlogger(model)
# copied together from https://github.com/JuliaLang/julia/blob/master/base/logging.jl
logstate = current_task().logstate
logstate == nothing ? model.logger = global_logger() : model.logger = logstate.logger
model
end
function stepsimulation!(model)
with_logger(model.logger) do
@info "Updating model"
end
end
@test_logs((:info, "Updating model"),
min_level=Logging.Debug, match_mode=:any,
stepsimulation!(withtestlogger(model)))
```