added a sample natural language test case as per this discussion http://devnet.jetbrains.net/thread/437088?tstart=0

libraries/stdlib/test/NaturalLanguageTest.kt

@@ -0,0 +1,17 @@
+package test
+
+import org.junit.Test as test
+import kotlin.test.*
+
+class NaturalLanguageTest {
+
+    test fun `test strings equal`() {
+        val actual = "abc"
+        assertEquals("abc", actual)
+    }
+
+    test fun `test numbers equal`() {
+        val actual = 5
+        assertEquals(5, actual)
+    }
+}