[WasmJs] Add async tests in kotlin.test

libraries/kotlin.test/build.gradle.kts

@@ -210,6 +210,9 @@ kotlin {
             dependsOn(wasmCommonMain)
             kotlin.srcDir("wasm/js/src/main/kotlin")
         }
+        val wasmJsTest by getting {
+            kotlin.srcDir("wasm/js/src/test/kotlin")
+        }
         val wasmWasiMain by getting {
             dependsOn(wasmCommonMain)
             kotlin.srcDir("wasm/wasi/src/main/kotlin")

libraries/kotlin.test/wasm/js/src/test/kotlin/AsyncTest.kt

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.test.tests
+
+import kotlin.js.Promise
+import kotlin.test.*
+
+private external fun setTimeout(body: () -> Unit, timeout: Int)
+
+class AsyncTest {
+
+    var log = ""
+
+    var afterLog = ""
+
+    var expectedAfterLog = ""
+
+    @BeforeTest
+    fun before() {
+        log = ""
+        afterLog = ""
+        expectedAfterLog = ""
+    }
+
+    @AfterTest
+    fun after() {
+        assertEquals(afterLog, expectedAfterLog)
+    }
+
+    fun promise(v: Int, after: String = "") = Promise { resolve, _ ->
+        log += "a"
+        setTimeout({ log += "c"; afterLog += after; resolve(v.toJsNumber()) }, 100)
+        log += "b"
+    }.also {
+        expectedAfterLog += after
+    }
+
+    @Test
+    @Ignore //Remove after bootstrap KT-65322
+    fun checkAsyncOrder(): Promise<JsNumber> {
+        log += 1
+
+        val p1 = promise(10, "after")
+
+        log += 2
+
+        val p2 = p1.then { result ->
+            assertEquals(log, "1ab23c")
+            result
+        }
+
+        log += 3
+
+        return p2
+    }
+
+    @Test
+    @Ignore //Remove after bootstrap KT-65322
+    fun checkCustomPromise(): CustomPromise {
+        return promise(10, "") as CustomPromise
+    }
+
+    @Test
+    @Ignore //Remove after bootstrap KT-65322
+    fun asyncPassing() = promise(10).then { assertEquals(10, it.toInt()); it }
+}
+
+@JsName("Promise")
+external class CustomPromise {}