Make integration test work in the CI

ci/config.ini

@@ -0,0 +1,26 @@
+[Main]
+# Enable the trace agent.
+apm_enabled = true
+
+# trace-agent will use this hostname when reporting to the Datadog backend.
+# default: stdout of `hostname`
+hostname = myhost
+
+# trace-agent will use this api key when reporting to the Datadog backend.
+# no default.
+api_key = "api_key"
+
+# trace-agent will bind to this host when listening for traces
+# additionally trace-agent expects dogstatsd to be bound to the same host
+# for forwarding internal monitoring metrics
+bind_host = 127.0.0.1
+
+# trace-agent expects dogstatsd to be listening over UDP on this port
+# this is where it will forward internal monitoring metrics
+dogstatsd_port = 8125
+
+# trace-agent will log it's output with this log level
+log_level = INFO
+
+[trace.api]
+endpoint = https://trace.agent.datadoghq.com

ci/runtraceagent.ps1

@@ -0,0 +1,3 @@
+# This script downloads the 5.19.0 version of the trace-agent and runs it in the background for the integration tests
+Invoke-WebRequest https://github.com/DataDog/datadog-trace-agent/releases/download/5.19.0/trace-agent-windows-5.19.0.exe -OutFile trace-agent-windows.exe
+Start-Process trace-agent-windows.exe "--ddconfig $PSScriptRoot\config.ini"

src/Datadog.Trace.Tests.Net45/Datadog.Trace.Tests.Net45.csproj

@@ -20,15 +20,15 @@
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <DefineConstants>TRACE;DEBUG;NET45_TESTS</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
+    <DefineConstants>TRACE;NET45_TESTS</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>

src/Datadog.Trace.Tests/TracerTests.cs

@@ -19,8 +19,10 @@ public void BuildSpan_NoParameter_DefaultParameters()
             var span = (Span)builder.Start();
 #if NETCOREAPP2_0
             Assert.Equal("testhost", span.ServiceName);
-#else
+#elif NET45_TESTS
             Assert.Equal("Datadog.Trace.Tests.Net45", span.ServiceName);
+#else
+            Assert.Equal("Datadog.Trace.Tests", span.ServiceName);
 #endif
             Assert.Equal("Op1", span.OperationName);
         }