added a little sample test case of data classes

libraries/stdlib/test/DataClassTest.kt

@@ -0,0 +1,25 @@
+package test.dataclass
+
+import org.junit.Test
+import kotlin.test.*
+
+/**
+ */
+class DataClassTest {
+    Test fun dataClass() {
+        val p = Person("James", 43)
+        // TODO no nice toString() yet
+        println("Got $p")
+
+        val (a, b) = p
+        println("a: $a, b: $b")
+        assertEquals("James", a, "a")
+        assertEquals(43, b, "b")
+
+        // TODO not implemented yet
+        // assertEquals(Person("James", 43), Person("James", 43), "person equals")
+        // assertTrue(Person("ZZZ", 21) > Person("AAA", 21), "person a > b")
+    }
+}
+
+data class Person(val name: String, val age: Int)