Index: Core/Components/test/Core.Components.BruTile.Test/Configurations/WellKnownTileSourceLayerConfigurationTest.cs
===================================================================
diff -u -rd95413945eef87315850dbd426cdf8dcf81d4493 -r3204fdab2e01e8fcb73ca38d74adfde8fa8d369a
--- Core/Components/test/Core.Components.BruTile.Test/Configurations/WellKnownTileSourceLayerConfigurationTest.cs	(.../WellKnownTileSourceLayerConfigurationTest.cs)	(revision d95413945eef87315850dbd426cdf8dcf81d4493)
+++ Core/Components/test/Core.Components.BruTile.Test/Configurations/WellKnownTileSourceLayerConfigurationTest.cs	(.../WellKnownTileSourceLayerConfigurationTest.cs)	(revision 3204fdab2e01e8fcb73ca38d74adfde8fa8d369a)
@@ -23,6 +23,7 @@
 using BruTile;
 using BruTile.Predefined;
 using Core.Common.Gui.TestUtil.Settings;
+using Core.Common.TestUtil;
 using Core.Components.BruTile.Configurations;
 using Core.Components.BruTile.IO;
 using Core.Components.BruTile.TestUtil;
@@ -34,6 +35,9 @@
     [TestFixture]
     public class WellKnownTileSourceLayerConfigurationTest
     {
+        private DirectoryDisposeHelper directoryDisposeHelper;
+        private TestSettingsHelper testSettingsHelper;
+
         [Test]
         public void CreateInitializedConfiguration_InvalidKnownTileSource_ThrowNotSupportedException()
         {
@@ -77,7 +81,7 @@
         public void GivenAllAvailableKnownTileSources_WhenCreatingInitializedConfiguration_ThenConfigurationHasExpectedValues()
         {
             // Given
-            using (new UseCustomSettingsHelper(new TestSettingsHelper()))
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(new WellKnownTileSourceMapData(WellKnownTileSource.BingAerial)))
             {
                 foreach (KnownTileSource knownTileSource in Enum.GetValues(typeof(KnownTileSource)))
@@ -100,7 +104,7 @@
         {
             // Setup
             const KnownTileSource knownTileSource = KnownTileSource.BingAerial;
-            using (new UseCustomSettingsHelper(new TestSettingsHelper()))
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(new WellKnownTileSourceMapData(WellKnownTileSource.BingAerial)))
             using (WellKnownTileSourceLayerConfiguration configuration = WellKnownTileSourceLayerConfiguration.CreateInitializedConfiguration(knownTileSource))
             {
@@ -124,7 +128,7 @@
         public void Clone_ConfigurationDisposed_ThrowObjectDisposedException()
         {
             // Setup
-            using (new UseCustomSettingsHelper(new TestSettingsHelper()))
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(new WellKnownTileSourceMapData(WellKnownTileSource.BingAerial)))
             {
                 WellKnownTileSourceLayerConfiguration configuration = WellKnownTileSourceLayerConfiguration.CreateInitializedConfiguration(KnownTileSource.BingAerial);
@@ -143,7 +147,7 @@
         public void Initialize_InitializedTrue()
         {
             // Setup
-            using (new UseCustomSettingsHelper(new TestSettingsHelper()))
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(new WellKnownTileSourceMapData(WellKnownTileSource.BingAerial)))
             using (WellKnownTileSourceLayerConfiguration configuration = WellKnownTileSourceLayerConfiguration.CreateInitializedConfiguration(KnownTileSource.BingAerial))
             {
@@ -163,7 +167,7 @@
         public void Initialize_ConfigurationDisposed_ThrowObjectDisposedException()
         {
             // Setup
-            using (new UseCustomSettingsHelper(new TestSettingsHelper()))
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(new WellKnownTileSourceMapData(WellKnownTileSource.BingAerial)))
             {
                 WellKnownTileSourceLayerConfiguration configuration = WellKnownTileSourceLayerConfiguration.CreateInitializedConfiguration(KnownTileSource.BingAerial);
@@ -178,6 +182,23 @@
             }
         }
 
+        [OneTimeSetUp]
+        public void OneTimeSetUp()
+        {
+            testSettingsHelper = new TestSettingsHelper
+            {
+                ApplicationLocalUserSettingsDirectory = TestHelper.GetScratchPadPath(nameof(WellKnownTileSourceLayerConfigurationTest))
+            };
+
+            directoryDisposeHelper = new DirectoryDisposeHelper(TestHelper.GetScratchPadPath(), nameof(WellKnownTileSourceLayerConfigurationTest));
+        }
+
+        [OneTimeTearDown]
+        public void OneTimeTearDown()
+        {
+            directoryDisposeHelper.Dispose();
+        }
+
         private static TestCaseData[] ValidWellKnownTileSourceToCorrespondingKnownTileSource()
         {
             return new[]
Index: Core/Components/test/Core.Components.BruTile.Test/Configurations/WmtsLayerConfigurationTest.cs
===================================================================
diff -u -r99f9004206bfb9de084275d749b7aeccafd6da18 -r3204fdab2e01e8fcb73ca38d74adfde8fa8d369a
--- Core/Components/test/Core.Components.BruTile.Test/Configurations/WmtsLayerConfigurationTest.cs	(.../WmtsLayerConfigurationTest.cs)	(revision 99f9004206bfb9de084275d749b7aeccafd6da18)
+++ Core/Components/test/Core.Components.BruTile.Test/Configurations/WmtsLayerConfigurationTest.cs	(.../WmtsLayerConfigurationTest.cs)	(revision 3204fdab2e01e8fcb73ca38d74adfde8fa8d369a)
@@ -23,6 +23,7 @@
 using System.Linq;
 using BruTile;
 using BruTile.Web;
+using Core.Common.Gui.TestUtil.Settings;
 using Core.Common.TestUtil;
 using Core.Components.BruTile.Configurations;
 using Core.Components.BruTile.TestUtil;
@@ -37,12 +38,14 @@
     public class WmtsLayerConfigurationTest
     {
         private const string validPreferredFormat = "image/png";
+        private DirectoryDisposeHelper directoryDisposeHelper;
+        private TestSettingsHelper testSettingsHelper;
 
         [Test]
         public void CreateInitializedConfiguration_CapabilitiesUrlNull_ThrowArgumentNullException()
         {
             // Call
-            TestDelegate call = () => WmtsLayerConfiguration.CreateInitializedConfiguration(null, "A", "images/png");
+            TestDelegate call = () => WmtsLayerConfiguration.CreateInitializedConfiguration(null, "A", validPreferredFormat);
 
             // Assert
             string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
@@ -53,7 +56,7 @@
         public void CreateInitializedConfiguration_CapabilityIdNull_ThrowArgumentNullException()
         {
             // Call
-            TestDelegate call = () => WmtsLayerConfiguration.CreateInitializedConfiguration("A", null, "images/png");
+            TestDelegate call = () => WmtsLayerConfiguration.CreateInitializedConfiguration("A", null, validPreferredFormat);
 
             // Assert
             string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
@@ -94,6 +97,7 @@
             factory.Stub(f => f.GetWmtsTileSources(url)).Return(Enumerable.Empty<ITileSource>());
             mocks.ReplayAll();
 
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(factory))
             {
                 // Call
@@ -129,6 +133,7 @@
             factory.Stub(f => f.GetWmtsTileSources(targetMapData.SourceCapabilitiesUrl)).Return(tileSources);
             mocks.ReplayAll();
 
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(factory))
             {
                 // Call
@@ -164,6 +169,7 @@
             factory.Stub(f => f.GetWmtsTileSources(targetMapData.SourceCapabilitiesUrl)).Return(tileSources);
             mocks.ReplayAll();
 
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(factory))
             using (WmtsLayerConfiguration configuration = WmtsLayerConfiguration.CreateInitializedConfiguration(targetMapData.SourceCapabilitiesUrl,
                                                                                                                 targetMapData.SelectedCapabilityIdentifier,
@@ -202,6 +208,7 @@
             factory.Stub(f => f.GetWmtsTileSources(targetMapData.SourceCapabilitiesUrl)).Return(tileSources);
             mocks.ReplayAll();
 
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(factory))
             {
                 WmtsLayerConfiguration configuration = WmtsLayerConfiguration.CreateInitializedConfiguration(targetMapData.SourceCapabilitiesUrl,
@@ -238,6 +245,7 @@
             factory.Stub(f => f.GetWmtsTileSources(targetMapData.SourceCapabilitiesUrl)).Return(tileSources);
             mocks.ReplayAll();
 
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(factory))
             using (WmtsLayerConfiguration configuration = WmtsLayerConfiguration.CreateInitializedConfiguration(targetMapData.SourceCapabilitiesUrl,
                                                                                                                 targetMapData.SelectedCapabilityIdentifier,
@@ -274,6 +282,7 @@
             factory.Stub(f => f.GetWmtsTileSources(targetMapData.SourceCapabilitiesUrl)).Return(tileSources);
             mocks.ReplayAll();
 
+            using (new UseCustomSettingsHelper(testSettingsHelper))
             using (new UseCustomTileSourceFactoryConfig(factory))
             {
                 WmtsLayerConfiguration configuration = WmtsLayerConfiguration.CreateInitializedConfiguration(targetMapData.SourceCapabilitiesUrl,
@@ -290,5 +299,22 @@
             }
             mocks.VerifyAll();
         }
+
+        [OneTimeSetUp]
+        public void OneTimeSetUp()
+        {
+            testSettingsHelper = new TestSettingsHelper
+            {
+                ApplicationLocalUserSettingsDirectory = TestHelper.GetScratchPadPath(nameof(WellKnownTileSourceLayerConfigurationTest))
+            };
+
+            directoryDisposeHelper = new DirectoryDisposeHelper(TestHelper.GetScratchPadPath(), nameof(WellKnownTileSourceLayerConfigurationTest));
+        }
+
+        [OneTimeTearDown]
+        public void OneTimeTearDown()
+        {
+            directoryDisposeHelper.Dispose();
+        }
     }
 }
\ No newline at end of file