Some UT

PixiEditorTests/HelpersTests/SupportedFilesHelperTests.cs

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+using PixiEditor.Helpers;
+using Xunit;
+
+namespace PixiEditorTests.HelpersTests
+{
+    public class SupportedFilesHelperTests
+    {
+        [Fact]
+        public void TestAllExtensionsAreSupported()
+        {
+            var all = SupportedFilesHelper.GetAllSupportedExtensions();
+            Assert.Contains(all, i => i == ".pixi");
+            Assert.Contains(all, i => i == ".png");
+            Assert.Contains(all, i => i == ".jpg");
+            Assert.Contains(all, i => i == ".jpeg");
+            Assert.Contains(all, i => i == ".bmp");
+            Assert.Contains(all, i => i == ".gif");
+        }
+
+        [Fact]
+        public void TestBuildSaveFilter()
+        {
+            var filter = SupportedFilesHelper.BuildSaveFilter(true);
+            Assert.Equal("PixiEditor Files|*.pixi|Png Images|*.png|Jpeg Images|*.jpeg|Bmp Images|*.bmp|Gif Images|*.gif", filter);
+        }
+
+        [Fact]
+        public void TestBuildOpenFilter()
+        {
+            var filter = SupportedFilesHelper.BuildOpenFilter();
+            Assert.Equal("Any |*.pixi;*.png;*.jpeg;*.jpg;*.bmp;*.gif|PixiEditor Files |*.pixi|Image Files |*.png;*.jpeg;*.jpg;*.bmp;*.gif", filter);
+        }
+
+        [Fact]
+        public void TestIsSupportedFile()
+        {
+            Assert.True(SupportedFilesHelper.IsSupportedFile("foo.png"));
+            Assert.True(SupportedFilesHelper.IsSupportedFile("foo.bmp"));
+            Assert.True(SupportedFilesHelper.IsSupportedFile("foo.jpg"));
+            Assert.True(SupportedFilesHelper.IsSupportedFile("foo.jpeg"));
+
+            Assert.False(SupportedFilesHelper.IsSupportedFile("foo.abc"));
+        }
+    }
+}