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OpacityTests.cs
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/
OpacityTests.cs
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using System.Collections;
using System.Linq;
using System.Threading.Tasks;
using NUnit.Framework;
namespace Xamarin.Forms.Platform.iOS.UnitTests
{
[TestFixture]
public class OpacityTests : PlatformTestFixture
{
static readonly double TestOpacity = 0.4;
static IEnumerable TestCases
{
get
{
foreach (var element in BasicViews)
{
element.Opacity = TestOpacity;
yield return CreateTestCase(element);
}
}
}
[Test, Category("Opacity"), TestCaseSource(nameof(TestCases))]
[Description("VisualElement opacity should match renderer opacity")]
public async Task OpacityConsistent(View view)
{
var expected = view.Opacity;
var actual = await GetRendererProperty(view, r => r.NativeView.Alpha, requiresLayout: true);
// Deliberately casting this to double because Within doesn't seem to grasp nfloat
// If you write this the other way around (casting expected to an nfloat), it fails
Assert.That((double)actual, Is.EqualTo(expected).Within(0.001d));
}
}
}