Add Configurator unit tests

UnitTests/ConfiguratorTests.cs

 using System;
+using Helios.Models;
+using Helios.Source;
 using NUnit.Framework;
 
 namespace UnitTests
 {
 	public class ConfiguratorTests
     {
-        [SetUp]
-        public void Setup()
+        [Test]
+        public void GetElevationAngle_SunAngle_ReturnsAngle()
+        {
+            Roof roof = new Roof();
+            roof.Elevation = 25;
+
+            int elevationAngle = roof.GetElevationAngle(60);
+
+            Assert.AreEqual(85, elevationAngle);
+        }
+
+        [Test]
+        public void GetPowerOutput_MockNumbers_ReturnsExpected()
+        {
+            SolarPanel panel = new SolarPanel();
+            panel.Efficiency = 0.2; 
+
+            int solarEnergy = 1000;
+            int roofArea = 7;
+            int roofElevation = 85;
+
+            double powerOutput = panel.GetPowerOutput(solarEnergy, roofArea, roofElevation);
+
+            Assert.AreEqual(1394.67, Math.Round(powerOutput, 2));
+        }
+
+        [Test]
+        public void GetInstallationCost_MockArea_ReturnExpected()
         {
+            SolarPanel panel = new SolarPanel();
+            panel.CostPerMetreSquared = 100;
+
+            int roofArea = 7;
+
+            double installationCost = panel.GetInstallationCost(roofArea);
+
+            Assert.AreEqual(700, installationCost);
         }
 
         [Test]
-        public void Test1()
+        public void GetCostPerWatt_MockPanel_ReturnExpected()
         {
-            Assert.Pass();
+            SolarPanel panel = new SolarPanel();
+            panel.Efficiency = 0.2;
+            panel.CostPerMetreSquared = 100;
+
+            int solarEnergy = 1000;
+            int roofArea = 7;
+            int roofElevation = 85;
+
+            panel.GetInstallationCost(7);
+            panel.GetPowerOutput(solarEnergy, roofArea, roofElevation);
+
+            double costPerWatt = panel.GetCostPerWatt();
+
+            Assert.AreEqual(0.50, Math.Round(costPerWatt, 2));
         }
+
     }
 }