added Add_CoordinateValidator_Test method

Author: Petr Sramek

tests/PolylineAlgorithm.DependencyInjection.Tests/ServiceCollectionExtensionsTests.cs

@@ -9,6 +9,20 @@ namespace PolylineAlgorithm.DependencyInjection.Tests {
     public class ServiceCollectionExtensionsTests {
         private static IServiceCollection Services { get; } = new ServiceCollection().AddPolylineAlgorithm();
 
+        [TestMethod]
+        public void Add_CoordinateValidator_Test() {
+            // Arrange
+            var provider = Services
+                .BuildServiceProvider();
+
+            // Act
+            var encoder = provider
+                .GetRequiredService<ICoordinateValidator>();
+
+            // Assert
+            Assert.IsInstanceOfType<ICoordinateValidator>(encoder);
+        }
+
         [TestMethod]
         public void Add_PolylineEncoder_Test() {
             // Arrange