Sending telemetry about actions usage. (#1688)

* Sending telemetry about actions usage.

* .

* L0 tests.

* .

src/Test/L0/Worker/HandlerL0.cs

@@ -0,0 +1,88 @@
+using System;
+using System.Runtime.CompilerServices;
+using GitHub.DistributedTask.Pipelines;
+using GitHub.DistributedTask.WebApi;
+using GitHub.Runner.Sdk;
+using GitHub.Runner.Worker;
+using GitHub.Runner.Worker.Handlers;
+using Moq;
+using Xunit;
+
+namespace GitHub.Runner.Common.Tests.Worker
+{
+    public sealed class HandlerL0
+    {
+        private Mock<IExecutionContext> _ec;
+        private ActionsStepTelemetry _stepTelemetry;
+        private TestHostContext CreateTestContext([CallerMemberName] String testName = "")
+        {
+            var hc = new TestHostContext(this, testName);
+            _stepTelemetry = new ActionsStepTelemetry();
+            _ec = new Mock<IExecutionContext>();
+            _ec.SetupAllProperties();
+            _ec.Setup(x => x.StepTelemetry).Returns(_stepTelemetry);
+
+            var trace = hc.GetTrace();
+            _ec.Setup(x => x.Write(It.IsAny<string>(), It.IsAny<string>())).Callback((string tag, string message) => { trace.Info($"[{tag}]{message}"); });
+
+            hc.EnqueueInstance<IActionCommandManager>(new Mock<IActionCommandManager>().Object);
+            return hc;
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void PrepareExecution_PopulateTelemetry_RepoActions()
+        {
+            using (TestHostContext hc = CreateTestContext())
+            {
+                // Arrange.
+                var nodeHandler = new NodeScriptActionHandler();
+                nodeHandler.Initialize(hc);
+
+                nodeHandler.ExecutionContext = _ec.Object;
+                nodeHandler.Action = new RepositoryPathReference()
+                {
+                    Name = "actions/checkout",
+                    Ref = "v2"
+                };
+
+                // Act.
+                nodeHandler.PrepareExecution(ActionRunStage.Main);
+                hc.GetTrace().Info($"Telemetry: {StringUtil.ConvertToJson(_stepTelemetry)}");
+
+                // Assert.
+                Assert.Equal("repository", _stepTelemetry.Type);
+                Assert.Equal("actions/checkout", _stepTelemetry.Action);
+                Assert.Equal("v2", _stepTelemetry.Ref);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void PrepareExecution_PopulateTelemetry_DockerActions()
+        {
+            using (TestHostContext hc = CreateTestContext())
+            {
+                // Arrange.
+                var nodeHandler = new NodeScriptActionHandler();
+                nodeHandler.Initialize(hc);
+
+                nodeHandler.ExecutionContext = _ec.Object;
+                nodeHandler.Action = new ContainerRegistryReference()
+                {
+                    Image = "ubuntu:20.04"
+                };
+
+                // Act.
+                nodeHandler.PrepareExecution(ActionRunStage.Main);
+                hc.GetTrace().Info($"Telemetry: {StringUtil.ConvertToJson(_stepTelemetry)}");
+
+                // Assert.
+                Assert.Equal("docker", _stepTelemetry.Type);
+                Assert.Equal("ubuntu:20.04", _stepTelemetry.Action);
+            }
+        }
+    }
+}