add step title factory tests

Author: Gurpreet Singh

src/TestStack.BDDfy.Tests/Scanner/FluentScanner/UsingCustomStepTitleFactory.cs

@@ -0,0 +1,75 @@
+using Shouldly;
+using System.Linq;
+using System.Reflection;
+using TestStack.BDDfy.Abstractions;
+using TestStack.BDDfy.Configuration;
+using Xunit;
+
+namespace TestStack.BDDfy.Tests.Scanner.FluentScanner
+{
+    public class UsingCustomStepTitleFactory
+    {
+        private class CustomStepTitleFactory : IStepTitleFactory
+        {
+            public StepTitle Create(
+                string stepTextTemplate,
+                bool includeInputsInStepTitle,
+                MethodInfo methodInfo,
+                StepArgument[] inputArguments,
+                ITestContext testContext,
+                string stepPrefix) => new StepTitle("Custom Step Title");
+
+            public StepTitle Create(string title, string stepPrefix, ITestContext testContext) => new StepTitle(title);
+        }
+
+        [Fact]
+        public void ShouldUseCustomStepTitleFactoryWhenSet()
+        {
+            var scenario = new UsingCustomStepTitleFactory();
+            var configurator = TestContext.GetContext(scenario).Configurator;
+            configurator.StepTitleFactory = new CustomStepTitleFactory();
+
+            var story = scenario
+                .Given(_ => SomeState())
+                .When(_ => SomethingHappens())
+                .Then(_ => SomeResult())
+                .BDDfy();
+
+            story.Scenarios.Single().Steps.ElementAt(0).Title.ShouldBe("Custom Step Title");
+            story.Scenarios.Single().Steps.ElementAt(1).Title.ShouldBe("Custom Step Title");
+            story.Scenarios.Single().Steps.ElementAt(2).Title.ShouldBe("Custom Step Title");
+        }
+
+        [Fact]
+        public void ShouldUseCustomStepTitleFactoryWhenSetWithStepTitles()
+        {
+            var scenario = new UsingCustomStepTitleFactory();
+            var configurator = TestContext.GetContext(scenario).Configurator;
+            configurator.StepTitleFactory = new CustomStepTitleFactory();
+            var story = scenario
+                .Given(_ => SomeState(), "Not this")
+                .When(_ => SomethingHappens(), "Or this")
+                .Then(_ => SomeResult(), "should not appear")
+                .BDDfy();
+
+            story.Scenarios.Single().Steps.ElementAt(0).Title.ShouldBe("Custom Step Title");
+            story.Scenarios.Single().Steps.ElementAt(1).Title.ShouldBe("Custom Step Title");
+            story.Scenarios.Single().Steps.ElementAt(2).Title.ShouldBe("Custom Step Title");
+        }
+
+        [StepTitle("given from attribute")]
+        private void SomeState()
+        {
+        }
+
+        [StepTitle("when from attribute")]
+        private void SomethingHappens()
+        {
+        }
+
+        [StepTitle("then from attribute")]
+        private void SomeResult()
+        {
+        }
+    }
+}