From 75ae3e06b196e337f8f61d0ddd573268359d048a Mon Sep 17 00:00:00 2001
From: Denys Zhuravel <denys.zhuravel@albelli.com>
Date: Thu, 2 Aug 2018 19:06:29 +0200
Subject: [PATCH] throw on empty environmentVariableName

---
 GitHubJwt/EnvironmentVariablePrivateKeySource.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/GitHubJwt/EnvironmentVariablePrivateKeySource.cs b/GitHubJwt/EnvironmentVariablePrivateKeySource.cs
index 1f5c40d..e0bce13 100644
--- a/GitHubJwt/EnvironmentVariablePrivateKeySource.cs
+++ b/GitHubJwt/EnvironmentVariablePrivateKeySource.cs
@@ -9,6 +9,11 @@ public class EnvironmentVariablePrivateKeySource : IPrivateKeySource
 
         public EnvironmentVariablePrivateKeySource(string environmentVariableName)
         {
+            if (string.IsNullOrEmpty(environmentVariableName))
+            {
+                throw new ArgumentNullException(nameof(environmentVariableName));
+            }
+
             this.environmentVariableName = environmentVariableName;
         }