1  using GUNRPG.Core.VirtualPet;
  2  using Xunit;
  3  
  4  namespace GUNRPG.Tests;
  5  
  6  public class PetStateTests
  7  {
  8      [Fact]
  9      public void PetState_CanBeCreated_WithAllProperties()
 10      {
 11          // Arrange
 12          var operatorId = Guid.NewGuid();
 13          var lastUpdated = DateTimeOffset.UtcNow;
 14  
 15          // Act
 16          var petState = new PetState(
 17              OperatorId: operatorId,
 18              Health: 75.0f,
 19              Fatigue: 30.0f,
 20              Injury: 10.0f,
 21              Stress: 40.0f,
 22              Morale: 80.0f,
 23              Hunger: 25.0f,
 24              Hydration: 60.0f,
 25              LastUpdated: lastUpdated
 26          );
 27  
 28          // Assert
 29          Assert.Equal(operatorId, petState.OperatorId);
 30          Assert.Equal(75.0f, petState.Health);
 31          Assert.Equal(30.0f, petState.Fatigue);
 32          Assert.Equal(10.0f, petState.Injury);
 33          Assert.Equal(40.0f, petState.Stress);
 34          Assert.Equal(80.0f, petState.Morale);
 35          Assert.Equal(25.0f, petState.Hunger);
 36          Assert.Equal(60.0f, petState.Hydration);
 37          Assert.Equal(lastUpdated, petState.LastUpdated);
 38      }
 39  
 40      [Fact]
 41      public void PetState_SupportsValueEquality()
 42      {
 43          // Arrange
 44          var operatorId = Guid.NewGuid();
 45          var lastUpdated = DateTimeOffset.UtcNow;
 46  
 47          var petState1 = new PetState(
 48              operatorId,
 49              Health: 100.0f,
 50              Fatigue: 0.0f,
 51              Injury: 0.0f,
 52              Stress: 0.0f,
 53              Morale: 100.0f,
 54              Hunger: 0.0f,
 55              Hydration: 100.0f,
 56              lastUpdated
 57          );
 58  
 59          var petState2 = new PetState(
 60              operatorId,
 61              Health: 100.0f,
 62              Fatigue: 0.0f,
 63              Injury: 0.0f,
 64              Stress: 0.0f,
 65              Morale: 100.0f,
 66              Hunger: 0.0f,
 67              Hydration: 100.0f,
 68              lastUpdated
 69          );
 70  
 71          // Assert
 72          Assert.Equal(petState1, petState2);
 73          Assert.True(petState1 == petState2);
 74      }
 75  
 76      [Fact]
 77      public void PetState_SupportsWithExpression_ForImmutableUpdates()
 78      {
 79          // Arrange
 80          var originalState = new PetState(
 81              OperatorId: Guid.NewGuid(),
 82              Health: 100.0f,
 83              Fatigue: 0.0f,
 84              Injury: 0.0f,
 85              Stress: 0.0f,
 86              Morale: 100.0f,
 87              Hunger: 0.0f,
 88              Hydration: 100.0f,
 89              LastUpdated: DateTimeOffset.UtcNow
 90          );
 91  
 92          // Act - Update health using 'with' expression
 93          var updatedState = originalState with { Health = 50.0f };
 94  
 95          // Assert
 96          Assert.Equal(100.0f, originalState.Health); // Original unchanged
 97          Assert.Equal(50.0f, updatedState.Health); // New instance with updated value
 98          Assert.Equal(originalState.OperatorId, updatedState.OperatorId); // Other values copied
 99      }
100  
101      [Fact]
102      public void PetState_AcceptsMinimumValues()
103      {
104          // Arrange & Act
105          var petState = new PetState(
106              OperatorId: Guid.Empty,
107              Health: 0.0f,
108              Fatigue: 0.0f,
109              Injury: 0.0f,
110              Stress: 0.0f,
111              Morale: 0.0f,
112              Hunger: 0.0f,
113              Hydration: 0.0f,
114              LastUpdated: DateTimeOffset.MinValue
115          );
116  
117          // Assert
118          Assert.Equal(0.0f, petState.Health);
119          Assert.Equal(0.0f, petState.Fatigue);
120          Assert.Equal(0.0f, petState.Injury);
121          Assert.Equal(0.0f, petState.Stress);
122          Assert.Equal(0.0f, petState.Morale);
123          Assert.Equal(0.0f, petState.Hunger);
124          Assert.Equal(0.0f, petState.Hydration);
125      }
126  
127      [Fact]
128      public void PetState_AcceptsMaximumValues()
129      {
130          // Arrange & Act
131          var petState = new PetState(
132              OperatorId: Guid.NewGuid(),
133              Health: 100.0f,
134              Fatigue: 100.0f,
135              Injury: 100.0f,
136              Stress: 100.0f,
137              Morale: 100.0f,
138              Hunger: 100.0f,
139              Hydration: 100.0f,
140              LastUpdated: DateTimeOffset.MaxValue
141          );
142  
143          // Assert
144          Assert.Equal(100.0f, petState.Health);
145          Assert.Equal(100.0f, petState.Fatigue);
146          Assert.Equal(100.0f, petState.Injury);
147          Assert.Equal(100.0f, petState.Stress);
148          Assert.Equal(100.0f, petState.Morale);
149          Assert.Equal(100.0f, petState.Hunger);
150          Assert.Equal(100.0f, petState.Hydration);
151      }
152  
153      [Fact]
154      public void PetState_HasSameHashCode_ForEqualValues()
155      {
156          // Arrange
157          var operatorId = Guid.NewGuid();
158          var lastUpdated = DateTimeOffset.UtcNow;
159  
160          var petState1 = new PetState(
161              operatorId,
162              Health: 100.0f,
163              Fatigue: 0.0f,
164              Injury: 0.0f,
165              Stress: 0.0f,
166              Morale: 100.0f,
167              Hunger: 0.0f,
168              Hydration: 100.0f,
169              lastUpdated
170          );
171  
172          var petState2 = new PetState(
173              operatorId,
174              Health: 100.0f,
175              Fatigue: 0.0f,
176              Injury: 0.0f,
177              Stress: 0.0f,
178              Morale: 100.0f,
179              Hunger: 0.0f,
180              Hydration: 100.0f,
181              lastUpdated
182          );
183  
184          // Assert - Equal objects must have equal hash codes
185          Assert.Equal(petState1.GetHashCode(), petState2.GetHashCode());
186      }
187  
188      [Fact]
189      public void PetState_IsImmutable_CannotModifyPropertiesDirectly()
190      {
191          // Arrange
192          var petState = new PetState(
193              OperatorId: Guid.NewGuid(),
194              Health: 100.0f,
195              Fatigue: 0.0f,
196              Injury: 0.0f,
197              Stress: 0.0f,
198              Morale: 100.0f,
199              Hunger: 0.0f,
200              Hydration: 100.0f,
201              LastUpdated: DateTimeOffset.UtcNow
202          );
203  
204          // Act - Verify that properties are init-only
205          // This test verifies immutability at compile-time
206          // The following would not compile:
207          // petState.Health = 50.0f;
208  
209          // Assert - Verify we can only create new instances with 'with' expression
210          var newState = petState with { Health = 50.0f };
211          Assert.Equal(100.0f, petState.Health);
212          Assert.Equal(50.0f, newState.Health);
213      }
214  }