JS: move expressions test to box tests

js/js.translator/testData/box/expression/stringClass/objectToStringCallInTemplate.kt

@@ -0,0 +1,18 @@
+package foo
+
+class A(var i: Int) {
+    override fun toString() = "a$i"
+}
+
+fun box(): String {
+    var p = A(2);
+    var n = A(1);
+    if ("$p$n" != "a2a1") {
+        return "fail1"
+    }
+    if ("${A(10)}" != "a10") {
+        return "fail2"
+    }
+    return "OK"
+}
+