Support two levels of smart contract inheritance

src/Stratis.SmartContracts.CLR.Tests/Loader/ContractAssemblyTests.cs

@@ -128,5 +128,34 @@ public Test(ISmartContractState state)
             Assert.NotNull(type);
             Assert.Equal("Test", type.Name);
         }
+
+        [Fact]
+        public void GetDeployedType_TwoLevelsOfInheritance_CorrectType()
+        {
+            var code = @"
+using Stratis.SmartContracts;
+
+public class BaseType : SmartContract
+{
+    public BaseType(ISmartContractState state) : base(state) {}
+}
+
+[Deploy]
+public class InheritedType : BaseType
+{
+    public InheritedType(ISmartContractState state) : base(state) {}
+}
+";
+            var compilation = ContractCompiler.Compile(code);
+
+            var assemblyLoadResult = this.loader.Load((ContractByteCode)compilation.Compilation);
+
+            var contractAssembly = assemblyLoadResult.Value;
+
+            var type = contractAssembly.DeployedType;
+
+            Assert.NotNull(type);
+            Assert.Equal("InheritedType", type.Name);
+        }
     }
 }

src/Stratis.SmartContracts.CLR/Loader/ContractAssembly.cs

@@ -49,12 +49,11 @@ private Type GetDeployedType()
                     x.CustomAttributes.Any(y => y.AttributeType == typeof(DeployAttribute)));
         }
 
-        public static bool IsContractType(Type typeDefinition)
+        private static bool IsContractType(Type typeDefinition)
         {
             return typeDefinition.IsClass &&
                    !typeDefinition.IsAbstract &&
-                   typeDefinition.BaseType != null &&
-                   typeDefinition.BaseType == typeof(SmartContract);
+                   typeDefinition.IsSubclassOf(typeof(SmartContract));
         }
 
         private Type GetObserverType()