Create from usage: Added tests.

idea/testData/quickfix/createFromUsage/next/afterCreateNextFromUsage2.kt

@@ -0,0 +1,15 @@
+// "Create method 'next' from usage" "true"
+class FooIterator<T> {
+    fun hasNext(): Boolean { return false }
+    fun next(): T {
+        throw Exception("not implemented") //To change body of created methods use File | Settings | File Templates.
+    }
+}
+class Foo<T> {
+    fun iterator(): FooIterator<T> {
+        throw Exception("not implemented")
+    }
+}
+fun foo() {
+    for (i: Int in Foo<Int>()) { }
+}