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func Test_ServiceLogsProperly(t *testing.T) {
    // --- Given ---
    // Crate zerolog test helper. 
    tst := zltest.New(t)

    // Configure zerolog and pas tester as a writer.     
    log := zerolog.New(tst).With().Timestamp().Logger()
    
    // Inject log to tested service or package.
    srv := MyService(log)

    // --- When ---
    srv.ExecuteSomeLogic()

    // --- Then ---

    // Test if log messages were generated properly.
    ent := tst.LastEntry()
    ent.ExpNum("key0", 123)
    ent.ExpMsg("message")
    ent.ExpLevel(zerolog.ErrorLevel)
}