Index: Riskeer/Integration/test/Riskeer.Integration.Plugin.Test/ImportInfos/ForeshoreProfilesContextImportInfoTest.cs
===================================================================
diff -u -r79ff4139050f2d5eb2ce2bea4f998a0d4aaa2114 -r0eab9d948d5bd86b8e844769ed0861db9909958a
--- Riskeer/Integration/test/Riskeer.Integration.Plugin.Test/ImportInfos/ForeshoreProfilesContextImportInfoTest.cs	(.../ForeshoreProfilesContextImportInfoTest.cs)	(revision 79ff4139050f2d5eb2ce2bea4f998a0d4aaa2114)
+++ Riskeer/Integration/test/Riskeer.Integration.Plugin.Test/ImportInfos/ForeshoreProfilesContextImportInfoTest.cs	(.../ForeshoreProfilesContextImportInfoTest.cs)	(revision 0eab9d948d5bd86b8e844769ed0861db9909958a)
@@ -39,6 +39,7 @@
 using Riskeer.Common.Forms.PresentationObjects;
 using Riskeer.Common.IO.FileImporters;
 using Riskeer.Integration.Plugin.Properties;
+using Riskeer.Integration.TestUtil;
 
 namespace Riskeer.Integration.Plugin.Test.ImportInfos
 {
@@ -201,10 +202,8 @@
             var assessmentSection = mocks.Stub<IAssessmentSection>();
 
             var mainWindow = mocks.Stub<IMainWindow>();
-            var gui = mocks.Stub<IGui>();
+            IGui gui = StubFactory.CreateGuiStub(mocks);
             gui.Stub(g => g.MainWindow).Return(mainWindow);
-            gui.Stub(g => g.ProjectOpened += null).IgnoreArguments();
-            gui.Stub(g => g.ProjectOpened -= null).IgnoreArguments();
 
             var calculationWithoutOutput = mocks.Stub<ICalculation>();
             calculationWithoutOutput.Stub(calc => calc.HasOutput).Return(false);
@@ -246,10 +245,8 @@
             var assessmentSection = mocks.Stub<IAssessmentSection>();
 
             var mainWindow = mocks.Stub<IMainWindow>();
-            var gui = mocks.Stub<IGui>();
+            IGui gui = StubFactory.CreateGuiStub(mocks);
             gui.Stub(g => g.MainWindow).Return(mainWindow);
-            gui.Stub(g => g.ProjectOpened += null).IgnoreArguments();
-            gui.Stub(g => g.ProjectOpened -= null).IgnoreArguments();
 
             var calculationWithoutOutput = mocks.Stub<ICalculation>();
             calculationWithoutOutput.Stub(calc => calc.HasOutput).Return(true);
Index: Riskeer/Integration/test/Riskeer.Integration.Plugin.Test/ImportInfos/HydraulicBoundaryDatabaseContextImportInfoTest.cs
===================================================================
diff -u -r79ff4139050f2d5eb2ce2bea4f998a0d4aaa2114 -r0eab9d948d5bd86b8e844769ed0861db9909958a
--- Riskeer/Integration/test/Riskeer.Integration.Plugin.Test/ImportInfos/HydraulicBoundaryDatabaseContextImportInfoTest.cs	(.../HydraulicBoundaryDatabaseContextImportInfoTest.cs)	(revision 79ff4139050f2d5eb2ce2bea4f998a0d4aaa2114)
+++ Riskeer/Integration/test/Riskeer.Integration.Plugin.Test/ImportInfos/HydraulicBoundaryDatabaseContextImportInfoTest.cs	(.../HydraulicBoundaryDatabaseContextImportInfoTest.cs)	(revision 0eab9d948d5bd86b8e844769ed0861db9909958a)
@@ -34,6 +34,7 @@
 using Riskeer.Integration.Data;
 using Riskeer.Integration.Forms.PresentationObjects;
 using Riskeer.Integration.IO.Importers;
+using Riskeer.Integration.TestUtil;
 using RiskeerCommonFormsResources = Riskeer.Common.Forms.Properties.Resources;
 
 namespace Riskeer.Integration.Plugin.Test.ImportInfos
@@ -49,10 +50,8 @@
         public void SetUp()
         {
             mocks = new MockRepository();
-            var gui = mocks.Stub<IGui>();
+            IGui gui = StubFactory.CreateGuiStub(mocks);
             gui.Stub(g => g.ViewCommands).Return(mocks.Stub<IViewCommands>());
-            gui.Stub(g => g.ProjectOpened += null).IgnoreArguments();
-            gui.Stub(g => g.ProjectOpened -= null).IgnoreArguments();
             mocks.ReplayAll();
 
             plugin = new RiskeerPlugin
Index: Riskeer/Integration/test/Riskeer.Integration.Plugin.Test/ImportInfos/ReferenceLineContextImportInfoTest.cs
===================================================================
diff -u -rb36b927ea533f0dc445e9f762b407702d499ea29 -r0eab9d948d5bd86b8e844769ed0861db9909958a
--- Riskeer/Integration/test/Riskeer.Integration.Plugin.Test/ImportInfos/ReferenceLineContextImportInfoTest.cs	(.../ReferenceLineContextImportInfoTest.cs)	(revision b36b927ea533f0dc445e9f762b407702d499ea29)
+++ Riskeer/Integration/test/Riskeer.Integration.Plugin.Test/ImportInfos/ReferenceLineContextImportInfoTest.cs	(.../ReferenceLineContextImportInfoTest.cs)	(revision 0eab9d948d5bd86b8e844769ed0861db9909958a)
@@ -32,6 +32,7 @@
 using Riskeer.Common.Data.AssessmentSection;
 using Riskeer.Common.Forms.PresentationObjects;
 using Riskeer.Common.IO.ReferenceLines;
+using Riskeer.Integration.TestUtil;
 using RiskeerCommonFormsResources = Riskeer.Common.Forms.Properties.Resources;
 
 namespace Riskeer.Integration.Plugin.Test.ImportInfos
@@ -47,10 +48,8 @@
         public void SetUp()
         {
             mocks = new MockRepository();
-            var gui = mocks.Stub<IGui>();
+            IGui gui = StubFactory.CreateGuiStub(mocks);
             gui.Stub(g => g.ViewCommands).Return(mocks.Stub<IViewCommands>());
-            gui.Stub(g => g.ProjectOpened += null).IgnoreArguments();
-            gui.Stub(g => g.ProjectOpened -= null).IgnoreArguments();
             mocks.ReplayAll();
 
             plugin = new RiskeerPlugin
Index: Riskeer/Integration/test/Riskeer.Integration.TestUtil/Riskeer.Integration.TestUtil.csproj
===================================================================
diff -u -r48244f68eee25ef1d91701d82e4c4867f0252ffc -r0eab9d948d5bd86b8e844769ed0861db9909958a
--- Riskeer/Integration/test/Riskeer.Integration.TestUtil/Riskeer.Integration.TestUtil.csproj	(.../Riskeer.Integration.TestUtil.csproj)	(revision 48244f68eee25ef1d91701d82e4c4867f0252ffc)
+++ Riskeer/Integration/test/Riskeer.Integration.TestUtil/Riskeer.Integration.TestUtil.csproj	(.../Riskeer.Integration.TestUtil.csproj)	(revision 0eab9d948d5bd86b8e844769ed0861db9909958a)
@@ -25,37 +25,37 @@
     <EmbeddedResource Include="EmbeddedResources\DR6_updated.soil" />
   </ItemGroup>
   <ItemGroup>
-    <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Base\Core.Common.Base.csproj"/>
-    <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Util\Core.Common.Util.csproj"/>
-    <ProjectReference Include="..\..\..\ClosingStructures\src\Riskeer.ClosingStructures.Data\Riskeer.ClosingStructures.Data.csproj"/>
-    <ProjectReference Include="..\..\..\Common\src\Riskeer.Common.Data\Riskeer.Common.Data.csproj"/>
-    <ProjectReference Include="..\..\..\Common\src\Riskeer.Common.IO\Riskeer.Common.IO.csproj"/>
-    <ProjectReference Include="..\..\..\Common\test\Riskeer.Common.Data.TestUtil\Riskeer.Common.Data.TestUtil.csproj"/>
-    <ProjectReference Include="..\..\..\DuneErosion\src\Riskeer.DuneErosion.Data\Riskeer.DuneErosion.Data.csproj"/>
-    <ProjectReference Include="..\..\..\DuneErosion\src\Riskeer.DuneErosion.Plugin\Riskeer.DuneErosion.Plugin.csproj"/>
-    <ProjectReference Include="..\..\..\DuneErosion\test\Riskeer.DuneErosion.Data.TestUtil\Riskeer.DuneErosion.Data.TestUtil.csproj"/>
-    <ProjectReference Include="..\..\..\GrassCoverErosionInwards\src\Riskeer.GrassCoverErosionInwards.Data\Riskeer.GrassCoverErosionInwards.Data.csproj"/>
-    <ProjectReference Include="..\..\..\GrassCoverErosionInwards\test\Riskeer.GrassCoverErosionInwards.Data.TestUtil\Riskeer.GrassCoverErosionInwards.Data.TestUtil.csproj"/>
-    <ProjectReference Include="..\..\..\GrassCoverErosionOutwards\src\Riskeer.GrassCoverErosionOutwards.Data\Riskeer.GrassCoverErosionOutwards.Data.csproj"/>
-    <ProjectReference Include="..\..\..\GrassCoverErosionOutwards\test\Riskeer.GrassCoverErosionOutwards.Data.TestUtil\Riskeer.GrassCoverErosionOutwards.Data.TestUtil.csproj"/>
-    <ProjectReference Include="..\..\..\HeightStructures\src\Riskeer.HeightStructures.Data\Riskeer.HeightStructures.Data.csproj"/>
-    <ProjectReference Include="..\..\..\MacroStabilityInwards\src\Riskeer.MacroStabilityInwards.Data\Riskeer.MacroStabilityInwards.Data.csproj"/>
-    <ProjectReference Include="..\..\..\MacroStabilityInwards\src\Riskeer.MacroStabilityInwards.Plugin\Riskeer.MacroStabilityInwards.Plugin.csproj"/>
-    <ProjectReference Include="..\..\..\MacroStabilityInwards\src\Riskeer.MacroStabilityInwards.Primitives\Riskeer.MacroStabilityInwards.Primitives.csproj"/>
-    <ProjectReference Include="..\..\..\MacroStabilityInwards\test\Riskeer.MacroStabilityInwards.Data.TestUtil\Riskeer.MacroStabilityInwards.Data.TestUtil.csproj"/>
-    <ProjectReference Include="..\..\..\Piping\src\Riskeer.Piping.Data\Riskeer.Piping.Data.csproj"/>
-    <ProjectReference Include="..\..\..\Piping\src\Riskeer.Piping.Plugin\Riskeer.Piping.Plugin.csproj"/>
-    <ProjectReference Include="..\..\..\Piping\src\Riskeer.Piping.Primitives\Riskeer.Piping.Primitives.csproj"/>
-    <ProjectReference Include="..\..\..\Piping\test\Riskeer.Piping.Data.TestUtil\Riskeer.Piping.Data.TestUtil.csproj"/>
-    <ProjectReference Include="..\..\..\Revetment\src\Riskeer.Revetment.Data\Riskeer.Revetment.Data.csproj"/>
-    <ProjectReference Include="..\..\..\StabilityPointStructures\src\Riskeer.StabilityPointStructures.Data\Riskeer.StabilityPointStructures.Data.csproj"/>
-    <ProjectReference Include="..\..\..\StabilityStoneCover\src\Riskeer.StabilityStoneCover.Data\Riskeer.StabilityStoneCover.Data.csproj"/>
-    <ProjectReference Include="..\..\..\StabilityStoneCover\test\Riskeer.StabilityStoneCover.Data.TestUtil\Riskeer.StabilityStoneCover.Data.TestUtil.csproj"/>
-    <ProjectReference Include="..\..\..\WaveImpactAsphaltCover\src\Riskeer.WaveImpactAsphaltCover.Data\Riskeer.WaveImpactAsphaltCover.Data.csproj"/>
-    <ProjectReference Include="..\..\src\Riskeer.Integration.Data\Riskeer.Integration.Data.csproj"/>
-    <ProjectReference Include="..\..\src\Riskeer.Integration.IO\Riskeer.Integration.IO.csproj"/>
-    <ProjectReference Include="..\..\src\Riskeer.Integration.Plugin\Riskeer.Integration.Plugin.csproj"/>
-    <ProjectReference Include="..\..\src\Riskeer.Integration.Service\Riskeer.Integration.Service.csproj"/>
+    <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Base\Core.Common.Base.csproj" />
+    <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Util\Core.Common.Util.csproj" />
+    <ProjectReference Include="..\..\..\ClosingStructures\src\Riskeer.ClosingStructures.Data\Riskeer.ClosingStructures.Data.csproj" />
+    <ProjectReference Include="..\..\..\Common\src\Riskeer.Common.Data\Riskeer.Common.Data.csproj" />
+    <ProjectReference Include="..\..\..\Common\src\Riskeer.Common.IO\Riskeer.Common.IO.csproj" />
+    <ProjectReference Include="..\..\..\Common\test\Riskeer.Common.Data.TestUtil\Riskeer.Common.Data.TestUtil.csproj" />
+    <ProjectReference Include="..\..\..\DuneErosion\src\Riskeer.DuneErosion.Data\Riskeer.DuneErosion.Data.csproj" />
+    <ProjectReference Include="..\..\..\DuneErosion\src\Riskeer.DuneErosion.Plugin\Riskeer.DuneErosion.Plugin.csproj" />
+    <ProjectReference Include="..\..\..\DuneErosion\test\Riskeer.DuneErosion.Data.TestUtil\Riskeer.DuneErosion.Data.TestUtil.csproj" />
+    <ProjectReference Include="..\..\..\GrassCoverErosionInwards\src\Riskeer.GrassCoverErosionInwards.Data\Riskeer.GrassCoverErosionInwards.Data.csproj" />
+    <ProjectReference Include="..\..\..\GrassCoverErosionInwards\test\Riskeer.GrassCoverErosionInwards.Data.TestUtil\Riskeer.GrassCoverErosionInwards.Data.TestUtil.csproj" />
+    <ProjectReference Include="..\..\..\GrassCoverErosionOutwards\src\Riskeer.GrassCoverErosionOutwards.Data\Riskeer.GrassCoverErosionOutwards.Data.csproj" />
+    <ProjectReference Include="..\..\..\GrassCoverErosionOutwards\test\Riskeer.GrassCoverErosionOutwards.Data.TestUtil\Riskeer.GrassCoverErosionOutwards.Data.TestUtil.csproj" />
+    <ProjectReference Include="..\..\..\HeightStructures\src\Riskeer.HeightStructures.Data\Riskeer.HeightStructures.Data.csproj" />
+    <ProjectReference Include="..\..\..\MacroStabilityInwards\src\Riskeer.MacroStabilityInwards.Data\Riskeer.MacroStabilityInwards.Data.csproj" />
+    <ProjectReference Include="..\..\..\MacroStabilityInwards\src\Riskeer.MacroStabilityInwards.Plugin\Riskeer.MacroStabilityInwards.Plugin.csproj" />
+    <ProjectReference Include="..\..\..\MacroStabilityInwards\src\Riskeer.MacroStabilityInwards.Primitives\Riskeer.MacroStabilityInwards.Primitives.csproj" />
+    <ProjectReference Include="..\..\..\MacroStabilityInwards\test\Riskeer.MacroStabilityInwards.Data.TestUtil\Riskeer.MacroStabilityInwards.Data.TestUtil.csproj" />
+    <ProjectReference Include="..\..\..\Piping\src\Riskeer.Piping.Data\Riskeer.Piping.Data.csproj" />
+    <ProjectReference Include="..\..\..\Piping\src\Riskeer.Piping.Plugin\Riskeer.Piping.Plugin.csproj" />
+    <ProjectReference Include="..\..\..\Piping\src\Riskeer.Piping.Primitives\Riskeer.Piping.Primitives.csproj" />
+    <ProjectReference Include="..\..\..\Piping\test\Riskeer.Piping.Data.TestUtil\Riskeer.Piping.Data.TestUtil.csproj" />
+    <ProjectReference Include="..\..\..\Revetment\src\Riskeer.Revetment.Data\Riskeer.Revetment.Data.csproj" />
+    <ProjectReference Include="..\..\..\StabilityPointStructures\src\Riskeer.StabilityPointStructures.Data\Riskeer.StabilityPointStructures.Data.csproj" />
+    <ProjectReference Include="..\..\..\StabilityStoneCover\src\Riskeer.StabilityStoneCover.Data\Riskeer.StabilityStoneCover.Data.csproj" />
+    <ProjectReference Include="..\..\..\StabilityStoneCover\test\Riskeer.StabilityStoneCover.Data.TestUtil\Riskeer.StabilityStoneCover.Data.TestUtil.csproj" />
+    <ProjectReference Include="..\..\..\WaveImpactAsphaltCover\src\Riskeer.WaveImpactAsphaltCover.Data\Riskeer.WaveImpactAsphaltCover.Data.csproj" />
+    <ProjectReference Include="..\..\src\Riskeer.Integration.Data\Riskeer.Integration.Data.csproj" />
+    <ProjectReference Include="..\..\src\Riskeer.Integration.IO\Riskeer.Integration.IO.csproj" />
+    <ProjectReference Include="..\..\src\Riskeer.Integration.Plugin\Riskeer.Integration.Plugin.csproj" />
+    <ProjectReference Include="..\..\src\Riskeer.Integration.Service\Riskeer.Integration.Service.csproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="RhinoMocks">
Index: Riskeer/Integration/test/Riskeer.Integration.TestUtil/StubFactory.cs
===================================================================
diff -u
--- Riskeer/Integration/test/Riskeer.Integration.TestUtil/StubFactory.cs	(revision 0)
+++ Riskeer/Integration/test/Riskeer.Integration.TestUtil/StubFactory.cs	(revision 0eab9d948d5bd86b8e844769ed0861db9909958a)
@@ -0,0 +1,49 @@
+// Copyright (C) Stichting Deltares 2021. All rights reserved.
+//
+// This file is part of Riskeer.
+//
+// Riskeer 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 Core.Gui;
+using Core.Gui.Forms.ViewHost;
+using Rhino.Mocks;
+
+namespace Riskeer.Integration.TestUtil
+{
+    /// <summary>
+    /// Factory for creating stubs.
+    /// </summary>
+    public static class StubFactory
+    {
+        /// <summary>
+        /// Creates a basic stub of <see cref="IGui"/>.
+        /// </summary>
+        /// <param name="mockRepository">The repository to use for creating the stub.</param>
+        /// <returns>The created <see cref="IGui"/> stub.</returns>
+        public static IGui CreateGuiStub(MockRepository mockRepository)
+        {
+            var gui = mockRepository.Stub<IGui>();
+
+            gui.Stub(g => g.ProjectOpened += null).IgnoreArguments();
+            gui.Stub(g => g.ProjectOpened -= null).IgnoreArguments();
+            gui.Stub(g => g.ViewHost).Return(mockRepository.Stub<IViewHost>());
+
+            return gui;
+        }
+    }
+}
\ No newline at end of file