Throw custom exception when time provider is not set.

Author: hbjorgo

src/HeboTech.TimeService/HeboTech.TimeService.csproj

@@ -10,7 +10,7 @@
     <PackageReleaseNotes>https://github.com/hbjorgo/TimeService/releases</PackageReleaseNotes>
     <PackageTags>time timeservice time-service timefunc time-func</PackageTags>
     <RepositoryUrl>https://github.com/hbjorgo/TimeService</RepositoryUrl>
-    <Version>1.1.0</Version>
+    <Version>1.2.0</Version>
   </PropertyGroup>
 
 </Project>

src/HeboTech.TimeService/TimeProviderNotSetException.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace HeboTech.TimeService
+{
+    public class TimeProviderNotSetException : Exception
+    {
+        public TimeProviderNotSetException()
+        {
+        }
+
+        public TimeProviderNotSetException(string message) : base(message)
+        {
+        }
+    }
+}

src/HeboTech.TimeService/TimeService.cs

@@ -9,7 +9,7 @@ public static class TimeService
         /// <summary>
         /// Gets a DateTime object that represents the current time
         /// </summary>
-        public static DateTime Now => timeFunc();
+        public static DateTime Now => timeFunc?.Invoke() ?? throw new TimeProviderNotSetException("Time provider is not set");
 
         /// <summary>
         /// Sets the current time. The func can either return a constant time, or a dynamic one (like DateTime.Now).

src/Tests/HeboTech.TimeService.Tests/TimeServiceTests.cs

@@ -10,7 +10,7 @@ public class TimeServiceTests
         [Fact]
         public void A_SystemTime_now_throws_exception_when_provider_is_not_set_test()
         {
-            Assert.Throws<NullReferenceException>(() => TimeService.Now);
+            Assert.Throws<TimeProviderNotSetException>(() => TimeService.Now);
         }
 
         [Fact]