KT-22807: allow asynchronous testing in Kotlin/JS with QUnit

libraries/kotlin.test/js/src/main/kotlin/kotlin/test/FrameworkAdapter.kt

@@ -38,5 +38,5 @@ public external interface FrameworkAdapter {
      * @param ignored whether the test is ignored
      * @param testFn contains test body invocation
      */
-    fun test(name: String, ignored: Boolean, testFn: () -> Any)
+    fun test(name: String, ignored: Boolean, testFn: () -> Any?)
 }

libraries/kotlin.test/js/src/main/kotlin/kotlin/test/adapters/BareAdapter.kt

@@ -18,7 +18,7 @@ internal open class BareAdapter : FrameworkAdapter {
         }
     }
 
-    override fun test(name: String, ignored: Boolean, testFn: () -> Any) {
+    override fun test(name: String, ignored: Boolean, testFn: () -> Any?) {
         if (!ignored) {
             testFn()
         }

libraries/kotlin.test/js/src/main/kotlin/kotlin/test/adapters/Externals.kt

@@ -10,8 +10,8 @@ package kotlin.test.adapters
  */
 internal external object QUnit {
     fun module(name: String, suiteFn: () -> Unit): Unit
-    fun test(name: String, testFn: (dynamic) -> Any): Unit
+    fun test(name: String, testFn: (dynamic) -> Any?): Unit
-    fun skip(name: String, testFn: (dynamic) -> Any): Unit
+    fun skip(name: String, testFn: (dynamic) -> Any?): Unit
 }
 
 /*
@@ -20,8 +20,8 @@ internal external object QUnit {
 
 internal external fun describe(name: String, fn: () -> Unit)
 internal external fun xdescribe(name: String, fn: () -> Unit)
-internal external fun it(name: String, fn: () -> Any)
+internal external fun it(name: String, fn: () -> Any?)
-internal external fun xit(name: String, fn: () -> Any)
+internal external fun xit(name: String, fn: () -> Any?)
 
 internal fun isQUnit() = jsTypeOf(QUnit) !== "undefined"
 

libraries/kotlin.test/js/src/main/kotlin/kotlin/test/adapters/JasmineLikeAdapter.kt

@@ -20,7 +20,7 @@ internal class JasmineLikeAdapter : FrameworkAdapter {
         }
     }
 
-    override fun test(name: String, ignored: Boolean, testFn: () -> Any) {
+    override fun test(name: String, ignored: Boolean, testFn: () -> Any?) {
         if (ignored) {
             xit(name, testFn)
         } else {

libraries/kotlin.test/js/src/main/kotlin/kotlin/test/adapters/QUnitAdapter.kt

@@ -22,7 +22,7 @@ internal class QUnitAdapter : FrameworkAdapter {
         ignoredSuite = prevIgnore
     }
 
-    override fun test(name: String, ignored: Boolean, testFn: () -> Any) {
+    override fun test(name: String, ignored: Boolean, testFn: () -> Any?) {
         if (ignored or ignoredSuite) {
             QUnit.skip(name, wrapTest(testFn))
         } else {
@@ -30,7 +30,7 @@ internal class QUnitAdapter : FrameworkAdapter {
         }
     }
 
-    private fun wrapTest(testFn: () -> Any): (dynamic) -> Any = { assert ->
+    private fun wrapTest(testFn: () -> Any?): (dynamic) -> Any? = { assert ->
         var assertionsHappened = false
         assertHook = { testResult ->
             assertionsHappened = true