Workflow<T> implements IWorkflow<T> again.

Author: SpiritMachine

src/Enflow.Base.Test/WorkflowTests.cs

@@ -56,5 +56,12 @@ public void ThrowsErrorOnInvalidPreBusinessRuleAndDoesNotExecute()
             Assert.Equal(description, message);
             Assert.Equal(0, model.Counter);
         } 
+
+        [Fact]
+        public void WorkflowOfTAssignabletoIWorkflowOfT()
+        {
+            var workflow = new GuidCountIncrementWorkflow(Substitute.For<IStateRule<GuidCount>>());
+            Assert.NotNull(workflow as IWorkflow<GuidCount>);
+        }
     }
 }

src/Enflow.Base/Workflow.cs

@@ -32,9 +32,9 @@ private static void ValidateStateRule(T candidate, IStateRule<T> rule)
             if (rule == null) return;
             if (!rule.IsSatisfied(candidate)) throw new StateRuleException(rule.Description);
         }
-    }
-
-    public abstract class Workflow<T> : Workflow<T, T>
+    }
+
+    public abstract class Workflow<T> : Workflow<T, T>, IWorkflow<T>
     {
         protected Workflow() { }
         protected Workflow(IStateRule<T> preStateRule) : base(preStateRule) { }