[Instrumentation.Runtime] Add unit tests

test/OpenTelemetry.Instrumentation.Runtime.Tests/RuntimeMetricsTests.cs

@@ -14,7 +14,10 @@
 // limitations under the License.
 // </copyright>
 
+using System;
 using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
 using OpenTelemetry.Metrics;
 using Xunit;
 
@@ -34,9 +37,150 @@ public void RuntimeMetricsAreCaptured()
                  .AddInMemoryExporter(exportedItems)
                 .Build();
 
+            // The process.runtime.dotnet.exception.count metrics are only available after an exception has been thrown post OpenTelemetry.Instrumentation.Runtime initialization.
+            try
+            {
+                throw new Exception("Oops!");
+            }
+            catch (Exception)
+            {
+                // swallow the exception
+            }
+
             meterProvider.ForceFlush(MaxTimeToAllowForFlush);
             Assert.True(exportedItems.Count > 1);
             Assert.StartsWith(MetricPrefix, exportedItems[0].Name);
+
+            var assembliesCountMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.assemblies.count");
+            Assert.NotNull(assembliesCountMetric);
+
+            var exceptionsCountMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.exceptions.count");
+            Assert.True(GetValue(exceptionsCountMetric) >= 1);
+        }
+
+#if NET6_0_OR_GREATER
+        [Fact]
+        public void GcMetricsTest()
+        {
+            var exportedItems = new List<Metric>();
+            using var meterProvider = Sdk.CreateMeterProviderBuilder()
+                 .AddRuntimeInstrumentation()
+                 .AddInMemoryExporter(exportedItems)
+                .Build();
+
+            GC.Collect(1);
+
+            meterProvider.ForceFlush(MaxTimeToAllowForFlush);
+
+            var gcCountMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.gc.collections.count");
+            Assert.NotNull(gcCountMetric);
+
+#if NETCOREAPP3_1_OR_GREATER
+            var gcAllocationSizeMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.gc.allocations.size");
+            Assert.NotNull(gcAllocationSizeMetric);
+#endif
+
+            var gcCommittedMemorySizeMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.gc.committed_memory.size");
+            Assert.NotNull(gcCommittedMemorySizeMetric);
+
+            var gcHeapSizeMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.gc.heap.size");
+            Assert.NotNull(gcHeapSizeMetric);
+        }
+#endif
+
+#if NET6_0_OR_GREATER
+        [Fact]
+        public void JitRelatedMetricsTest()
+        {
+            var exportedItems = new List<Metric>();
+            using var meterProvider = Sdk.CreateMeterProviderBuilder()
+                 .AddRuntimeInstrumentation()
+                 .AddInMemoryExporter(exportedItems)
+                .Build();
+
+            meterProvider.ForceFlush(MaxTimeToAllowForFlush);
+
+            var jitCompiledSizeMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.jit.il_compiled.size");
+            Assert.NotNull(jitCompiledSizeMetric);
+
+            var jitMethodsCompiledCountMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.jit.methods_compiled.count");
+            Assert.NotNull(jitMethodsCompiledCountMetric);
+
+            var jitCompilationTimeMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.jit.compilation_time");
+            Assert.NotNull(jitCompilationTimeMetric);
+        }
+#endif
+
+#if NETCOREAPP3_1_OR_GREATER
+        [Fact]
+        public void ThreadingRelatedMetricsTest()
+        {
+            var exportedItems = new List<Metric>();
+            using var meterProvider = Sdk.CreateMeterProviderBuilder()
+                 .AddRuntimeInstrumentation()
+                 .AddInMemoryExporter(exportedItems)
+                .Build();
+
+            meterProvider.ForceFlush(MaxTimeToAllowForFlush);
+
+            var lockContentionCountMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.monitor.lock_contention.count");
+            Assert.NotNull(lockContentionCountMetric);
+
+            var threadCountMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.thread_pool.threads.count");
+            Assert.NotNull(threadCountMetric);
+
+            var completedItemsCountMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.thread_pool.completed_items.count");
+            Assert.NotNull(completedItemsCountMetric);
+
+            var queueLengthMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.thread_pool.queue.length");
+            Assert.NotNull(queueLengthMetric);
+
+            List<Timer> timers = new List<Timer>();
+            try
+            {
+                // Create 10 timers to bump timer.count metrics.
+                int timerCount = 10;
+                TimerCallback timerCallback = _ => { };
+                for (int i = 0; i < timerCount; i++)
+                {
+                    Timer timer = new Timer(timerCallback, null, 1000, 250);
+                    timers.Add(timer);
+                }
+
+                meterProvider.ForceFlush(MaxTimeToAllowForFlush);
+
+                var timerCountMetric = exportedItems.FirstOrDefault(i => i.Name == "process.runtime.dotnet.timer.count");
+                Assert.True(GetValue(timerCountMetric) >= timerCount);
+            }
+            finally
+            {
+                for (int i = 0; i < timers.Count; i++)
+                {
+                    timers[i].Dispose();
+                }
+            }
+        }
+#endif
+
+        private static double GetValue(Metric metric)
+        {
+            Assert.NotNull(metric);
+            double sum = 0;
+
+            foreach (ref readonly var metricPoint in metric.GetMetricPoints())
+            {
+                if (metric.MetricType.IsSum())
+                {
+                    sum += metricPoint.GetSumLong();
+                }
+                else
+                {
+                    sum += metricPoint.GetGaugeLastValueLong();
+                    break;
+                }
+            }
+
+            return sum;
         }
     }
 }