Project Migration Report

src/Microsoft.DotNet.ProjectJsonMigration/MigrationError.cs

@@ -20,7 +20,7 @@ namespace Microsoft.DotNet.ProjectJsonMigration
 
         public void Throw()
         {
-            throw new MigrationException(GetFormattedErrorMessage());
+            throw new MigrationException(this, GetFormattedErrorMessage());
         }
 
         public string GetFormattedErrorMessage()

src/Microsoft.DotNet.ProjectJsonMigration/MigrationException.cs

@@ -7,6 +7,10 @@ namespace Microsoft.DotNet.ProjectJsonMigration
 {
     public class MigrationException : Exception 
     { 
-        public MigrationException(string message) : base(message) { }
+        public MigrationError Error { get; }
+        public MigrationException(MigrationError error, string message) : base(message) 
+        { 
+            Error = error;
+        }
     }
 }

src/Microsoft.DotNet.ProjectJsonMigration/ProjectContextExtensions.cs

@@ -0,0 +1,21 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Collections.Generic;
+using Microsoft.Build.Construction;
+using System.Linq;
+using Microsoft.DotNet.ProjectModel;
+using System.IO;
+
+namespace Microsoft.DotNet.ProjectJsonMigration
+{
+    public static class ProjectContextExtensions
+    {
+        public static string GetProjectName(this ProjectContext projectContext)
+        {
+            // _ here is just an arbitrary configuration value so we can obtain the output name
+            return Path.GetFileNameWithoutExtension(projectContext.GetOutputPaths("_").CompilationFiles.Assembly);
+        }
+    }
+}

src/Microsoft.DotNet.ProjectJsonMigration/ProjectMigrator.cs

@@ -26,40 +26,47 @@ namespace Microsoft.DotNet.ProjectJsonMigration
             _ruleSet = ruleSet;
         }
 
-        public void Migrate(MigrationSettings rootSettings, bool skipProjectReferences = false)
+        public MigrationReport Migrate(MigrationSettings rootSettings, bool skipProjectReferences = false)
         {
             if (rootSettings == null)
             {
                 throw new ArgumentNullException();
             }
-            Exception exc = null;
+            
+            // Try to read the project dependencies, ignore an unresolved exception for now
+            MigrationRuleInputs rootInputs = ComputeMigrationRuleInputs(rootSettings);
             IEnumerable<ProjectDependency> projectDependencies = null;
 
             var tempMSBuildProjectTemplate = rootSettings.MSBuildProjectTemplate.DeepClone();
 
             try
             {
+                // Verify up front so we can prefer these errors over an unresolved project dependency
+                VerifyInputs(rootInputs, rootSettings);
+
                 projectDependencies = ResolveTransitiveClosureProjectDependencies(
                     rootSettings.ProjectDirectory, 
                     rootSettings.ProjectXProjFilePath);
             }
-            catch (Exception e)
+            catch (MigrationException e)
             {
-                exc = e;
+                return new MigrationReport(
+                    new List<ProjectMigrationReport>
+                    {
+                        new ProjectMigrationReport(
+                            rootSettings.ProjectDirectory,
+                            rootInputs?.DefaultProjectContext.GetProjectName(),
+                            new List<MigrationError> {e.Error},
+                            null)
+                    });
             }
 
-            // Verify up front so we can prefer these errors over an unresolved project dependency
+            var projectMigrationReports = new List<ProjectMigrationReport>();
-            VerifyInputs(ComputeMigrationRuleInputs(rootSettings), rootSettings);
+            projectMigrationReports.Add(MigrateProject(rootSettings));
-            if (exc != null)
+            
-            {
-                throw exc;
-            }
-
-            MigrateProject(rootSettings);
-
             if (skipProjectReferences)
             {
-                return;
+                return new MigrationReport(projectMigrationReports);
             }
 
             foreach(var project in projectDependencies)
@@ -70,7 +77,10 @@ namespace Microsoft.DotNet.ProjectJsonMigration
                                                      rootSettings.SdkPackageVersion,
                                                      tempMSBuildProjectTemplate);
                 MigrateProject(settings);
+                projectMigrationReports.Add(MigrateProject(settings));
             }
+
+            return new MigrationReport(projectMigrationReports);
         }
 
         private void DeleteProjectJsons(MigrationSettings rootsettings, IEnumerable<ProjectDependency> projectDependencies)
@@ -118,22 +128,37 @@ namespace Microsoft.DotNet.ProjectJsonMigration
             return projectsMap;
         }
 
-        private void MigrateProject(MigrationSettings migrationSettings)
+        private ProjectMigrationReport MigrateProject(MigrationSettings migrationSettings)
         {
             var migrationRuleInputs = ComputeMigrationRuleInputs(migrationSettings);
+            var projectName = migrationRuleInputs.DefaultProjectContext.GetProjectName();
 
-            if (IsMigrated(migrationSettings, migrationRuleInputs))
+            try
-            {
+            {                
-                // TODO : Adding user-visible logging
+                if (IsMigrated(migrationSettings, migrationRuleInputs))
-                MigrationTrace.Instance.WriteLine($"{nameof(ProjectMigrator)}: Skip migrating {migrationSettings.ProjectDirectory}, it is already migrated.");
+                {
-                return;
+                    MigrationTrace.Instance.WriteLine($"{nameof(ProjectMigrator)}: Skip migrating {migrationSettings.ProjectDirectory}, it is already migrated.");
+                    return new ProjectMigrationReport(migrationSettings.ProjectDirectory, projectName, skipped: true);
+                }
+
+                VerifyInputs(migrationRuleInputs, migrationSettings);
+
+                SetupOutputDirectory(migrationSettings.ProjectDirectory, migrationSettings.OutputDirectory);
+
+                _ruleSet.Apply(migrationSettings, migrationRuleInputs);
             }
+            catch (MigrationException exc)
+            {
+                var error = new List<MigrationError>
+                {
+                    exc.Error
+                };
 
-            VerifyInputs(migrationRuleInputs, migrationSettings);
+                return new ProjectMigrationReport(migrationSettings.ProjectDirectory, projectName, error, null);
-
+            }
-            SetupOutputDirectory(migrationSettings.ProjectDirectory, migrationSettings.OutputDirectory);
+            
-
+            var outputProject = Path.Combine(migrationSettings.OutputDirectory, projectName + ".csproj");
-            _ruleSet.Apply(migrationSettings, migrationRuleInputs);
+            return new ProjectMigrationReport(migrationSettings.ProjectDirectory, projectName, outputProject, null);
         }
 
         private MigrationRuleInputs ComputeMigrationRuleInputs(MigrationSettings migrationSettings)
@@ -230,8 +255,7 @@ namespace Microsoft.DotNet.ProjectJsonMigration
 
         public bool IsMigrated(MigrationSettings migrationSettings, MigrationRuleInputs migrationRuleInputs)
         {
-            var outputName = Path.GetFileNameWithoutExtension(
+            var outputName = migrationRuleInputs.DefaultProjectContext.GetProjectName();
-                migrationRuleInputs.DefaultProjectContext.GetOutputPaths("_").CompilationFiles.Assembly);
 
             var outputProject = Path.Combine(migrationSettings.OutputDirectory, outputName + ".csproj");
             return File.Exists(outputProject);

src/Microsoft.DotNet.ProjectJsonMigration/Report/MigrationReport.cs

@@ -0,0 +1,65 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Microsoft.DotNet.ProjectJsonMigration
+{
+    /// Any changes to this need to be reflected in roslyn-project-system
+    /// TODO add link
+    public class MigrationReport
+    {
+        public List<ProjectMigrationReport> ProjectMigrationReports { get; }
+
+        public int MigratedProjectsCount => ProjectMigrationReports.Count;
+
+        public int SucceededProjectsCount => ProjectMigrationReports.Count(p => p.Succeeded);
+
+        public int FailedProjectsCount => ProjectMigrationReports.Count(p => p.Failed);
+
+        public bool AllSucceeded => ! ProjectMigrationReports.Any(p => p.Failed);
+
+        public MigrationReport Merge(MigrationReport otherReport)
+        {
+            var allReports = ProjectMigrationReports.Concat(otherReport.ProjectMigrationReports).ToList();
+            var dedupedReports = DedupeSkippedReports(allReports);
+
+            return new MigrationReport(dedupedReports);
+        }
+
+        private List<ProjectMigrationReport> DedupeSkippedReports(List<ProjectMigrationReport> allReports)
+        {
+            var reportDict = new Dictionary<string, ProjectMigrationReport>();
+
+            foreach (var report in allReports)
+            {
+                ProjectMigrationReport existingReport;
+
+                if (reportDict.TryGetValue(report.ProjectDirectory, out existingReport))
+                {
+                    if (existingReport.Skipped)
+                    {
+                        reportDict[report.ProjectDirectory] = report;
+                    }
+                    else if (!report.Skipped)
+                    {
+                        MigrationTrace.Instance.WriteLine("Detected double project migration: {report.ProjectDirectory}");
+                    }
+                }
+                else
+                {
+                    reportDict[report.ProjectDirectory] = report;
+                }
+            }
+
+            return reportDict.Values.ToList();
+        }
+
+        public MigrationReport(List<ProjectMigrationReport> projectMigrationReports)
+        {
+            ProjectMigrationReports = projectMigrationReports;
+        }
+    }
+}

src/Microsoft.DotNet.ProjectJsonMigration/Report/ProjectMigrationReport.cs

@@ -0,0 +1,45 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Collections.Generic;
+using System.Linq;
+namespace Microsoft.DotNet.ProjectJsonMigration
+{
+    public class ProjectMigrationReport
+    {
+        public string ProjectDirectory { get; }
+
+        public string ProjectName { get; }
+
+        public string OutputMSBuildProject { get; }
+
+        public List<MigrationError> Errors { get; }
+
+        public List<string> Warnings { get; }
+
+        public bool Skipped { get; }
+
+        public bool Failed => Errors.Any();
+        
+        public bool Succeeded => !Errors.Any();
+
+        public ProjectMigrationReport(string projectDirectory, string projectName, bool skipped)
+            : this(projectDirectory, projectName, null, null, null, skipped: skipped) { }
+
+        public ProjectMigrationReport(string projectDirectory, string projectName, List<MigrationError> errors, List<string> warnings)
+            : this(projectDirectory, projectName, null, errors, warnings) { }
+
+        public ProjectMigrationReport(string projectDirectory, string projectName, string outputMSBuildProject, List<string> warnings)
+            : this(projectDirectory, projectName, outputMSBuildProject, null, warnings) { }
+
+        private ProjectMigrationReport(string projectDirectory, string projectName, string outputMSBuildProject, List<MigrationError> errors, List<string> warnings, bool skipped=false)
+        {
+            ProjectDirectory = projectDirectory;
+            ProjectName = projectName;
+            OutputMSBuildProject = outputMSBuildProject;
+            Errors = errors ?? new List<MigrationError>();
+            Warnings = warnings ?? new List<string>();
+            Skipped=skipped;
+        }
+    }
+}

src/Microsoft.DotNet.ProjectJsonMigration/Rules/MigratePackageDependenciesAndToolsRule.cs

@@ -9,7 +9,6 @@ using Microsoft.Build.Construction;
 using Microsoft.DotNet.Cli.Utils;
 using Microsoft.DotNet.ProjectJsonMigration.Transforms;
 using Microsoft.DotNet.ProjectModel;
-using Microsoft.DotNet.ProjectModel.Graph;
 using Microsoft.DotNet.Tools.Common;
 using NuGet.Frameworks;
 using NuGet.LibraryModel;
@@ -142,7 +141,6 @@ namespace Microsoft.DotNet.ProjectJsonMigration.Rules
                     transform = PackageDependencyTransform();
                     if (packageDependency.Type == LibraryDependencyType.Build)
                     {
-                        Console.WriteLine("Build type!!!");
                         transform = transform.WithMetadata("PrivateAssets", "all");
                     }
                     else if (packageDependency.SuppressParent != LibraryIncludeFlagUtils.DefaultSuppressParent)

src/Microsoft.DotNet.ProjectJsonMigration/Rules/SaveOutputProjectRule.cs

@@ -10,8 +10,7 @@ namespace Microsoft.DotNet.ProjectJsonMigration.Rules
     {
         public void Apply(MigrationSettings migrationSettings, MigrationRuleInputs migrationRuleInputs)
         {
-            var outputName = Path.GetFileNameWithoutExtension(
+            var outputName = migrationRuleInputs.DefaultProjectContext.GetProjectName();
-                migrationRuleInputs.DefaultProjectContext.GetOutputPaths("_").CompilationFiles.Assembly);
 
             var outputProject = Path.Combine(migrationSettings.OutputDirectory, outputName + ".csproj");
 

src/dotnet/commands/dotnet-migrate/MigrateCommand.cs

@@ -5,7 +5,9 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Text;
 using Microsoft.Build.Construction;
+using Microsoft.DotNet.Cli.Utils;
 using Microsoft.DotNet.ProjectJsonMigration;
 using Microsoft.DotNet.ProjectModel;
 
@@ -18,10 +20,19 @@ namespace Microsoft.DotNet.Tools.Migrate
         private readonly string _sdkVersion;
         private readonly string _xprojFilePath;
         private readonly bool _skipProjectReferences;
+        private readonly string _reportFile;
+        private readonly bool _reportFormatJson;
 
         private readonly TemporaryDotnetNewTemplateProject _temporaryDotnetNewProject;
 
-        public MigrateCommand(string templateFile, string projectArg, string sdkVersion, string xprojFilePath, bool skipProjectReferences)
+        public MigrateCommand(
+            string templateFile, 
+            string projectArg, 
+            string sdkVersion, 
+            string xprojFilePath, 
+            string reportFile, 
+            bool skipProjectReferences, 
+            bool reportFormatJson)
         {
             _templateFile = templateFile;
             _projectArg = projectArg ?? Directory.GetCurrentDirectory();
@@ -29,6 +40,8 @@ namespace Microsoft.DotNet.Tools.Migrate
             _xprojFilePath = xprojFilePath;
             _skipProjectReferences = skipProjectReferences;
             _temporaryDotnetNewProject = new TemporaryDotnetNewTemplateProject();
+            _reportFile = reportFile;
+            _reportFormatJson = reportFormatJson;
         }
 
         public int Execute()
@@ -42,16 +55,133 @@ namespace Microsoft.DotNet.Tools.Migrate
 
             EnsureNotNull(sdkVersion, "Null Sdk Version");
 
+            MigrationReport migrationReport = null;
+
             foreach (var project in projectsToMigrate)
             {
-                Console.WriteLine($"Migrating project {project}..");
                 var projectDirectory = Path.GetDirectoryName(project);
                 var outputDirectory = projectDirectory;
                 var migrationSettings = new MigrationSettings(projectDirectory, outputDirectory, sdkVersion, msBuildTemplate, _xprojFilePath);
-                new ProjectMigrator().Migrate(migrationSettings, _skipProjectReferences);
+                var projectMigrationReport = new ProjectMigrator().Migrate(migrationSettings, _skipProjectReferences);
+
+                if (migrationReport == null)
+                {
+                    migrationReport = projectMigrationReport;
+                }
+                else
+                {
+                    migrationReport = migrationReport.Merge(projectMigrationReport);
+                }
             }
 
-            return 0;
+            WriteReport(migrationReport);
+
+            return migrationReport.FailedProjectsCount;
+        }
+
+        private void WriteReport(MigrationReport migrationReport)
+        {
+
+            if (!string.IsNullOrEmpty(_reportFile))
+            {
+                using (var outputTextWriter = GetReportFileOutputTextWriter())
+                {
+                    outputTextWriter.Write(GetReportContent(migrationReport));
+                }
+            }
+
+            WriteReportToStdOut(migrationReport);
+        }
+
+        private void WriteReportToStdOut(MigrationReport migrationReport)
+        {
+            StringBuilder sb = new StringBuilder();
+
+            foreach (var projectMigrationReport in migrationReport.ProjectMigrationReports)
+            {
+                var errorContent = GetProjectReportErrorContent(projectMigrationReport, colored: true);
+                var successContent = GetProjectReportSuccessContent(projectMigrationReport, colored: true);
+                if (!string.IsNullOrEmpty(errorContent))
+                {
+                    Reporter.Error.WriteLine(errorContent);
+                }
+                else
+                {
+                    Reporter.Output.WriteLine(successContent);
+                }
+            }
+
+            Reporter.Output.WriteLine(GetReportSummary(migrationReport));
+        }
+
+        private string GetReportContent(MigrationReport migrationReport, bool colored = false)
+        {
+            if (_reportFormatJson)
+            {
+                return Newtonsoft.Json.JsonConvert.SerializeObject(migrationReport);
+            }
+
+            StringBuilder sb = new StringBuilder();
+
+            foreach (var projectMigrationReport in migrationReport.ProjectMigrationReports)
+            {
+                var errorContent = GetProjectReportErrorContent(projectMigrationReport, colored: colored);
+                var successContent = GetProjectReportSuccessContent(projectMigrationReport, colored: colored);
+                if (!string.IsNullOrEmpty(errorContent))
+                {
+                    sb.AppendLine(errorContent);
+                }
+                else
+                {
+                    sb.AppendLine(successContent);
+                }
+            }
+
+            sb.AppendLine(GetReportSummary(migrationReport));
+
+            return sb.ToString();
+        }
+
+        private string GetReportSummary(MigrationReport migrationReport)
+        {
+            StringBuilder sb = new StringBuilder();
+
+            sb.AppendLine("Summary");
+            sb.AppendLine($"Total Projects: {migrationReport.MigratedProjectsCount}");
+            sb.AppendLine($"Succeeded Projects: {migrationReport.SucceededProjectsCount}");
+            sb.AppendLine($"Failed Projects: {migrationReport.FailedProjectsCount}");
+
+            return sb.ToString();
+        }
+
+        private string GetProjectReportSuccessContent(ProjectMigrationReport projectMigrationReport, bool colored)
+        {
+            Func<string, string> GreenIfColored = (str) => colored ? str.Green() : str;
+            return GreenIfColored($"Project {projectMigrationReport.ProjectName} migration succeeded ({projectMigrationReport.ProjectDirectory})");
+        }
+
+        private string GetProjectReportErrorContent(ProjectMigrationReport projectMigrationReport, bool colored)
+        {
+            StringBuilder sb = new StringBuilder();
+            Func<string, string> RedIfColored = (str) => colored ? str.Red() : str;
+
+            if (projectMigrationReport.Errors.Any())
+            {
+
+                sb.AppendLine(RedIfColored($"Project {projectMigrationReport.ProjectName} migration failed ({projectMigrationReport.ProjectDirectory})"));
+
+                foreach (var error in projectMigrationReport.Errors.Select(e => e.GetFormattedErrorMessage()))
+                {
+                    sb.AppendLine(RedIfColored(error));
+                }
+            }
+
+            return sb.ToString();
+        }
+
+        private TextWriter GetReportFileOutputTextWriter()
+        {
+            return File.CreateText(_reportFile);
         }
 
         private IEnumerable<string> GetProjectsToMigrate(string projectArg)

src/dotnet/commands/dotnet-migrate/Program.cs

@@ -40,6 +40,9 @@ namespace Microsoft.DotNet.Tools.Migrate
             CommandOption sdkVersion = app.Option("-v|--sdk-package-version", "The version of the sdk package that will be referenced in the migrated app. The default is the version of the sdk in dotnet new -t msbuild", CommandOptionType.SingleValue);
             CommandOption xprojFile = app.Option("-x|--xproj-file", "The path to the xproj file to use. Required when there is more than one xproj in a project directory.", CommandOptionType.SingleValue);
             CommandOption skipProjectReferences = app.Option("-s|--skip-project-references", "Skip migrating project references. By default project references are migrated recursively", CommandOptionType.BoolValue);
+            
+            CommandOption reportFile = app.Option("-r|--report-file", "Output migration report to a file in addition to the console.", CommandOptionType.SingleValue);
+            CommandOption structuredReportOutput = app.Option("--format-report-file-json", "Output migration report file as json rather than user messages", CommandOptionType.BoolValue); 
 
             app.OnExecute(() =>
             {
@@ -48,7 +51,9 @@ namespace Microsoft.DotNet.Tools.Migrate
                     projectArgument.Value,
                     sdkVersion.Value(),
                     xprojFile.Value(),
-                    skipProjectReferences.BoolValue.HasValue ? skipProjectReferences.BoolValue.Value : false);
+                    reportFile.Value(),
+                    skipProjectReferences.BoolValue.HasValue ? skipProjectReferences.BoolValue.Value : false,
+                    structuredReportOutput.BoolValue.HasValue ? structuredReportOutput.BoolValue.Value : false);
 
                 return migrateCommand.Execute();
             });

src/dotnet/commands/dotnet-migrate/ProjectJsonParser.cs

@@ -1,80 +0,0 @@
-using Newtonsoft.Json.Linq;
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.DotNet.ProjectJsonMigration;
-
-namespace Microsoft.DotNet.Tools.Migrate
-{
-    /// <summary>
-    /// Parses select data from a project.json without relying on ProjectModel.
-    /// Used to parse simple information.
-    /// </summary>
-    internal class ProjectJsonParser
-    {
-        public string SdkPackageVersion { get; }
-
-        public ProjectJsonParser(JObject projectJson)
-        {
-            SdkPackageVersion = GetPackageVersion(projectJson, ConstantPackageNames.CSdkPackageName);
-        }
-
-        private string GetPackageVersion(JObject projectJson, string packageName)
-        {
-            var sdkPackageNode = SelectJsonNodes(projectJson, property => property.Name == packageName).First();
-
-            if (sdkPackageNode.Value.Type == JTokenType.String)
-            {
-                return (string)sdkPackageNode.Value;
-            }
-            else if (sdkPackageNode.Type == JTokenType.Object)
-            {
-                var sdkPackageNodeValue = (JObject)sdkPackageNode.Value;
-
-                JToken versionNode;
-                if (sdkPackageNodeValue.TryGetValue("version", out versionNode))
-                {
-                    return versionNode.Value<string>();
-                }
-                else
-                {
-                    throw new Exception("Unable to determine sdk version, no version node in default template.");
-                }
-            }
-            else
-            {
-                throw new Exception("Unable to determine sdk version, no version information found");
-            }
-        }
-
-        private IEnumerable<JProperty> SelectJsonNodes(
-            JToken jsonNode,
-            Func<JProperty, bool> condition,
-            List<JProperty> nodeAccumulator = null)
-        {
-            nodeAccumulator = nodeAccumulator ?? new List<JProperty>();
-
-            if (jsonNode.Type == JTokenType.Object)
-            {
-                var eligibleNodes = jsonNode.Children<JProperty>().Where(j => condition(j));
-                nodeAccumulator.AddRange(eligibleNodes);
-
-                foreach (var child in jsonNode.Children<JProperty>())
-                {
-                    SelectJsonNodes(child.Value, condition, nodeAccumulator: nodeAccumulator);
-                }
-            }
-            else if (jsonNode.Type == JTokenType.Array)
-            {
-                foreach (var child in jsonNode.Children())
-                {
-                    SelectJsonNodes(child, condition, nodeAccumulator: nodeAccumulator);
-                }
-            }
-
-            return nodeAccumulator;
-        }
-    }
-}

test/Microsoft.DotNet.ProjectJsonMigration.Tests/GivenAProjectMigrator.cs

@@ -37,7 +37,7 @@ namespace Microsoft.DotNet.ProjectJsonMigration.Tests
         }
 
         [Fact]
-        public void It_throws_when_migrating_a_deprecated_projectJson()
+        public void It_has_error_when_migrating_a_deprecated_projectJson()
         {
             var testProjectDirectory =
                 TestAssetsManager.CreateTestInstance("TestLibraryWithDeprecatedProjectFile", callingMethod: "z")
@@ -47,16 +47,18 @@ namespace Microsoft.DotNet.ProjectJsonMigration.Tests
             var testSettings = new MigrationSettings(testProjectDirectory, testProjectDirectory, "1.0.0", mockProj);
 
             var projectMigrator = new ProjectMigrator(new FakeEmptyMigrationRule());
-            Action migrateAction = () => projectMigrator.Migrate(testSettings);
+            var report = projectMigrator.Migrate(testSettings);
 
-            migrateAction.ShouldThrow<Exception>().Where(
+            var projectReport = report.ProjectMigrationReports.First();
-                e => e.Message.Contains("MIGRATE1011::Deprecated Project:")
+
-                     && e.Message.Contains("The 'packInclude' option is deprecated. Use 'files' in 'packOptions' instead. (line: 6, file:")
+            var errorMessage = projectReport.Errors.First().GetFormattedErrorMessage();
-                     && e.Message.Contains("The 'compilationOptions' option is deprecated. Use 'buildOptions' instead. (line: 3, file:"));
+            errorMessage.Should().Contain("MIGRATE1011::Deprecated Project:");
+            errorMessage.Should().Contain("The 'packInclude' option is deprecated. Use 'files' in 'packOptions' instead. (line: 6, file:");
+            errorMessage.Should().Contain("The 'compilationOptions' option is deprecated. Use 'buildOptions' instead. (line: 3, file:");
         }
 
         [Fact]
-        public void It_throws_when_migrating_a_non_csharp_app()
+        public void It_has_error_when_migrating_a_non_csharp_app()
         {
             var testProjectDirectory =
                 TestAssetsManager.CreateTestInstance("FSharpTestProjects/TestApp", callingMethod: "z")
@@ -66,10 +68,11 @@ namespace Microsoft.DotNet.ProjectJsonMigration.Tests
             var testSettings = new MigrationSettings(testProjectDirectory, testProjectDirectory, "1.0.0", mockProj);
 
             var projectMigrator = new ProjectMigrator(new FakeEmptyMigrationRule());
-            Action migrateAction = () => projectMigrator.Migrate(testSettings);
+            var report = projectMigrator.Migrate(testSettings);
+            var projectReport = report.ProjectMigrationReports.First();
 
-            migrateAction.ShouldThrow<Exception>().Where(
+            var errorMessage = projectReport.Errors.First().GetFormattedErrorMessage();
-                e => e.Message.Contains("MIGRATE20013::Non-Csharp App: Cannot migrate project"));
+            errorMessage.Should().Contain("MIGRATE20013::Non-Csharp App: Cannot migrate project");
         }
 
         private IEnumerable<string> EnumerateFilesWithRelativePath(string testProjectDirectory)