Add EditableAttributeTest construction test

Progresses issue #921

Author: ghuntley

src/System.ComponentModel.Annotations/src/System/ComponentModel/DataAnnotations/EditableAttribute.cs

@@ -10,7 +10,7 @@ namespace System.ComponentModel.DataAnnotations
     /// <remarks>
     ///     This attribute neither enforces nor guarantees editability; the underlying data
     ///     store might allow changing the data regardless of this attribute.  The presence
-    ///     of this attribute signals intent to the consumer of the attribute whethere or not
+    ///     of this attribute signals intent to the consumer of the attribute whether or not
     ///     the end user should be allowed to change the value via the client application.
     /// </remarks>
     [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]

src/System.ComponentModel.Annotations/tests/EditableAttributeTests.cs

@@ -0,0 +1,31 @@
+using Xunit;
+
+namespace System.ComponentModel.DataAnnotations
+{
+    public class EditableAttributeTests
+    {
+        [Theory]
+        [InlineData(true)]
+        [InlineData(false)]
+        public void Can_construct_and_both_AllowEdit_and_AllowInitialValue_are_set(bool value)
+        {
+            var attribute = new EditableAttribute(value);
+            Assert.Equal(value, attribute.AllowEdit);
+            Assert.Equal(value, attribute.AllowInitialValue);
+        }
+
+        [Theory]
+        [InlineData(true)]
+        [InlineData(false)]
+        public void Properties_are_independent(bool value)
+        {
+            var attribute = new EditableAttribute(value);
+            Assert.Equal(value, attribute.AllowEdit);
+            Assert.Equal(value, attribute.AllowInitialValue);
+
+            attribute.AllowInitialValue = !value;
+            Assert.Equal(value, attribute.AllowEdit);
+            Assert.Equal(!value, attribute.AllowInitialValue);
+        }
+    }
+}

src/System.ComponentModel.Annotations/tests/System.ComponentModel.Annotations.Tests.csproj

@@ -20,6 +20,7 @@
     <Compile Include="CreditCardAttributeTests.cs" />
     <Compile Include="CustomValidationAttributeTests.cs" />
     <Compile Include="DataTypeAttributeTests.cs" />
+    <Compile Include="EditableAttributeTests.cs" />
     <Compile Include="EmailAddressAttributeTests.cs" />
     <Compile Include="EnumDataTypeAttributeTests.cs" />
     <Compile Include="FileExtensionsAttributeTests.cs" />