1 // ***********************************************************************
2 // Copyright (c) 2007 Charlie Poole
4 // Permission is hereby granted, free of charge, to any person obtaining
5 // a copy of this software and associated documentation files (the
6 // "Software"), to deal in the Software without restriction, including
7 // without limitation the rights to use, copy, modify, merge, publish,
8 // distribute, sublicense, and/or sell copies of the Software, and to
9 // permit persons to whom the Software is furnished to do so, subject to
10 // the following conditions:
12 // The above copyright notice and this permission notice shall be
13 // included in all copies or substantial portions of the Software.
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 // ***********************************************************************
25 #define NUNIT_FRAMEWORK
30 using System.Collections;
32 namespace NUnit.Framework.Constraints
35 /// CollectionSupersetConstraint is used to determine whether
36 /// one collection is a superset of another
38 public class CollectionSupersetConstraint : CollectionItemsEqualConstraint
40 private IEnumerable _expected;
43 /// Construct a CollectionSupersetConstraint
45 /// <param name="expected">The collection that the actual value is expected to be a superset of</param>
46 public CollectionSupersetConstraint(IEnumerable expected)
53 /// The display name of this Constraint for use by ToString().
54 /// The default value is the name of the constraint with
55 /// trailing "Constraint" removed. Derived classes may set
56 /// this to another name in their constructors.
58 public override string DisplayName { get { return "SupersetOf"; } }
61 /// The Description of what this constraint tests, for
62 /// use in messages and in the ConstraintResult.
64 public override string Description
66 get { return "superset of " + MsgUtils.FormatValue(_expected); }
70 /// Test whether the actual collection is a superset of
71 /// the expected collection provided.
73 /// <param name="actual"></param>
74 /// <returns></returns>
75 protected override bool Matches(IEnumerable actual)
77 return Tally(actual).TryRemove(_expected);
81 /// Flag the constraint to use the supplied predicate function
83 /// <param name="comparison">The comparison function to use.</param>
84 /// <returns>Self.</returns>
85 public CollectionSupersetConstraint Using<TSupersetType, TSubsetType>(Func<TSupersetType, TSubsetType, bool> comparison)
87 // internal code reverses the expected order of the arguments.
88 Func<TSubsetType, TSupersetType, bool> invertedComparison = (actual, expected) => comparison.Invoke(expected, actual);
89 base.Using(EqualityAdapter.For(invertedComparison));