Remove redundant Thread.Sleep(minute) (#179)

src/OpenTelemetry.Exporter.ApplicationInsights/Implementation/MetricsExporterThread.cs

@@ -66,8 +66,6 @@ namespace OpenTelemetry.Exporter.ApplicationInsights.Implementation
                         Thread.Sleep(this.cancellationInterval);
                         sleepInterval = sleepInterval.Subtract(this.cancellationInterval);
                     }
-
-                    Thread.Sleep(sleepInterval);
                 }
             }
             catch (Exception ex)

test/OpenTelemetry.Exporter.ApplicationInsights.Tests/Implementation/ApplicationInsightsExporterTests.cs

@@ -0,0 +1,43 @@
+// <copyright file="ApplicationInsightsExporterTests.cs" company="OpenTelemetry Authors">
+// Copyright 2018, OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of theLicense at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+
+using System.Diagnostics;
+using System.Threading.Tasks;
+using Microsoft.ApplicationInsights.Extensibility;
+using OpenTelemetry.Trace.Export;
+using Xunit;
+
+namespace OpenTelemetry.Exporter.ApplicationInsights.Tests.Implementation
+{
+    public class ApplicationInsightsExporterTests
+    {
+        [Fact]
+        public async Task StartStopExporter()
+        {
+            var config = new TelemetryConfiguration { TelemetryChannel = new StubTelemetryChannel(), };
+            var exporter = new ApplicationInsightsExporter(SpanExporter.Create(), Stats.Stats.ViewManager,  config);
+
+            exporter.Start();
+            await Task.Delay(100);
+
+            var sw = Stopwatch.StartNew();
+            exporter.Stop();
+            sw.Stop();
+
+            Assert.InRange(sw.ElapsedMilliseconds, 0, 1000);
+        }
+    }
+}