public void GetTheme(Brush foreground, Brush background, Theme?expectedTheme)
{
var textPropertiesFactory = new TextFormattingRunPropertiesFactory();
var textProperties = textPropertiesFactory.Create(foreground, background);
var classificationFormatMap = Substitute.For <IClassificationFormatMap>();
classificationFormatMap.DefaultTextProperties.Returns(textProperties);
var classificationFormatMapService = Substitute.For <IClassificationFormatMapService>();
classificationFormatMapService.GetClassificationFormatMap(Arg.Any <string>())
.Returns(classificationFormatMap);
var environmentService = new EnvironmentService(classificationFormatMapService);
var actualTheme = environmentService.GetTheme();
actualTheme.Should().Be(expectedTheme);
}
