imp: added a debug function to debug logging before logging is config…

…ured

projects/logging/logging-configure/src/main/kotlin/io/tnboot/logging/configure/internal/Debug.kt

@@ -0,0 +1,7 @@
+package io.tnboot.logging.configure.internal
+
+internal fun debug(message: String) {
+	if (System.getProperty("io.tnboot.debug")?.contains("logging") == true) {
+		println("[DEBUG] (io.tnboot.logging) $message")
+	}
+}

projects/logging/logging-configure/src/test/kotlin/io/tnboot/logging/configure/internal/DebugTest.kt

@@ -0,0 +1,42 @@
+package io.tnboot.logging.configure.internal
+
+import java.io.ByteArrayOutputStream
+import java.io.PrintStream
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class DebugTest {
+	@Test
+	fun `should debug logging when logging is included in io-tnboot-logging`() = synchronized(this) {
+		val previousOut = System.out
+		val outputStream = ByteArrayOutputStream()
+		System.setOut(PrintStream(outputStream))
+
+		val beforeProperty = System.getProperty("io.tnboot.debug")
+		System.setProperty("io.tnboot.debug", "logging")
+
+		debug("Hello, World!")
+
+		System.setOut(previousOut)
+		beforeProperty?.let { System.setProperty("io.tnboot.debug", it) } ?: System.clearProperty("io.tnboot.debug")
+
+		assertEquals("[DEBUG] (io.tnboot.logging) Hello, World!\n", outputStream.toString())
+	}
+
+	@Test
+	fun `should not debug logging when logging is not included in io-tnboot-logging`() = synchronized(this) {
+		val previousOut = System.out
+		val outputStream = ByteArrayOutputStream()
+		System.setOut(PrintStream(outputStream))
+
+		val beforeProperty = System.getProperty("io.tnboot.debug")
+		System.setProperty("io.tnboot.debug", "something-else")
+
+		debug("Hello, World!")
+
+		System.setOut(previousOut)
+		beforeProperty?.let { System.setProperty("io.tnboot.debug", it) } ?: System.clearProperty("io.tnboot.debug")
+
+		assertEquals(0, outputStream.size())
+	}
+}