Apply trace level filter in ConsoleTraceWriter

Author: fabiocav

src/WebJobs.Script/Diagnostics/ConsoleTraceWriter.cs

@@ -15,6 +15,11 @@ public ConsoleTraceWriter(TraceLevel traceLevel) : base(traceLevel)
 
         public override void Trace(TraceEvent traceEvent)
         {
+            if (Level < traceEvent.Level)
+            {
+                return;
+            }
+
             Console.WriteLine(traceEvent.Message);
         }
     }

test/WebJobs.Script.Tests/ConsoleTraceWriterTests.cs

@@ -0,0 +1,52 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Microsoft.Azure.WebJobs.Script.Tests
+{
+    public class ConsoleTraceWriterTests
+    {
+        [Fact]
+        public void Trace_AppliesLevelFilter()
+        {
+            try
+            {
+                var traceWriter = new ConsoleTraceWriter(TraceLevel.Info);
+                using (var writer = new StringWriter())
+                {
+                    Console.SetOut(writer);
+
+                    traceWriter.Verbose("Test Verbose");
+                    traceWriter.Info("Test Info");
+                    traceWriter.Warning("Test Warning");
+                    traceWriter.Error("Test Error");
+
+                    traceWriter.Flush();
+
+                    string output = writer.ToString();
+                    string[] lines = output.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
+
+                    Assert.Equal(3, lines.Length);
+                    Assert.Equal("Test Info", lines[0]);
+                    Assert.Equal("Test Warning", lines[1]);
+                    Assert.Equal("Test Error", lines[2]);
+                    Assert.False(output.Contains("Trace Verbose"));
+                }
+            }
+            finally
+            {
+                var standardOutput = new StreamWriter(Console.OpenStandardOutput());
+                standardOutput.AutoFlush = true;
+                Console.SetOut(standardOutput);
+            }
+        }
+    }
+}

test/WebJobs.Script.Tests/WebJobs.Script.Tests.csproj

@@ -331,6 +331,7 @@
     <Compile Include="Binding\ScriptBindingContextTests.cs" />
     <Compile Include="BlobLeaseManagerTests.cs" />
     <Compile Include="CompositeTraceWriterTests.cs" />
+    <Compile Include="ConsoleTraceWriterTests.cs" />
     <Compile Include="CSharpEndToEndTests.cs" />
     <Compile Include="CSharpFunctionSignatureTests.cs" />
     <Compile Include="Description\DotNet\CSharp\CSharpCompilationTests.cs" />