Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil.Test/InvalidIdTestHelperTest.cs
===================================================================
diff -u
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil.Test/InvalidIdTestHelperTest.cs	(revision 0)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil.Test/InvalidIdTestHelperTest.cs	(revision 46c6e661ed805f0fe44e3a70e865415cf57f0cf6)
@@ -0,0 +1,54 @@
+// Copyright (C) Stichting Deltares 2017. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+
+namespace Ringtoets.AssemblyTool.IO.TestUtil.Test
+{
+    [TestFixture]
+    public class InvalidIdTestHelperTest
+    {
+        [Test]
+        public void InvalidIdCases_Always_ReturnsExpectedCases()
+        {
+            // Call
+            IEnumerable<TestCaseData> testCases = InvalidIdTestHelper.InvalidIdCases.ToArray();
+
+            // Assert
+            var expectedCases = new[]
+            {
+                new TestCaseData(""),
+                new TestCaseData("   "),
+                new TestCaseData("1nvalidId"),
+                new TestCaseData("invalidId#")
+            };
+
+            int nrOfExpectedCases = expectedCases.Length;
+            Assert.AreEqual(nrOfExpectedCases, testCases.Count());
+            for (var i = 0; i < nrOfExpectedCases; i++)
+            {
+                Assert.AreEqual(expectedCases[i].Arguments[0], testCases.ElementAt(i).Arguments[0]);
+            }
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil.Test/Ringtoets.AssemblyTool.IO.TestUtil.Test.csproj
===================================================================
diff -u -r0aa5b0a377483e4042760e4c88bc6a8dd43570ff -r46c6e661ed805f0fe44e3a70e865415cf57f0cf6
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil.Test/Ringtoets.AssemblyTool.IO.TestUtil.Test.csproj	(.../Ringtoets.AssemblyTool.IO.TestUtil.Test.csproj)	(revision 0aa5b0a377483e4042760e4c88bc6a8dd43570ff)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil.Test/Ringtoets.AssemblyTool.IO.TestUtil.Test.csproj	(.../Ringtoets.AssemblyTool.IO.TestUtil.Test.csproj)	(revision 46c6e661ed805f0fe44e3a70e865415cf57f0cf6)
@@ -7,16 +7,27 @@
   </PropertyGroup>
   <Import Project="$(SolutionDir)\build\Ringtoets_Test.targets" />
   <ItemGroup>
+    <Reference Include="nunit.framework, Version=3.8.1.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
+      <HintPath>..\..\..\..\packages\NUnit.3.8.1\lib\net40\nunit.framework.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="InvalidIdTestHelperTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="..\..\..\..\build\Copying.licenseheader">
       <Link>Copying.licenseheader</Link>
     </None>
+    <None Include="packages.config" />
   </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Ringtoets.AssemblyTool.IO.TestUtil\Ringtoets.AssemblyTool.IO.TestUtil.csproj">
+      <Project>{C7023D25-F8DF-4E3F-BF5D-A8F961CC63F7}</Project>
+      <Name>Ringtoets.AssemblyTool.IO.TestUtil</Name>
+    </ProjectReference>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil.Test/packages.config
===================================================================
diff -u
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil.Test/packages.config	(revision 0)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil.Test/packages.config	(revision 46c6e661ed805f0fe44e3a70e865415cf57f0cf6)
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+Copyright (C) Stichting Deltares 2017. All rights reserved.
+
+This file is part of Ringtoets.
+
+Ringtoets is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+All names, logos, and references to "Deltares" are registered trademarks of
+Stichting Deltares and remain full property of Stichting Deltares at all times.
+All rights reserved.
+-->
+<packages>
+  <package id="NUnit" version="3.8.1" targetFramework="net40" />
+</packages>
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil/InvalidIdTestHelper.cs
===================================================================
diff -u
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil/InvalidIdTestHelper.cs	(revision 0)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil/InvalidIdTestHelper.cs	(revision 46c6e661ed805f0fe44e3a70e865415cf57f0cf6)
@@ -0,0 +1,46 @@
+// Copyright (C) Stichting Deltares 2017. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System.Collections.Generic;
+using NUnit.Framework;
+
+namespace Ringtoets.AssemblyTool.IO.TestUtil
+{
+    /// <summary>
+    /// Class that can be used to generate invalid ids for the serializable components.
+    /// </summary>
+    public static class InvalidIdTestHelper
+    {
+        /// <summary>
+        /// Gets a collection of <see cref="TestCaseData"/> with invalid ids.
+        /// </summary>
+        public static IEnumerable<TestCaseData> InvalidIdCases
+        {
+            get
+            {
+                yield return new TestCaseData("");
+                yield return new TestCaseData("   ");
+                yield return new TestCaseData("1nvalidId");
+                yield return new TestCaseData("invalidId#");
+            }
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil/Ringtoets.AssemblyTool.IO.TestUtil.csproj
===================================================================
diff -u -r2cdd64c04b5525258950cf336810e447bb763740 -r46c6e661ed805f0fe44e3a70e865415cf57f0cf6
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil/Ringtoets.AssemblyTool.IO.TestUtil.csproj	(.../Ringtoets.AssemblyTool.IO.TestUtil.csproj)	(revision 2cdd64c04b5525258950cf336810e447bb763740)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.TestUtil/Ringtoets.AssemblyTool.IO.TestUtil.csproj	(.../Ringtoets.AssemblyTool.IO.TestUtil.csproj)	(revision 46c6e661ed805f0fe44e3a70e865415cf57f0cf6)
@@ -7,6 +7,7 @@
   </PropertyGroup>
   <Import Project="$(SolutionDir)\build\Ringtoets_TestUtil.targets" />
   <ItemGroup>
+    <Compile Include="InvalidIdTestHelper.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="SerializableAttributeTestHelper.cs" />
   </ItemGroup>