Added test for closure template.

idea/testData/templates/closure.exp.kt

@@ -0,0 +1,3 @@
+fun main(args : Array<String>) {
+    val someFun = {param -> param}<caret>
+}

idea/testData/templates/closure.kt

@@ -0,0 +1,3 @@
+fun main(args : Array<String>) {
+    val someFun = <caret>
+}