From 801f883232d0c282db742ec3305a3d9814254274 Mon Sep 17 00:00:00 2001
From: kungurtsev <kungurtsev@skbkontur.ru>
Date: Fri, 1 Oct 2021 14:07:25 +0500
Subject: [PATCH] + test

---
 .../VostokHostingEnvironmentFactory_Tests.cs        | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/Vostok.Hosting.Tests/VostokHostingEnvironmentFactory_Tests.cs b/Vostok.Hosting.Tests/VostokHostingEnvironmentFactory_Tests.cs
index eed25977..8ec834fa 100644
--- a/Vostok.Hosting.Tests/VostokHostingEnvironmentFactory_Tests.cs
+++ b/Vostok.Hosting.Tests/VostokHostingEnvironmentFactory_Tests.cs
@@ -150,6 +150,17 @@ public void Should_provide_system_metrics_extensions()
             environment.HostExtensions.TryGet<CurrentProcessMonitor>(out _).Should().BeTrue();
         }
 
+        [Test]
+        public void Should_provide_dev_null_metric_context_when_diagnostic_metrics_disabled_and_no_senders()
+        {
+            var environment = VostokHostingEnvironmentFactory.Create(Setup, new VostokHostingEnvironmentFactorySettings
+            {
+                DiagnosticMetricsEnabled = false
+            });
+
+            environment.Metrics.Root.Should().BeOfType<DevNullMetricContext>();
+        }
+
         [Test]
         public void Should_provide_dev_null_metric_context_when_no_metric_event_senders_built()
         {
@@ -163,7 +174,7 @@ void SetupForDevNullMetricContext(IVostokHostingEnvironmentBuilder builder)
                 builder.SetupDiagnostics(x => x.CustomizeInfo(s => s.AddApplicationMetricsInfo = false)); // disable ApplicationMetricsProvider metrics sender
             }
         }
-        
+
         [Test]
         public void Should_provide_not_dev_null_metric_context_when_metric_event_senders_built()
         {