Kotlin I/O new features: relativeTo, copyTo, copyRecursively, deleteRecursively, file tree walkers,

file component iterators, file roots, startsWith, endsWith, subPath, normalize, replaceBytes, replaceTest,
additional tests and comments

libraries/stdlib/test/io/IOStreams.kt

@@ -0,0 +1,29 @@
+package test.io
+
+import org.junit.Test as test
+import java.io.Writer
+import java.io.BufferedReader
+import java.io.File
+import kotlinhack.test.assertEquals
+
+class IOStreamsTest {
+    test fun testGetStreamOfFile() {
+        val tmpFile = createTempFile()
+        var writer: Writer? = null
+        try {
+            writer = tmpFile.outputStream().writer()
+            writer!!.write("Hello, World!")
+        } finally {
+            writer?.close()
+        }
+        var act: String?
+        var reader: BufferedReader? = null
+        try {
+            reader = tmpFile.inputStream().reader().buffered()
+            act = reader!!.readLine()
+        } finally {
+            reader?.close()
+        }
+        assertEquals("Hello, World!", act)
+    }
+}