GrowthRate wrappers.

PkmnLibSharpTests/Library/GrowthRateTests.cs

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+using NUnit.Framework;
+using PkmnLibSharp.Library.GrowthRates;
+
+namespace PkmnLibSharpTests.Library
+{
+    public class GrowthRateTests
+    {
+        [Test]
+        public void LookupGrowthRate()
+        {
+            var gr = new LookupGrowthRate(new uint[] {0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000});
+            Assert.AreEqual(400, gr.CalculateExperience(5));
+            Assert.AreEqual(8, gr.CalculateLevel(750));
+            gr.Dispose();
+        }
+
+        [Test]
+        public void ExternGrowthRate()
+        {
+            var gr = PkmnLibSharp.Library.GrowthRates.ExternGrowthRate.Create(experience => (byte) (experience / 100),
+                level => (uint) (level * 100));
+            Assert.AreEqual(500, gr.CalculateExperience(5));
+            Assert.AreEqual(7, gr.CalculateLevel(750));
+            gr.Dispose();
+        }
+    }
+}