Ensured that essence of corruption makes it to the forum template

POEApi.Model.Tests/Files.resx

@@ -133,4 +133,7 @@
   <data name="SampleStashWithRelic" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>testdata\samplestashwithrelic.json;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </data>
+  <data name="SampleStashWithRemnantOfCorruption" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>testdata\samplestashwithremnantofcorruption.json;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </data>
 </root>

POEApi.Model.Tests/IFilterTests.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Linq;
+using System.Text;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Moq;
+using POEApi.Transport;
+using Procurement.ViewModel.Filters;
+using Procurement.ViewModel.Filters.ForumExport;
+using static POEApi.Model.Tests.UnitTestHelper;
+
+namespace POEApi.Model.Tests
+{
+    [TestClass]
+    public class IFilterTests
+    {
+        private Mock<ITransport> _mockTransport;
+        private POEModel _model;
+        private IFilter filter;
+
+        [TestInitialize]
+        public void TestSetup()
+        {
+            _mockTransport = new Mock<ITransport>();
+            _model = new POEModel { Transport = _mockTransport.Object };
+        }
+
+        [TestMethod]
+        public void AreEssencesApplicable()
+        {
+            string fakeStashInfo = Encoding.UTF8.GetString(Files.SampleStashWithRemnantOfCorruption);
+            filter = new EssenceFilter();
+
+            using (var stream = GenerateStreamFromString(fakeStashInfo))
+            {
+                _mockTransport.Setup(m => m.GetStash(0, "", "", false)).Returns(stream);
+
+                var stash = _model.GetStash(0, "", "");
+
+                Assert.IsNotNull(stash);
+
+                var essences = stash.GetItemsByTab(6);
+
+                Assert.IsTrue(essences.All(x => x is Essence));
+
+                //All the items, which are essences in the first place, should make it into the forum template
+                Assert.IsTrue(essences.TrueForAll(filter.Applicable));
+            }
+        }
+    }
+}

POEApi.Model.Tests/POEApi.Model.Tests.csproj

@@ -68,6 +68,8 @@
     </Compile>
     <Compile Include="PoeModelTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="IFilterTests.cs" />
+    <Compile Include="UnitTestHelper.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
@@ -76,6 +78,7 @@
     <None Include="TestData\SampleStash.json" />
     <None Include="TestData\SampleStashWithEssences.json" />
     <None Include="TestData\SampleStashWithRelic.json" />
+    <None Include="TestData\SampleStashWithRemnantOfCorruption.json" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\POEApi.Model\POEApi.Model.csproj">
@@ -86,6 +89,10 @@
       <Project>{5933C062-45EA-4BC3-9AE9-0D6CFC26D505}</Project>
       <Name>POEApi.Transport</Name>
     </ProjectReference>
+    <ProjectReference Include="..\Procurement\Procurement.csproj">
+      <Project>{9369113D-A68F-4FE9-B301-D00C5176666A}</Project>
+      <Name>Procurement</Name>
+    </ProjectReference>
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="Files.resx">

POEApi.Model.Tests/PoeModelTests.cs

@@ -1,10 +1,9 @@
-using System.IO;
-using System.Linq;
-using System.Security.Cryptography.X509Certificates;
+using System.Linq;
 using System.Text;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Moq;
 using POEApi.Transport;
+using static POEApi.Model.Tests.UnitTestHelper;
 
 namespace POEApi.Model.Tests
 {
@@ -126,15 +125,5 @@ public void GetAccountNameTest()
                 Assert.AreEqual(account, "fakeAccountName");
             }
         }
-
-        public Stream GenerateStreamFromString(string s)
-        {
-            var stream = new MemoryStream();
-            var writer = new StreamWriter(stream);
-            writer.Write(s);
-            writer.Flush();
-            stream.Position = 0;
-            return stream;
-        }
     }
 }