[Wasm] Add Promise and support tests that return Promise

Co-authored-by: Ilya Gorbunov <Ilya.Gorbunov@jetbrains.com>

Merge-request: KT-MR-7717
Merged-by: Svyatoslav Kuzmich <svyatoslav.kuzmich@jetbrains.com>

libraries/kotlin.test/wasm/src/main/kotlin/kotlin/test/TeamcityAdapter.kt

@@ -7,6 +7,7 @@ package kotlin.test
 
 import kotlin.test.FrameworkAdapter
 import kotlin.math.abs
+import kotlin.js.*
 
 @JsFun("() => (typeof arguments !== 'undefined' && typeof arguments.join !== 'undefined') ? arguments.join(' ') : '' ")
 private external fun d8Arguments(): String
@@ -14,6 +15,28 @@ private external fun d8Arguments(): String
 private external fun nodeArguments(): String
 
 internal class TeamcityAdapter : FrameworkAdapter {
+
+    private var scheduleNextTaskAfter: Promise<Dynamic?>? = null
+    private fun runOrScheduleNext(block: () -> Unit) {
+        if (scheduleNextTaskAfter == null) {
+            block()
+        } else {
+            scheduleNextTaskAfter = scheduleNextTaskAfter!!.finally(block)
+        }
+    }
+
+    private fun runOrScheduleNextWithResult(block: () -> Promise<Dynamic?>?) {
+        if (scheduleNextTaskAfter == null) {
+            val result = block()
+            if (result != null)
+                scheduleNextTaskAfter = result
+        } else {
+            scheduleNextTaskAfter = scheduleNextTaskAfter!!.then {
+                block() as Dynamic?
+            }
+        }
+    }
+
     private enum class MessageType(val type: String) {
         Started("testStarted"),
         Finished("testFinished"),
@@ -50,25 +73,40 @@ internal class TeamcityAdapter : FrameworkAdapter {
         }
     }
 
+    private fun MessageType.report(name: String, errorMessage: String) {
+        println("##teamcity[$type name='${name.tcEscape()}' message='${errorMessage.tcEscape()}' $flowId]")
+    }
+
+
     private val testArguments: FrameworkTestArguments by lazy {
         val arguments = d8Arguments().takeIf { it.isNotEmpty() } ?: nodeArguments()
         FrameworkTestArguments.parse(arguments.split(' '))
     }
 
     private fun runSuite(name: String, suiteFn: () -> Unit) {
-        MessageType.SuiteStarted.report(name)
+        runOrScheduleNext {
+            MessageType.SuiteStarted.report(name)
+        }
         try {
             suiteFn()
-            MessageType.SuiteFinished.report(name)
+            runOrScheduleNext {
+                MessageType.SuiteFinished.report(name)
+            }
         } catch (e: Throwable) {
-            MessageType.SuiteFinished.report(name, e)
+            runOrScheduleNext {
+                MessageType.SuiteFinished.report(name, e)
+            }
         }
     }
 
     private fun runIgnoredSuite(name: String, suiteFn: () -> Unit) {
-        MessageType.SuiteStarted.report(name)
+        runOrScheduleNext {
+            MessageType.SuiteStarted.report(name)
+        }
         suiteFn()
-        MessageType.SuiteFinished.report(name)
+        runOrScheduleNext {
+            MessageType.SuiteFinished.report(name)
+        }
     }
 
     private var isUnderIgnoredSuit: Boolean = false
@@ -117,45 +155,77 @@ internal class TeamcityAdapter : FrameworkAdapter {
                 runSuite(name, suiteFn)
             }
         } else {
-            when (testArguments.ignoredTestSuites) {
-                IgnoredTestSuitesReporting.reportAsIgnoredTest -> {
-                    MessageType.Ignored.report(name)
-                }
-                IgnoredTestSuitesReporting.reportAllInnerTestsAsIgnored -> {
-                    var oldIsUnderIgnoredSuit = isUnderIgnoredSuit
-                    isUnderIgnoredSuit = true
-                    try {
-                        runIgnoredSuite(name, suiteFn)
-                    } finally {
-                        isUnderIgnoredSuit = oldIsUnderIgnoredSuit
+            runOrScheduleNext {
+                when (testArguments.ignoredTestSuites) {
+                    IgnoredTestSuitesReporting.reportAsIgnoredTest -> {
+                        MessageType.Ignored.report(name)
                     }
+
+                    IgnoredTestSuitesReporting.reportAllInnerTestsAsIgnored -> {
+                        var oldIsUnderIgnoredSuit = isUnderIgnoredSuit
+                        isUnderIgnoredSuit = true
+                        try {
+                            runIgnoredSuite(name, suiteFn)
+                        } finally {
+                            isUnderIgnoredSuit = oldIsUnderIgnoredSuit
+                        }
+                    }
+
+                    IgnoredTestSuitesReporting.skip -> {}
                 }
-                IgnoredTestSuitesReporting.skip -> { }
             }
         }
     }
 
     override fun test(name: String, ignored: Boolean, testFn: () -> Any?) {
         if (isUnderIgnoredSuit) {
-            MessageType.Ignored.report(name)
+            runOrScheduleNext {
+                MessageType.Ignored.report(name)
+            }
             return
         }
 
         if (ignored) {
-            MessageType.Ignored.report(name)
+            runOrScheduleNext {
+                MessageType.Ignored.report(name)
+            }
             return
         }
 
         enterIfIncluded(name, false) {
-            try {
+            runOrScheduleNextWithResult {
                 MessageType.Started.report(name)
-                if (!testArguments.dryRun) {
-                    testFn()
+
+                val result = try {
+                    if (!testArguments.dryRun) {
+                        testFn()
+                    } else {
+                        null
+                    }
+                } catch (e: Throwable) {
+                    MessageType.Failed.report(name, e)
                 }
-            } catch (e: Throwable) {
-                MessageType.Failed.report(name, e)
+                if (result is Promise<*>) {
+                    return@runOrScheduleNextWithResult result.then(
+                        onFulfilled = { value ->
+                            MessageType.Finished.report(name)
+                            value
+                        },
+                        onRejected = { e ->
+                            val throwable = e.toThrowableOrNull()
+                            if (throwable != null) {
+                                MessageType.Failed.report(name, throwable)
+                            } else {
+                                MessageType.Failed.report(name, e.toString())
+                            }
+                            MessageType.Finished.report(name)
+                            null
+                        }
+                    )
+                }
+                MessageType.Finished.report(name)
+                return@runOrScheduleNextWithResult null
             }
-            MessageType.Finished.report(name)
         }
     }
 }

libraries/stdlib/wasm/src/kotlin/Dynamic.kt

@@ -201,4 +201,36 @@ fun <T> Nothing?.unsafeCast(): Dynamic? = null
 /**
  * Reinterprets Dynamic type value as a value of the specified type [T] without any actual type checking.
  */
-fun <T> Dynamic.unsafeCast(): T = this as T
+fun <T> Dynamic.unsafeCast(): T = this as T
+
+@JsFun("e => { throw e; }")
+private external fun jsThrow(e: Dynamic)
+
+@JsFun("""(f) => {
+    let result = null;
+    try { 
+        f();
+    } catch (e) {
+       result = e;
+    }
+    return result;
+}""")
+private external fun jsCatch(f: () -> Unit): Dynamic?
+
+/**
+ * For a Dynamic value caught in JS, returns the corresponding [Throwable]
+ * if it was thrown from Kotlin, or null otherwise.
+ */
+public fun Dynamic.toThrowableOrNull(): Throwable? {
+    val thisAny: Any = this
+    if (thisAny is Throwable) return thisAny
+    var result: Throwable? = null
+    jsCatch {
+        try {
+            jsThrow(this)
+        } catch (e: Throwable) {
+            result = e
+        }
+    }
+    return result
+}

libraries/stdlib/wasm/src/kotlin/js/Promise.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2022 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.js
+
+/**
+ * Exposes the JavaScript [Promise object](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) to Kotlin.
+ */
+public external class Promise<out T>(executor: (resolve: (Dynamic?) -> Unit, reject: (Dynamic) -> Unit) -> Unit) {
+    public open fun then(onFulfilled: (Dynamic?) -> Dynamic?): Promise<Dynamic?>
+    public open fun then(onFulfilled: (Dynamic?) -> Dynamic?, onRejected: (Dynamic) -> Dynamic?): Promise<Dynamic?>
+    public open fun catch(onRejected: (Dynamic) -> Dynamic?): Promise<Dynamic?>
+    public open fun finally(onFinally: () -> Unit): Promise<Dynamic?>
+
+    public companion object {
+        public fun reject(e: Dynamic): Promise<Dynamic?>
+        public fun resolve(e: Dynamic): Promise<Dynamic?>
+        public fun resolve(e: Promise<Dynamic?>): Promise<Dynamic?>
+    }
+}
+
+

libraries/stdlib/wasm/src/kotlin/w3cSupport.kt

@@ -5,8 +5,6 @@
 
 package kotlin.js
 
-external class Promise<T>
-
 @PublishedApi
 internal val undefined: Nothing? = null
 

libraries/stdlib/wasm/test/js/AsyncTest.kt

@@ -0,0 +1,63 @@
+package test.js
+
+import kotlin.js.*
+import kotlin.test.*
+
+@JsFun("async () => 'foo'")
+internal external fun jsAsyncFoo(): Promise<Dynamic?>
+
+@JsFun("() => 'foo'")
+internal external fun jsFoo(): Dynamic
+
+var state: Dynamic? = null
+
+class MyThrowable : Throwable()
+
+class AsyncTest {
+    @Test
+    fun test1(): Promise<Dynamic?> {
+        var thenExecuted = false
+        val p = jsAsyncFoo().then { value ->
+            state = value
+            thenExecuted = true
+            null
+        }
+        assertFalse(thenExecuted)
+        return p
+    }
+
+    @Test
+    fun test2(): Promise<Dynamic?> {
+        assertEquals(state, jsFoo())
+        var thenExecuted = false
+        val p = jsAsyncFoo().then {
+            assertEquals(state, jsFoo())
+            thenExecuted = true
+            null
+        }.then {
+            assertEquals(state, jsFoo())
+            thenExecuted = true
+            null
+        }
+        assertFalse(thenExecuted)
+        return p
+    }
+
+    @Test
+    fun testJsValueToThrowableOrNull1(): Promise<Dynamic?> {
+        val p = jsAsyncFoo().then {
+            throw MyThrowable()
+            null
+        }.catch { e ->
+            assert(e.toThrowableOrNull() is MyThrowable)
+            null
+        }
+        return p
+    }
+
+    @Test
+    fun testJsValueToThrowableOrNull2() {
+        val e = MyThrowable()
+        assertEquals((e as Dynamic).toThrowableOrNull(), e)
+    }
+}