JS: move expressions test to box tests

js/js.translator/testData/box/expression/misc/KT-740-2.kt

@@ -0,0 +1,57 @@
+package foo
+
+var c0 = 0
+var c1 = 0
+var c2 = 0
+var c3 = 0
+
+fun cStr(): String {
+    return "${c0}${c1}${c2}${c3}"
+}
+
+fun get1(): Int {
+    c3++
+    return 1
+}
+
+class A() {
+    var p = 0
+    operator fun get(i: Int): Int {
+        c1++
+        return 0
+    }
+
+    operator fun set(i: Int, value: Int) {
+        c2++
+    }
+}
+
+val a: A = A()
+    get() {
+        c0++
+        return field
+    }
+
+fun box(): String {
+    var d = a[1]
+    if (cStr() != "1100") {
+        return "Fail: d = a[1], cStr(): ${cStr()}"
+    }
+
+    ++a[1]
+    if (cStr() != "2310") {
+        return "Fail: ++a[1], cStr(): ${cStr()}"
+    }
+
+    --a[1]
+    if (cStr() != "3520") {
+        return "Fail: --a[1], cStr(): ${cStr()}"
+    }
+
+    ++a[get1()]
+    if (cStr() != "4731") {
+        return "Fail: ++a[get1()], cStr(): ${cStr()}"
+    }
+
+    return "OK"
+}