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annotate SilverlightValidation/SilverlightValidation.Tests/TestSupport/CommandCanExecuteAssertHelper.cs @ 97:1adc1ae981ea

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Tests added to SilverlightValidation.Tests
author stevenhollidge <stevenhollidge@hotmail.com>
date Sat, 05 May 2012 16:39:00 +0100
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97
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1 using System;
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2 using System.Windows.Input;
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3 using NUnit.Framework;
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4
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5 namespace SilverlightValidation.Tests.TestSupport
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6 {
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7 public static class CommandCanExecuteAssertHelper
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8 {
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9 #region Assert methods (using helper)
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10
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11 #region Can/cannot execute
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12
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13 /// <summary>
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14 /// Raises an assertion if the supplied command's CanExecute method returns false.
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15 /// </summary>
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16 /// <remarks>
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17 /// CanExecute is passed null.
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18 /// </remarks>
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19 /// <param name="command">The command.</param>
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20 public static void AssertCanExecute(this ICommand command)
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21 {
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22 if (command == null) throw new ArgumentNullException("command");
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23
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24 Assert.IsTrue(command.CanExecute(null));
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25 }
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26
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27 /// <summary>
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28 /// Raises an assertion if the supplied command's CanExecute method returns false.
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29 /// </summary>
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30 /// <typeparam name="T"></typeparam>
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31 /// <param name="command">The command.</param>
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32 /// <param name="value">A value to pass to CanExecute.</param>
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33 public static void AssertCanExecute<T>(this ICommand command, T value)
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34 {
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35 if (command == null) throw new ArgumentNullException("command");
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36
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37 Assert.IsTrue(command.CanExecute(value));
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38 }
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39
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40 /// <summary>
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41 /// Raises an assertion if the supplied command's CanExecute method returns true.
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42 /// </summary>
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43 /// <remarks>
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44 /// CanExecute is passed null.
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45 /// </remarks>
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46 /// <param name="command">The command.</param>
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47 public static void AssertCannotExecute(this ICommand command)
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48 {
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49 if (command == null) throw new ArgumentNullException("command");
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50
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51 Assert.IsTrue(!command.CanExecute(null));
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52 }
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53
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54 /// <summary>
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55 /// Raises an assertion if the supplied command's CanExecute method returns true.
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56 /// </summary>
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57 /// <typeparam name="T"></typeparam>
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58 /// <param name="command">The command.</param>
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59 /// <param name="value">A value to pass to CanExecute.</param>
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60 public static void AssertCannotExecute<T>(this ICommand command, T value)
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61 {
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62 if (command == null) throw new ArgumentNullException("command");
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63
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64 Assert.IsTrue(!command.CanExecute(value));
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65 }
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66
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67 #endregion
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68
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69 #region Assert is raised/Assert is not raised (CommandCanExecute)
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70
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71 /// <summary>
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72 /// Raises an assertion if the action is invoked and the supplied command
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73 /// raises a CommandCanExecuteChanged event.
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74 /// </summary>
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75 /// <param name = "command">The command.</param>
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76 /// <param name = "action">The action to invoke.</param>
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77 public static void AssertIsNotRaised(this ICommand command, Action action)
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78 {
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79 Assert.IsTrue(IsNotRaised(command, action));
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80 }
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81
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82 /// <summary>
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83 /// Raises an assertion if the action is invoked and the supplied command
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84 /// does not raise at least one CommandCanExecuteChanged event.
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85 /// </summary>
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86 /// <param name = "command">The command.</param>
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87 /// <param name = "action">The action to invoke.</param>
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88 public static void AssertIsRaised(this ICommand command, Action action)
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89 {
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90 Assert.IsTrue(IsRaised(command, action));
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91 }
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92
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93 /// <summary>
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94 /// Raises an assertion if the action is invoked and the supplied command
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95 /// does raise the number of CommandCanExecuteChanged events as defined by the
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96 /// supplied predicate.
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97 /// </summary>
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98 /// <param name = "command">The command.</param>
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99 /// <param name = "predicate">The predicate.</param>
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100 /// <param name = "action">The action to invoke.</param>
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101 public static void AssertIsRaised(this ICommand command, Predicate<int> predicate, Action action)
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102 {
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103 Assert.IsTrue(IsRaised(command, predicate, action));
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104 }
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105
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106 #endregion
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107
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108 #endregion
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109
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110 #region Is raised/Is not raised methods (CommandCanExecute)
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111
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112 /// <summary>
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113 /// Determines if the specified CommandCanExecuteChanged event is
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114 /// not raised when the supplied action is invoked.
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115 /// </summary>
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116 /// <param name = "command">The command.</param>
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117 /// <param name = "action">The action to invoke.</param>
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118 public static bool IsNotRaised(this ICommand command, Action action)
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119 {
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120 return !IsRaised(command, action);
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121 }
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122
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123 /// <summary>
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124 /// Determines if the specified CommandCanExecuteChanged event is
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125 /// raised one or more times when the supplied action is invoked.
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126 /// </summary>
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127 /// <param name = "command">The command.</param>
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128 /// <param name = "action">The action to invoke.</param>
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129 /// <returns>
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130 /// <c>true</c> if the specified command is raised; otherwise, <c>false</c>.
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131 /// </returns>
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132 public static bool IsRaised(this ICommand command, Action action)
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133 {
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134 return IsRaised(command, count => count > 0, action);
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135 }
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136
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137 /// <summary>
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138 /// Determines if the specified CommandCanExecuteChanged event is
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139 /// raised the number of times as defined by the predicate when the supplied action is invoked.
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140 /// </summary>
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141 /// <param name = "command">The command.</param>
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142 /// <param name = "predicate">A predicate.</param>
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143 /// <param name = "action">The action to invoke.</param>
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144 /// <returns>
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145 /// <c>true</c> if the specified command's CanExecuteChanged event is raised; otherwise, <c>false</c>.
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146 /// </returns>
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147 public static bool IsRaised(this ICommand command, Predicate<int> predicate, Action action)
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148 {
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149 if (predicate == null) throw new ArgumentNullException("predicate");
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150 if (action == null) throw new ArgumentNullException("action");
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151
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152 using (var watcher = new CommandCanExecuteChangedEventWatcher(command))
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153 {
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154 action();
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155
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156 return predicate(watcher.RaisedCount);
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157 }
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158 }
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159
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160 #endregion
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161 }
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162 }