Refactor Task

HMCLCore/src/test/java/org/jackhuang/hmcl/util/TaskTest.java

@@ -0,0 +1,18 @@
+package org.jackhuang.hmcl.util;
+
+import org.jackhuang.hmcl.task.Task;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TaskTest {
+    @Test
+    public void testWhenComplete() {
+        Task.composeAsync(() -> Task.allOf(
+                Task.allOf(Task.runAsync(() -> {
+                    throw new Exception();
+                }))
+        )).whenComplete(((isDependentSucceeded, exception) -> {
+            Assert.assertFalse(isDependentSucceeded);
+        })).test();
+    }
+}