Logging disappeared when calling DataFrame API in tests

[hantsy]

I tried to add some logs in the tests that parsing the csv file. There is an interesting issue I found. My project tech stack is a Spring Boot/R2dbc/Kotlin Coroutinnes, by default I used sfl4j API and Logback in the background.

In the unit tests for parsing csv using DataFrame, the log.debug does not print the logging stack at all, but print works well.

class MyDataReaderTest{
    companion object {
        private val log = LoggerFactory.getLogger(MyDataReaderTest::class.java)
    }

    private val processor = MyDataReader()

    @Test
    fun `parsing sample csv file`() {
        val fileName = "..."
        val result = processor.read(ClassPathResource(fileName).file.readBytes())
        // log.debug("parsed result: $result")
        println("parsed result: $result")
        result.timesheetItems.size shouldBe 4
    }
}

In other tests, such my Controller, Repository etc, that does not contain the DataFrame part, the logging is working well.

I am not sure what is root cause of this issue.

[koperagen]

Hi! Can it be that logger is not configured for specific test class? Or, to put it another way, if you add this test to one of those other tests you have, will logging stop working there too?

[hantsy]

@koperagen I updated the original post, and add an dummy test example(which is modified from my real example, just removed the business related words)