JS backend: testFiles -> testData

js/js.translator/testData/expression/misc/cases/elvis.kt

@@ -0,0 +1,21 @@
+package foo
+
+fun box(): Boolean {
+    if (f(null) != false) {
+        return false;
+    }
+    if (f(2) != true) {
+        return false;
+    }
+    if (f(1) != false) {
+        return true;
+    }
+    return true
+}
+
+fun Int.isEven() = (this % 2) == 0
+
+fun f(a: Int?): Boolean {
+    return a?.isEven() ?: false
+
+}