JS: move expressions test to box tests

js/js.translator/testData/box/expression/cast/castToKMutableProperty0.kt

@@ -0,0 +1,17 @@
+package foo
+
+import kotlin.reflect.KProperty0
+import kotlin.reflect.KMutableProperty0
+
+var x = 23
+
+fun box(): String {
+    assertEquals(true, (::x as Any) is KProperty0<*>)
+    assertEquals(true, (::x as Any) is KMutableProperty0<*>)
+    assertEquals(23, ((::x as Any) as KProperty0<Any>)())
+    assertEquals(23, ((::x as Any) as KMutableProperty0<Any>)())
+    assertEquals(false, (23 as Any) is KMutableProperty0<*>)
+    assertEquals(false, ({ x } as Any) is KMutableProperty0<*>)
+
+    return "OK"
+}