Fix js tests

Author: samhill303

build.gradle

@@ -37,7 +37,6 @@ group = GROUP
 version = VERSION_NAME
 
 kotlin {
-    targets {
         jvm()
         js {
             browser()
@@ -56,7 +55,6 @@ kotlin {
         linuxArm32Hfp()
         linuxMips32()
         mingwX64()
-    }
     sourceSets {
         commonMain {
             dependencies {

src/jsMain/kotlin/co/touchlab/testhelp/concurrency/ThreadOperations.kt

@@ -5,15 +5,17 @@ import kotlin.js.Date
 actual class MPWorker actual constructor() {
 
     actual fun <T> runBackground(backJob: () -> T): MPFuture<T> {
-        return MPFuture(backJob())
+        return MPFuture(backJob)
     }
 
     actual fun requestTermination() {
     }
 }
 
-actual class MPFuture<T>(val result: T) {
-    actual fun consume(): T = result
+actual class MPFuture<T>(job: () -> T) {
+    private val result: Result<T> = runCatching(job)
+
+    actual fun consume(): T = result.getOrThrow()
 }
 
 actual fun sleep(time: Long) {