feat: stalled on day 12 part 2

12/GardenGroups.Tests/RegionTests.cs

@@ -2,5 +2,33 @@
 
 public class RegionTests
 {
+  [Test]
+  public async Task Region_WhenInstanceConstructed_ItShouldSetPlantTypeProperty()
+  {
+    var plantType = 'A';
+
+    var region = Region.From('A');
+
+    await Assert.That(region.PlantType).IsEqualTo(plantType);
+  }
+
+  [Test]
+  public async Task IncreasePerimeter_WhenCalled_ItShouldIncreaseRegionPerimeter()
+  {
+    var region = Region.From('A');
+    
+    region.IncreasePerimeter();
+
+    await Assert.That(region.Perimeter).IsEqualTo(1);
+  }
   
+  [Test]
+  public async Task CalculatePrice_WhenCalled_ItShouldReturnExpectedValue()
+  {
+    var region = Region.From('A');
+
+    var result = region.CalculateFencePriceBasedOnPerimeter();
+
+    await Assert.That(result).IsEqualTo(0);
+  }
 }