Fix: burner damage was lower than expected

Burner unit tests

source/TextBlade.Core.Tests/Battle/Statuses/BurnerTests.cs

@@ -0,0 +1,25 @@
+using System.Text.RegularExpressions;
+using NUnit.Framework;
+using TextBlade.Core.Battle.Statuses;
+using TextBlade.Core.Characters;
+
+namespace TextBlade.Core.Tests.Battle.Statuses;
+
+[TestFixture]
+public class BurnerTests
+{
+    [Test]
+    public void Burn_CausesDamageUpToCurrentHealth()
+    {
+        // Arrange
+        var e = new Monster("TestMon", 1000, 1, 1);
+
+        // Act
+        var message = Burner.Burn(e);
+
+        // Assert
+        var actual = int.Parse(Regex.Match(message, @"\](\d+)\[").Groups[1].Value);
+        Assert.That(actual, Is.LessThan(e.TotalHealth));
+        Assert.That(e.CurrentHealth, Is.EqualTo(e.TotalHealth - actual));
+    }
+}

source/TextBlade.Core/Battle/Statuses/Burner.cs

@@ -16,7 +16,7 @@ public static class Burner
     public static string Burn(Entity e)
     {
         var fireSpreadPercent = MaximumBurnDamagePercent - MinimumBurnDamagePercent;
-        var firePercentDamage = Random.Shared.NextSingle() * fireSpreadPercent;
+        var firePercentDamage = MinimumBurnDamagePercent + (Random.Shared.NextSingle() * fireSpreadPercent);
 
         var fireDamage = (int)Math.Max(MinimumFireDamage, firePercentDamage * e.CurrentHealth);