Added Unit Tests

Tests/HelpersUtilsTest.cs

@@ -0,0 +1,46 @@
+using Elwig.Helpers;
+
+namespace Tests {
+    [TestClass]
+    public class HelpersUtilsTest {
+
+        private static readonly double[,] Gradation = new double[,] {
+            { 14.0,  68.0 },
+            { 15.0,  73.0 },
+            { 17.1,  84.0 },
+            { 19.0,  94.0 },
+            { 21.0, 105.0 },
+            { 25.0, 127.0 },
+            { 27.1, 139.0 },
+            { 30.0, 156.0 },
+        };
+
+        [TestMethod]
+        public void Test_KmwToOe() {
+            for (int i = 0; i < Gradation.GetLength(0); i++) {
+                Assert.AreEqual(Gradation[i, 1], Utils.KmwToOe(Gradation[i, 0]));
+            }
+        }
+
+        [TestMethod]
+        public void Test_OeToKmw() {
+            for (int i = 0; i < Gradation.GetLength(0); i++) {
+                Assert.AreEqual(Gradation[i, 0], Utils.OeToKmw(Gradation[i, 1]));
+            }
+        }
+
+        [TestMethod]
+        public void Test_DecFromDb() {
+            Assert.AreEqual(10.67M, Utils.DecFromDb(10670, 3));
+            Assert.AreEqual(-100.9999M, Utils.DecFromDb(-1009999, 4));
+            Assert.AreEqual(0.01M, Utils.DecFromDb(1, 2));
+        }
+
+        [TestMethod]
+        public void Test_DecToDb() {
+            Assert.AreEqual(21948, Utils.DecToDb(219.48M, 2));
+            Assert.AreEqual(-12345, Utils.DecToDb(-1.2345M, 4));
+            Assert.AreEqual(99190, Utils.DecToDb(99190, 0));
+        }
+    }
+}

Tests/Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0-windows</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
+    <PackageReference Include="coverlet.collector" Version="3.1.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Elwig\Elwig.csproj" />
+  </ItemGroup>
+
+</Project>

Tests/Usings.cs

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+global using Microsoft.VisualStudio.TestTools.UnitTesting;