public void GetFilesInGroup_InRoot()
        {
            // Arrange
            var templatesDir = "C:/wwwroot/templates";
            var options = new GeneratorOptions();
            var filesProvider = new Mock<IFilesProvider>();
            filesProvider
                .Setup(p => p.EnumerateFilesInDirectory(templatesDir))
                .Returns(new[] { new FakeFileContext("foo.tmpl.html", "foo") });
            var coreGenerator = new CoreGenerator(options, filesProvider.Object);

            // Act
            var files = coreGenerator.GetFilesInGroup(templatesDir, "~");

            // Arrange
            Assert.True(files[0].Name == "foo.tmpl.html");
        }