Supporting data class for JS backend

js/js.translator/testData/dataClass/cases/hashcode.kt

@@ -0,0 +1,88 @@
+package foo
+
+import java.util.ArrayList
+
+
+data class Holder<T>(val v: T)
+
+data class Dat(val start: String, val end: String)
+
+class Obj(val start: String, val end: String)
+
+
+fun assertEquals<T>(expected: T, actual: T) {
+    if (expected != actual) throw Exception("expected: $expected, actual, $actual")
+}
+
+fun assertSomeNotEqual<T>(c: Iterable<T>) {
+    val it = c.iterator()
+    val first = it.next()
+    while (it.hasNext()) {
+        val item: T = it.next()
+        if (item != first) {
+            return;
+        }
+    }
+    throw Exception("All elements are the same: $first")
+}
+
+fun assertAllEqual<T>(c: Iterable<out T>) {
+    val it = c.iterator()
+    val first = it.next()
+    while (it.hasNext()) {
+        val item: T = it.next()
+        assertEquals(first, item)
+    }
+}
+
+val hashCoder: (o: Any) -> Int = { o -> o.hashCode() }
+
+val <T> wrapInH = { (t: T) -> Holder(t) }
+
+fun box(): String {
+
+    // Check that same Dat's have the same hashcode.
+    val sameDs = listOf(Dat("a", "b"), Dat("a", "b"))
+    assertAllEqual(map(sameDs, hashCoder))
+
+    // Check that different Dat's have different hashcodes (at least some of them).
+    val differentDs = listOf(Dat("a", "b"), Dat("a", "c"), Dat("a", "d"))
+    assertSomeNotEqual(map(differentDs, hashCoder))
+
+    // Check the same on Obj's, which should be always different and with different hashcodes.
+    val sameOs = listOf(Obj("a", "b"), Obj("a", "b"), Obj("a", "b"))
+    val differentOs = listOf(Obj("a", "b"), Obj("a", "b"), Obj("a", "b"))
+
+    // Obj's are always different.
+    assertSomeNotEqual(map(sameOs, hashCoder))
+    assertSomeNotEqual(map(differentOs, hashCoder))
+
+    // Both Dat's and Obj's wrapped as Holder should retain their hashcode relations.
+    val sameHDs = map(sameDs, wrapInH)
+    assertAllEqual(map(sameHDs, hashCoder))
+    val differentHDs = map(differentDs, wrapInH)
+    assertSomeNotEqual(map(differentHDs, hashCoder))
+
+    val sameHOs = map(sameOs, wrapInH)
+    assertSomeNotEqual(map(sameHOs, hashCoder))
+    val differentHOs = map(differentOs, wrapInH)
+    assertSomeNotEqual(map(differentHOs, hashCoder))
+
+    return "OK"
+}
+
+fun listOf<T>(vararg a: T): List<T> {
+    val list = ArrayList<T>()
+    for (e in a) {
+        list.add(e)
+    }
+    return list
+}
+
+fun map<T, S>(c : Iterable<T>, transform : (T) -> S) : List<S> {
+    val list = ArrayList<S>()
+    for (t in c) {
+        list.add(transform(t))
+    }
+    return list
+}