Added extra tests.

Author: dlemstra

tests/Magick.NET.Tests/MagickNETTests/TheSetFontConfigDirectoryMethod.cs

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+// Copyright 2013-2020 Dirk Lemstra <https://github.com/dlemstra/Magick.NET/>
+//
+// Licensed under the ImageMagick License (the "License"); you may not use this file except in
+// compliance with the License. You may obtain a copy of the License at
+//
+//   https://www.imagemagick.org/script/license.php
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the
+// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+// either express or implied. See the License for the specific language governing permissions
+// and limitations under the License.
+
+using System;
+using ImageMagick;
+using Xunit;
+
+namespace Magick.NET.Tests
+{
+    public partial class MagickNETTests
+    {
+        public class TheSetFontConfigDirectoryMethod
+        {
+            [Fact]
+            public void ShouldThrowExceptionWhenPathIsNull()
+            {
+                Assert.Throws<ArgumentNullException>("path", () =>
+                {
+                    MagickNET.SetFontConfigDirectory(null);
+                });
+            }
+
+            [Fact]
+            public void ShouldThrowExceptionWhenPathIsInvalid()
+            {
+                Assert.Throws<ArgumentException>("path", () =>
+                {
+                    MagickNET.SetFontConfigDirectory("Invalid");
+                });
+            }
+        }
+    }
+}

tests/Magick.NET.Tests/MagickNETTests/TheSetGhostscriptDirectoryMethod.cs

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+// Copyright 2013-2020 Dirk Lemstra <https://github.com/dlemstra/Magick.NET/>
+//
+// Licensed under the ImageMagick License (the "License"); you may not use this file except in
+// compliance with the License. You may obtain a copy of the License at
+//
+//   https://www.imagemagick.org/script/license.php
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the
+// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+// either express or implied. See the License for the specific language governing permissions
+// and limitations under the License.
+
+using System;
+using ImageMagick;
+using Xunit;
+
+namespace Magick.NET.Tests
+{
+    public partial class MagickNETTests
+    {
+        public class TheSetGhostscriptDirectoryMethod
+        {
+            [Fact]
+            public void ShouldThrowExceptionWhenPathIsNull()
+            {
+                Assert.Throws<ArgumentNullException>("path", () =>
+                {
+                    MagickNET.SetGhostscriptDirectory(null);
+                });
+            }
+
+            [Fact]
+            public void ShouldThrowExceptionWhenPathIsInvalid()
+            {
+                Assert.Throws<ArgumentException>("path", () =>
+                {
+                    MagickNET.SetGhostscriptDirectory("Invalid");
+                });
+            }
+        }
+    }
+}

tests/Magick.NET.Tests/MagickNETTests/TheSetGhostscriptFontDirectoryMethod.cs

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+// Copyright 2013-2020 Dirk Lemstra <https://github.com/dlemstra/Magick.NET/>
+//
+// Licensed under the ImageMagick License (the "License"); you may not use this file except in
+// compliance with the License. You may obtain a copy of the License at
+//
+//   https://www.imagemagick.org/script/license.php
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the
+// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+// either express or implied. See the License for the specific language governing permissions
+// and limitations under the License.
+
+using System;
+using ImageMagick;
+using Xunit;
+
+namespace Magick.NET.Tests
+{
+    public partial class MagickNETTests
+    {
+        public class TheSetGhostscriptFontDirectoryMethod
+        {
+            [Fact]
+            public void ShouldThrowExceptionWhenPathIsNull()
+            {
+                Assert.Throws<ArgumentNullException>("path", () =>
+                {
+                    MagickNET.SetGhostscriptFontDirectory(null);
+                });
+            }
+
+            [Fact]
+            public void ShouldThrowExceptionWhenPathIsInvalid()
+            {
+                Assert.Throws<ArgumentException>("path", () =>
+                {
+                    MagickNET.SetGhostscriptFontDirectory("Invalid");
+                });
+            }
+        }
+    }
+}