Initial import

1 files changed, 83 insertions, 0 deletions

diff --git a/Xamarin.Forms.Core.UnitTests/BindingExpressionTests.cs b/Xamarin.Forms.Core.UnitTests/BindingExpressionTests.cs
new file mode 100644
index 00000000..b3f0198d
--- /dev/null
+++ b/Xamarin.Forms.Core.UnitTests/BindingExpressionTests.cs
@@ -0,0 +1,83 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using NUnit.Framework;
+
+namespace Xamarin.Forms.Core.UnitTests
+{
+	[TestFixture]
+	public class BindingExpressionTests : BaseTestFixture
+	{
+		[Test]
+		public void Ctor()
+		{
+			string path = "Foo.Bar";
+			var binding = new Binding (path);
+			
+			var be = new BindingExpression (binding, path);
+
+			Assert.AreSame (binding, be.Binding);
+			Assert.AreEqual (path, be.Path);
+		}
+
+		[Test]
+		public void CtorInvalid()
+		{
+			string path = "Foo.Bar";
+			var binding = new Binding (path);
+
+			Assert.Throws<ArgumentNullException> (() => new BindingExpression (binding, null),
+				"Allowed the path to eb null");
+
+			Assert.Throws<ArgumentNullException> (() => new BindingExpression (null, path),
+				"Allowed the binding to be null");
+		}
+
+		[Test]
+		public void ApplyNull()
+		{
+			const string path = "Foo.Bar";
+			var binding = new Binding (path);
+			var be = new BindingExpression (binding, path);
+			Assert.DoesNotThrow (() => be.Apply (null, new MockBindable(), TextCell.TextProperty));
+		}
+
+		// We only throw on invalid path features, if they give an invalid property
+		// name, it won't have compiled in the first place or they misstyped.
+		[TestCase ("Foo.")]
+		[TestCase ("Foo[]")]
+		[TestCase ("Foo.Bar[]")]
+		[TestCase ("Foo[1")]
+		public void InvalidPaths (string path)
+		{
+			var fex = Assert.Throws<FormatException> (() => {
+				var binding = new Binding (path);
+				new BindingExpression (binding, path);
+			});
+
+			Assert.IsFalse (String.IsNullOrWhiteSpace (fex.Message),
+				"FormatException did not contain an explanation");
+		}
+
+		[Test]
+		public void ValidPaths (
+			[Values (
+				".", "[1]", "[1 ]", ".[1]", ". [1]",
+				"Foo", "Foo.Bar", "Foo. Bar", "Foo.Bar[1]",
+				"Foo.Bar [1]")]
+			string path,
+			[Values (true, false)] bool spaceBefore,
+			[Values (true, false)] bool spaceAfter)
+		{
+			if (spaceBefore)
+				path = " " + path;
+			if (spaceAfter)
+				path = path + " ";
+
+			var binding = new Binding (path);
+			Assert.DoesNotThrow (() => new BindingExpression (binding, path));
+		}
+	}
+}