JS backend: tests for KT-5772

js/js.translator/testData/expression/compareTo/cases/customCompareToMethod.kt

@@ -0,0 +1,40 @@
+package foo
+
+class A(val value: Int) : Comparable<A> {
+    override public fun compareTo(other: A): Int = other.value compareTo value
+}
+
+class B(val value: Int)
+
+fun testExtensionFunctionAsCompareTo() {
+    val compareTo: B.( B ) -> Int = { (other) -> other.value compareTo this.value }
+
+    val x: B = B(100)
+    val y: B = B(200)
+
+    assertEquals(false, x < y, "ext fun: x < y")
+    assertEquals(true, x > y, "ext fun: x > y")
+    assertEquals(1, x compareTo y, "ext fun: x compareTo y")
+}
+
+fun testMethodAsCompareTo() {
+    val x: A = A(100)
+    val y: A = A(200)
+
+    assertEquals(false, x < y, "meth: x < y")
+    assertEquals(true, x > y, "meth: x > y")
+    assertEquals(1, x compareTo y, "meth: x compareTo y")
+
+    assertEquals(false, (x: Comparable<A>) < y, "meth: (x: Comparable<A>) < y")
+    assertEquals(true, (x: Comparable<A>) > y, "meth: (x: Comparable<A>) > y")
+    assertEquals(1, (x: Comparable<A>) compareTo y, "meth: (x: Comparable<A>) compareTo y")
+}
+
+fun box(): String {
+
+    testExtensionFunctionAsCompareTo()
+
+    testMethodAsCompareTo()
+
+    return "OK"
+}