JS: move expressions test to box tests

js/js.translator/testData/box/expression/equals/explicitEqualsMethod.kt

@@ -0,0 +1,28 @@
+package foo
+
+class Foo(val name: String) {
+    override fun equals(other: Any?): Boolean {
+        if (other !is Foo) {
+            return false
+        }
+        return this.name == other.name
+    }
+}
+
+class Bar() {
+
+}
+
+fun box(): String {
+    val a = Foo("abc")
+    val b = Foo("abc")
+    val c = Foo("def")
+
+    if (!(a.equals(b))) return "fail1"
+    if (a.equals(c)) return "fail2"
+    if (Bar().equals(Bar())) return "fail3"
+    val g = Bar()
+    if (!(g.equals(g))) return "fail4"
+    if (g.equals(Bar())) return "fail5"
+    return "OK"
+}