@Test
public void doLog_msgSupplier_enabled() throws Exception {

    when(underlyingLogger.isDebugEnabled(testMarker)).thenReturn(true);
    lambdaLogger.doLog(testMarker, Level.DEBUG, () -> "hello world!", testException);
    verify(underlyingLogger, times(1)).debug(eq(testMarker), eq("hello world!"), eq(testException));
}