Added untracked files

Filtration.ObjectModel.Tests/TestItemFilterBlockGroup.cs

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+using NUnit.Framework;
+
+namespace Filtration.ObjectModel.Tests
+{
+    [TestFixture]
+    public class TestItemFilterBlockGroup
+    {
+        [Test]
+        public void ToString_ReturnsFullBlockHierarchy()
+        {
+            // Arrange
+            const string ExpectedResult = "Child 1 Block Group - Child 2 Block Group";
+
+            var rootBlockGroup = new ItemFilterBlockGroup("Root Block Group", null);
+            var child1BlockGroup = new ItemFilterBlockGroup("Child 1 Block Group", rootBlockGroup);
+            var child2BlockGroup = new ItemFilterBlockGroup("Child 2 Block Group", child1BlockGroup);
+            
+            // Act
+            var result = child2BlockGroup.ToString();
+
+            // Assert
+            Assert.AreEqual(ExpectedResult, result);
+        }
+        
+        [Test]
+        public void ToString_AddsTildeForAdvancedBlock()
+        {
+            // Arrange
+            const string ExpectedResult = "~Child 1 Block Group - Child 2 Block Group";
+
+            var rootBlockGroup = new ItemFilterBlockGroup("Root Block Group", null);
+            var child1BlockGroup = new ItemFilterBlockGroup("Child 1 Block Group", rootBlockGroup, true);
+            var child2BlockGroup = new ItemFilterBlockGroup("Child 2 Block Group", child1BlockGroup);
+
+            // Act
+            var result = child2BlockGroup.ToString();
+
+            // Assert
+            Assert.AreEqual(ExpectedResult, result);
+        }
+    }
+}

Filtration.ObjectModel.Tests/packages.config

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+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Moq" version="4.2.1506.2016" targetFramework="net451" />
+  <package id="NUnit" version="2.6.4" targetFramework="net451" />
+</packages>