fix log level check for #276

Author: oshai

src/jvmMain/kotlin/io/github/oshai/jul/internal/JulLoggerWrapper.kt

@@ -233,7 +233,7 @@ internal class JulLoggerWrapper(override val underlyingLogger: Logger) : KLogger
   }
 
   override fun warn(msg: String?) {
-    if (isTraceEnabled) {
+    if (isWarnEnabled) {
       underlyingLogger.log(io.github.oshai.Level.WARN.toJULLevel(), msg)
     }
   }
@@ -280,7 +280,7 @@ internal class JulLoggerWrapper(override val underlyingLogger: Logger) : KLogger
   }
 
   override fun error(msg: String?) {
-    if (isTraceEnabled) {
+    if (isErrorEnabled) {
       underlyingLogger.log(io.github.oshai.Level.ERROR.toJULLevel(), msg)
     }
   }

src/jvmMain/kotlin/io/github/oshai/slf4j/internal/LocationIgnorantKLogger.kt

@@ -285,7 +285,7 @@ internal class LocationIgnorantKLogger(override val underlyingLogger: Logger) :
   }
 
   override fun error(msg: String?) {
-    if (isTraceEnabled) {
+    if (isErrorEnabled) {
       underlyingLogger.error(msg)
     }
   }

src/jvmTest/kotlin/io/github/oshai/jul/internal/JulLoggerWrapperTest.kt

@@ -17,6 +17,8 @@ class JulLoggerWrapperTest {
 
   companion object {
     private lateinit var logger: KLogger
+    private lateinit var warnLogger: KLogger
+    private lateinit var errorLogger: KLogger
     private val appenderWithWriter: AppenderWithWriter = AppenderWithWriter()
 
     @BeforeAll
@@ -29,6 +31,10 @@ class JulLoggerWrapperTest {
       System.setProperty("kotlin-logging-to-jul", "true")
       addAppender(appenderWithWriter.appender)
       logger = KotlinLogging.logger {}
+      warnLogger = KotlinLogging.logger("warnLogger")
+      Logger.getLogger("warnLogger").level = Level.WARNING
+      errorLogger = KotlinLogging.logger("errorLogger")
+      Logger.getLogger("errorLogger").level = Level.SEVERE
     }
 
     @AfterAll
@@ -42,17 +48,25 @@ class JulLoggerWrapperTest {
   @Test
   fun testJulLogger() {
     assertTrue(logger is JulLoggerWrapper)
-    logger.info("simple jul message")
+    assertTrue(warnLogger is JulLoggerWrapper)
+    assertTrue(errorLogger is JulLoggerWrapper)
+    logger.info("simple jul info message")
+    warnLogger.warn("simple jul warn message")
+    errorLogger.error("simple jul error message")
     appenderWithWriter.writer.flush()
-    assertEquals(
-      "INFO  io.github.oshai.jul.internal.JulLoggerWrapperTest  - simple jul message",
+    val lines =
       appenderWithWriter
         .writer
         .toString()
         .trim()
         .replace("\r", "\n")
         .replace("\n\n", "\n")
-        .split("\n")[1]
+        .split("\n")
+    assertEquals(
+      "INFO  io.github.oshai.jul.internal.JulLoggerWrapperTest  - simple jul info message",
+      lines[1]
     )
+    assertEquals("WARN  warnLogger  - simple jul warn message", lines[2])
+    assertEquals("ERROR errorLogger  - simple jul error message", lines[3])
   }
 }