Making the alter proxy test/example a bit more realistic

Author: robdmoore

NTestDataBuilder.Tests/AsProxyTests.cs

@@ -21,11 +21,13 @@ public void GivenBuilderIsSetAsProxy_WhenBuilding_AnNSubstituteProxyIsReturned()
         [Test]
         public void GivenBuilderThatAltersProxyIsSetAsProxy_WhenBuilding_TheProxyIsAltered()
         {
-            var builder = new ProxyAlteringCustomerBuilder().AsProxy();
+            var builder = new ProxyAlteringCustomerBuilder()
+                .AsProxy()
+                .HasBeenMemberForYears(10);
 
             var proxy = builder.Build();
 
-            Assert.That(proxy.CustomerForHowManyYears(DateTime.Now), Is.EqualTo(ProxyAlteringCustomerBuilder.MemberFor));
+            Assert.That(proxy.CustomerForHowManyYears(DateTime.Now), Is.EqualTo(10));
         }
     }
 }

NTestDataBuilder.Tests/Builders/ProxyAlteringCustomerBuilder.cs

@@ -6,11 +6,17 @@ namespace NTestDataBuilder.Tests.Builders
 {
     class ProxyAlteringCustomerBuilder : DataBuilder<Customer, ProxyAlteringCustomerBuilder>
     {
-        public const int MemberFor = 4;
+        private int _years;
+
+        public ProxyAlteringCustomerBuilder HasBeenMemberForYears(int years)
+        {
+            _years = years;
+            return this;
+        }
 
         protected override void AlterProxy(Customer proxy)
         {
-            proxy.CustomerForHowManyYears(Arg.Any<DateTime>()).Returns(MemberFor);
+            proxy.CustomerForHowManyYears(Arg.Any<DateTime>()).Returns(_years);
         }
 
         protected override Customer BuildObject()