moved the stdlib tests into the same directory as the stdlib, so it works a bit better with maven support in IDEA

libraries/stdlib/test/StringTest.kt

@@ -0,0 +1,49 @@
+package test.string
+
+import kotlin.io.*
+import kotlin.test.*
+
+import junit.framework.*
+
+class StringTest() : TestCase() {
+    fun testStringIterator() {
+        var sum = 0
+        for(c in "239")
+            sum += (c.toInt() - '0'.toInt())
+        assertTrue(sum == 14)
+    }
+
+    fun testStringBuilderIterator() {
+        var sum = 0
+        val sb = StringBuilder()
+        for(c in "239")
+            sb.append(c)
+
+        println(sb)
+
+        for(c in sb)
+            sum += (c.toInt() - '0'.toInt())
+        assertTrue(sum == 14)
+    }
+
+    fun testOrEmpty() {
+        val s: String? = "hey"
+        val ns: String? = null
+
+        assertEquals("hey", s.orEmpty())
+        assertEquals("", ns.orEmpty())
+    }
+
+    fun testToShort() {
+        assertEquals(77.toShort(), "77".toShort())
+    }
+
+    fun testToInt() {
+        assertEquals(77, "77".toInt())
+    }
+
+    fun testToLong() {
+        assertEquals(77.toLong(), "77".toLong())
+    }
+
+}