Testing a Log statement output in Golang

Question

Hi I want to check that the output of a Log.error() is valid, I have this following code here

func logError(param bool)
bool {
    if (param == true)
        log.Error(fmt.Sprintf("I need to somehow tst, that the output here is correct"))

    return param;
}

I am not allowed to modify my existing code, I just want to ensure that whatever is printed by the console by my logError function, is what I expect it to be.

Is this possible without modifying my existing code, thank you.

The answer depends on which log library you are using.

Burak Serdar
– Burak Serdar

2021-10-26 02:17:19 +00:00
Commented Oct 26, 2021 at 2:17 — Burak Serdar
– Burak Serdar, Commented Oct 26, 2021 at 2:17
Apologies, I have just added my Log library.

Javedullah Ahmadi
– Javedullah Ahmadi

2021-10-26 02:36:29 +00:00
Commented Oct 26, 2021 at 2:36 — Javedullah Ahmadi
– Javedullah Ahmadi, Commented Oct 26, 2021 at 2:36
The Log library I am using is github.com/sirupsen/logrus

Javedullah Ahmadi
– Javedullah Ahmadi

2021-10-26 02:37:22 +00:00
Commented Oct 26, 2021 at 2:37 — Javedullah Ahmadi
– Javedullah Ahmadi, Commented Oct 26, 2021 at 2:37

Burak Serdar · Accepted Answer · 2021-10-26 02:46:45Z

4

With logrus, you can capture the output of the logger in a test:

oldOut:=log.StandardLogger().Out // Save current log target
buf:=bytes.Buffer{}
log.SetOutput(&buf)
logError(true)
// Here, buf.String() should give you the log msg
log.SetOutput(oldOut) // Restore log target

answered Oct 26, 2021 at 2:46

Burak Serdar

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