Allow to convert type to same type or one of base types with StepArgumentTransformation

TechTalk.SpecFlow/Bindings/StepArgumentTypeConverter.cs

@@ -44,14 +44,15 @@ protected virtual IStepArgumentTransformationBinding GetMatchingStepTransformati
         public object Convert(object value, IBindingType typeToConvertTo, CultureInfo cultureInfo)
         {
             if (value == null) throw new ArgumentNullException("value");
-
-            if (typeToConvertTo == value.GetType())
-                return value;
-
+
             var stepTransformation = GetMatchingStepTransformation(value, typeToConvertTo, true);
             if (stepTransformation != null)
                 return DoTransform(stepTransformation, value, cultureInfo);
 
+            var convertToType = typeToConvertTo as RuntimeBindingType;
+            if (convertToType != null && convertToType.Type.IsAssignableFrom(value.GetType()))
+                return value;
+
             return ConvertSimple(typeToConvertTo, value, cultureInfo);
         }
 
@@ -79,15 +80,16 @@ private object[] GetStepTransformationArgumentsFromRegex(IStepArgumentTransforma
 
         public bool CanConvert(object value, IBindingType typeToConvertTo, CultureInfo cultureInfo)
         {
-            if (value == null) throw new ArgumentNullException("value");
-
-            if (typeToConvertTo == value.GetType())
-                return true;
+            if (value == null) throw new ArgumentNullException("value");           
 
             var stepTransformation = GetMatchingStepTransformation(value, typeToConvertTo, false);
             if (stepTransformation != null)
                 return true;
 
+            var convertToType = typeToConvertTo as RuntimeBindingType;
+            if (convertToType != null && convertToType.Type.IsAssignableFrom(value.GetType()))
+                return true;
+
             return CanConvertSimple(typeToConvertTo, value, cultureInfo);
         }
 

TechTalk.SpecFlow/Infrastructure/TestExecutionEngine.cs

@@ -436,10 +436,7 @@ private object ConvertArg(object value, IBindingType typeToConvertTo)
         {
             Debug.Assert(value != null);
             Debug.Assert(typeToConvertTo != null);
-
-            if (typeToConvertTo.IsAssignableTo(value.GetType()))
-                return value;
-
+
             return stepArgumentTypeConverter.Convert(value, typeToConvertTo, FeatureContext.BindingCulture);
         }
 

Tests/TechTalk.SpecFlow.RuntimeTests/StepExecutionTestsWithConversions.cs

@@ -30,7 +30,7 @@ public static object Convert(this IStepArgumentTypeConverter converter, object v
                 Arg<string>.Is.Equal(argument),
                 Arg<IBindingType>.Matches(bt => bt.TypeEquals(type)), 
                 Arg<CultureInfo>.Is.Anything);
-        }
+        }     
     }
 
     [Binding]
@@ -148,6 +148,7 @@ public void ShouldCallTheOnlyThatCanConvertWithTable()
             StepArgumentTypeConverterStub.Stub(LegacyStepArgumentTypeConverterExtensions.GetCanConvertMethodFilter("argument", typeof(double))).Return(true);
             StepArgumentTypeConverterStub.Stub(c => c.CanConvert(null, null, null)).IgnoreArguments().Return(false);
 
+            StepArgumentTypeConverterStub.Expect(LegacyStepArgumentTypeConverterExtensions.GetConvertMethodFilter(table, typeof(Table))).Return(table);
             StepArgumentTypeConverterStub.Expect(LegacyStepArgumentTypeConverterExtensions.GetConvertMethodFilter("argument", typeof(double))).Return(1.23);
             bindingInstance.Expect(b => b.DoubleArgWithTable(1.23, table));
 

Tests/TechTalk.SpecFlow.RuntimeTests/StepExecutionTestsWithConversionsForTables.cs

@@ -65,13 +65,15 @@ public void ShouldCallTheUserConverterToConvertTableWithTableAndMultilineArg()
 
             Table table = new Table("h1");
             var user = new User();
-
+            var multiLineArg = "multi-line arg";
             // return false unless its a User
-            StepArgumentTypeConverterStub.Stub(LegacyStepArgumentTypeConverterExtensions.GetCanConvertMethodFilter(table, typeof(User))).Return(true);
+            StepArgumentTypeConverterStub.Stub(LegacyStepArgumentTypeConverterExtensions.GetCanConvertMethodFilter(table, typeof(User))).Return(true);            
             StepArgumentTypeConverterStub.Stub(c => c.CanConvert(null, null, null)).IgnoreArguments().Return(false);
+            StepArgumentTypeConverterStub.Stub(LegacyStepArgumentTypeConverterExtensions.GetConvertMethodFilter(multiLineArg, typeof(string))).Return(multiLineArg);
             StepArgumentTypeConverterStub.Stub(LegacyStepArgumentTypeConverterExtensions.GetConvertMethodFilter(table, typeof(User))).Return(user);
+
 
-            var multiLineArg = "multi-line arg";
+
             bindingInstance.Expect(b => b.MultilineArgumentAndTable(multiLineArg, user));
             MockRepository.ReplayAll();
 
@@ -90,14 +92,16 @@ public void ShouldCallTheUserConverterToConvertTableWithTableAndMultilineArgAndP
             Table table = new Table("h1");
             string argumentValue = "argument";
             var user = new User();
-
+            var multiLineArg = "multi-line arg";
             // return false unless its a User
             // must also stub CanConvert & Convert for the string argument as we've introduced a parameter
             StepArgumentTypeConverterStub.Stub(LegacyStepArgumentTypeConverterExtensions.GetCanConvertMethodFilter(table, typeof(User))).Return(true);
             StepArgumentTypeConverterStub.Stub(c => c.CanConvert(null, null, null)).IgnoreArguments().Return(false);
             StepArgumentTypeConverterStub.Stub(LegacyStepArgumentTypeConverterExtensions.GetConvertMethodFilter(table, typeof(User))).Return(user);
+            StepArgumentTypeConverterStub.Stub(LegacyStepArgumentTypeConverterExtensions.GetConvertMethodFilter(argumentValue, typeof(string))).Return(argumentValue);
+            StepArgumentTypeConverterStub.Stub(LegacyStepArgumentTypeConverterExtensions.GetConvertMethodFilter(multiLineArg, typeof(string))).Return(multiLineArg);
 
-            var multiLineArg = "multi-line arg";
+
             bindingInstance.Expect(b => b.ParameterMultilineArgumentAndTable(argumentValue, multiLineArg, user));
             MockRepository.ReplayAll();
 

Tests/TechTalk.SpecFlow.RuntimeTests/StepTransformationTests.cs

@@ -37,6 +37,32 @@ public IEnumerable<User> CreateUsers(Table table)
         }
     }
 
+    [Binding]
+    public class TypeToTypeConverter
+    {
+        [StepArgumentTransformation("string (w+)")]
+        public string StringToStringConvertRegex(string value)
+        {
+            return string.Concat("prefix ", value);
+        }
+
+        [StepArgumentTransformation]
+        public string StringToStringConvert(string value)
+        {
+            return string.Concat("prefix ", value);
+        }
+
+        [StepArgumentTransformation]
+        public Table TableToTableConvert(Table table)
+        {
+            var transformedTable = new List<string>();
+            transformedTable.Add("transformed column");
+            transformedTable.AddRange(table.Header);
+
+            return new Table(transformedTable.ToArray());
+        }
+    }
+
     [TestFixture]
     public class StepTransformationTests
     {
@@ -80,6 +106,53 @@ public void UserConverterShouldConvertStringToUser()
             Assert.NotNull(result);
             Assert.That(result.GetType(), Is.EqualTo(typeof(User)));
             Assert.That(((User)result).Name, Is.EqualTo("xyz"));
+        }
+
+        [Test]
+        public void TypeToTypeConverterShouldConvertStringToStringUsingRegex()
+        {
+            TypeToTypeConverter stepTransformationInstance = new TypeToTypeConverter();
+            var transformMethod = stepTransformationInstance.GetType().GetMethod("StringToStringConvertRegex");
+            var stepTransformationBinding = CreateStepTransformationBinding(@"string (\w+)", transformMethod);
+
+            Assert.True(stepTransformationBinding.Regex.IsMatch("string xyz"));
+
+            var invoker = new BindingInvoker(ConfigurationLoader.GetDefault(), new Mock<IErrorProvider>().Object);
+            TimeSpan duration;
+            var result = invoker.InvokeBinding(stepTransformationBinding, contextManagerStub.Object, new object[] { "xyz" }, new Mock<ITestTracer>().Object, out duration);
+            Assert.NotNull(result);
+            Assert.That(result.GetType(), Is.EqualTo(typeof(string)));
+            Assert.That(((string)result), Is.EqualTo("prefix xyz"));
+        }
+
+        [Test]
+        public void TypeToTypeConverterShouldConvertStringToString()
+        {
+            TypeToTypeConverter stepTransformationInstance = new TypeToTypeConverter();
+            var transformMethod = stepTransformationInstance.GetType().GetMethod("StringToStringConvert");
+            var stepTransformationBinding = CreateStepTransformationBinding(@"", transformMethod);
+
+            var invoker = new BindingInvoker(ConfigurationLoader.GetDefault(), new Mock<IErrorProvider>().Object);
+            TimeSpan duration;
+            var result = invoker.InvokeBinding(stepTransformationBinding, contextManagerStub.Object, new object[] { "xyz" }, new Mock<ITestTracer>().Object, out duration);
+            Assert.NotNull(result);
+            Assert.That(result.GetType(), Is.EqualTo(typeof(string)));
+            Assert.That(((string)result), Is.EqualTo("prefix xyz"));
+        }
+
+        [Test]
+        public void TypeToTypeConverterShouldConvertTableToTable()
+        {
+            TypeToTypeConverter stepTransformationInstance = new TypeToTypeConverter();
+            var transformMethod = stepTransformationInstance.GetType().GetMethod("TableToTableConvert");
+            var stepTransformationBinding = CreateStepTransformationBinding(@"", transformMethod);
+
+            var invoker = new BindingInvoker(ConfigurationLoader.GetDefault(), new Mock<IErrorProvider>().Object);
+            TimeSpan duration;
+            var result = invoker.InvokeBinding(stepTransformationBinding, contextManagerStub.Object, new object[] { new Table("h1") }, new Mock<ITestTracer>().Object, out duration);
+            Assert.NotNull(result);
+            Assert.That(result.GetType(), Is.EqualTo(typeof(Table)));
+            Assert.That(((Table)result).Header, Is.EqualTo(new string[] { "transformed column", "h1" }));
         }
 
         [Test]

changelog.txt

@@ -1,8 +1,13 @@
 2.4 - 2018-??-??
+New Features:
++ Added ability to convert type to same type or one of the base types https://github.com/techtalk/SpecFlow/pull/1110
+
+
 Fixes:
 + Expose ScenarioInfo.Description parameter to get from context https://github.com/techtalk/SpecFlow/pull/1078
 + Resolved loading plugins multiple times. Issue: https://github.com/techtalk/SpecFlow/issues/888 
 
+
 2.3.2 - 2018-04-17
 Fixes:
 + Fix issue when using environment variables in a generator plugin's path https://github.com/techtalk/SpecFlow/pull/1045