Merge pull request dotnet-state-machine#570 from RLittlesII/feature/f…

…ireasync/trigger

feature: Add FireAsync(TTrigger, params object[]) overload

src/Stateless/StateMachine.Async.cs

@@ -46,6 +46,19 @@ public Task FireAsync(TTrigger trigger)
             return InternalFireAsync(trigger, new object[0]);
         }
 
+        /// <summary>
+        /// Transition from the current state via the specified trigger in async fashion.
+        /// The target state is determined by the configuration of the current state.
+        /// Actions associated with leaving the current state and entering the new one
+        /// will be invoked.
+        /// </summary>
+        /// <param name="trigger">The trigger to fire.</param>
+        /// <param name="args">A variable-length parameters list containing arguments. </param>
+        public Task FireAsync(TTrigger trigger, params object[] args)
+        {
+            return InternalFireAsync(trigger, args);
+        }
+
         /// <summary>
         /// Transition from the current state via the specified trigger in async fashion.
         /// The target state is determined by the configuration of the current state.

test/Stateless.Tests/AsyncActionsFixture.cs

@@ -541,6 +541,29 @@ public async Task OnEntryFromAsync_WhenEnteringByAnotherTrigger_InvokesAction()
             Assert.False(wasInvoked);
         }
 
+        [Fact]
+        public async Task FireAsyncTriggerWithParametersArray()
+        {
+            const string expectedParam = "42-Stateless-True-420.69-Y";
+            string actualParam = null;
+
+            var sm = new StateMachine<State, Trigger>(State.A);
+
+            sm.Configure(State.A)
+                .Permit(Trigger.X, State.B);
+
+            sm.Configure(State.B)
+                .OnEntryAsync(t =>
+                {
+                    actualParam = string.Join("-", t.Parameters);
+                    return Task.CompletedTask;
+                });
+
+            await sm.FireAsync(Trigger.X, 42, "Stateless", true, 420.69, Trigger.Y);
+
+            Assert.Equal(expectedParam, actualParam);
+        }
+
         [Fact]
         public async Task FireAsync_TriggerWithMoreThanThreeParameters()
         {