Scratch: add multifile tests

idea/testData/scratch/when.comp.after

@@ -0,0 +1,19 @@
+val a = 1    // RESULT: val a: Int
+when(a) {    // OUTPUT: 1
+    1 -> println("1")
+    else -> println("2")
+}
+
+when(a) {    // OUTPUT: 1
+    1 -> println("1")
+}
+
+when(a) {    // OUTPUT: 1
+    2 -> println("2")
+    else -> println("1")
+}
+
+when(a) {    // RESULT: 11
+    1 -> 11
+    else -> 12
+}