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
19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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
31 namespace NUnit.Framework.Constraints
34 /// StringConstraint is the abstract base for constraints
35 /// that operate on strings. It supports the IgnoreCase
36 /// modifier for string operations.
38 public abstract class StringConstraint : Constraint
41 /// The expected value
43 protected string expected;
46 /// Indicates whether tests should be case-insensitive
48 protected bool caseInsensitive;
51 /// Description of this constraint
53 protected string descriptionText;
56 /// The Description of what this constraint tests, for
57 /// use in messages and in the ConstraintResult.
59 public override string Description
63 string desc = string.Format("{0} {1}", descriptionText, MsgUtils.FormatValue(expected));
65 desc += ", ignoring case";
71 /// Constructs a StringConstraint without an expected value
73 protected StringConstraint() { }
76 /// Constructs a StringConstraint given an expected value
78 /// <param name="expected">The expected value</param>
79 protected StringConstraint(string expected)
82 this.expected = expected;
86 /// Modify the constraint to ignore case in matching.
88 public StringConstraint IgnoreCase
90 get { caseInsensitive = true; return this; }
94 /// Test whether the constraint is satisfied by a given value
96 /// <param name="actual">The value to be tested</param>
97 /// <returns>True for success, false for failure</returns>
98 public override ConstraintResult ApplyTo<TActual>(TActual actual)
100 string actualAsString = actual as string;
101 if (actual != null && actualAsString == null)
102 throw new ArgumentException("Actual value must be a string", "actual");
104 return new ConstraintResult(this, actual, Matches(actualAsString));
108 /// Test whether the constraint is satisfied by a given string
110 /// <param name="actual">The string to be tested</param>
111 /// <returns>True for success, false for failure</returns>
112 protected abstract bool Matches(string actual);