[framework] Add superset constraint

3 files changed, 81 insertions, 0 deletions

diff --git a/src/framework/Constraints/CollectionSupersetConstraint.cs b/src/framework/Constraints/CollectionSupersetConstraint.cs
new file mode 100755
index 0000000..7c3a7b8
--- /dev/null
+++ b/src/framework/Constraints/CollectionSupersetConstraint.cs
@@ -0,0 +1,67 @@
+// ***********************************************************************
+// Copyright (c) 2007 Charlie Poole
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+// ***********************************************************************
+
+using System.Collections;
+
+namespace NUnit.Framework.Constraints
+{
+    /// <summary>
+    /// CollectionSupersetConstraint is used to determine whether
+    /// one collection is a superset of another
+    /// </summary>
+    public class CollectionSupersetConstraint : CollectionItemsEqualConstraint
+    {
+        private IEnumerable expected;
+
+        /// <summary>
+        /// Construct a CollectionSupersetConstraint
+        /// </summary>
+        /// <param name="expected">The collection that the actual value is expected to be a superset of</param>
+        public CollectionSupersetConstraint(IEnumerable expected) : base(expected)
+        {
+            this.expected = expected;
+            this.DisplayName = "supersetof";
+        }
+
+        /// <summary>
+        /// Test whether the actual collection is a superset of
+        /// the expected collection provided.
+        /// </summary>
+        /// <param name="actual"></param>
+        /// <returns></returns>
+        protected override bool doMatch(IEnumerable actual)
+        {
+            return Tally(actual).TryRemove( expected );
+        }
+
+        /// <summary>
+        /// Write a description of this constraint to a MessageWriter
+        /// </summary>
+        /// <param name="writer"></param>
+        public override void WriteDescriptionTo(MessageWriter writer)
+        {
+            writer.WritePredicate( "superset of" );
+            writer.WriteExpectedValue(expected);
+        }
+    }
+}
diff --git a/src/framework/GuiUnit_NET_4_5.csproj b/src/framework/GuiUnit_NET_4_5.csproj
index 35e9b95..e5c8e47 100644
--- a/src/framework/GuiUnit_NET_4_5.csproj
+++ b/src/framework/GuiUnit_NET_4_5.csproj
@@ -346,6 +346,7 @@
     <Compile Include="GuiUnit\XmlTestListener.cs" />

     <Compile Include="GuiUnit\AdditionalAsserts.cs" />

     <Compile Include="GuiUnit\GtkMainLoopIntegration.cs" />

+    <Compile Include="Constraints\CollectionSupersetConstraint.cs" />

   </ItemGroup>

   <ItemGroup>

     <Folder Include="Properties\" />

diff --git a/src/framework/Is.cs b/src/framework/Is.cs
index fe32db8..824789a 100755
--- a/src/framework/Is.cs
+++ b/src/framework/Is.cs
@@ -402,6 +402,19 @@ namespace NUnit.Framework
 
         #endregion
 
+        #region SupersetOf
+
+        /// <summary>
+        /// Returns a constraint that tests whether the actual value
+        /// is a superset of the collection supplied as an argument.
+        /// </summary>
+        public static CollectionSupersetConstraint SupersetOf (IEnumerable expected)
+        {
+            return new CollectionSupersetConstraint (expected);
+        }
+
+        #endregion
+
         #region Ordered
 
         /// <summary>