diff --git a/src/Microsoft.DotNet.ProjectJsonMigration/MigrationErrorCodes.cs b/src/Microsoft.DotNet.ProjectJsonMigration/MigrationErrorCodes.cs
index efc00d476..df8f1c186 100644
--- a/src/Microsoft.DotNet.ProjectJsonMigration/MigrationErrorCodes.cs
+++ b/src/Microsoft.DotNet.ProjectJsonMigration/MigrationErrorCodes.cs
@@ -24,6 +24,9 @@ namespace Microsoft.DotNet.ProjectJsonMigration
         public static Func<string, MigrationError> MIGRATE1016
             => (message) => new MigrationError(nameof(MIGRATE1016), "Unsupported Script Variable", message);
 
+        public static Func<string, MigrationError> MIGRATE1017
+            => (message) => new MigrationError(nameof(MIGRATE1017), "Multiple Xproj Files", message);
+
         // Potentially Temporary (Point in Time) Errors
         public static Func<string, MigrationError> MIGRATE20011
             => (message) => new MigrationError(nameof(MIGRATE20011), "Multi-TFM", message);
diff --git a/src/Microsoft.DotNet.ProjectJsonMigration/ProjectMigrator.cs b/src/Microsoft.DotNet.ProjectJsonMigration/ProjectMigrator.cs
index 05a1d06dc..5ffe24deb 100644
--- a/src/Microsoft.DotNet.ProjectJsonMigration/ProjectMigrator.cs
+++ b/src/Microsoft.DotNet.ProjectJsonMigration/ProjectMigrator.cs
@@ -72,7 +72,9 @@ namespace Microsoft.DotNet.ProjectJsonMigration
 
             if (allXprojFiles.Count() > 1)
             {
-                throw new Exception("Multiple xproj files found in {projectDirectory}, please specify which to use");
+                MigrationErrorCodes
+                    .MIGRATE1017($"Multiple xproj files found in {projectDirectory}, please specify which to use")
+                    .Throw();
             }
 
             return allXprojFiles.FirstOrDefault();
diff --git a/test/Microsoft.DotNet.ProjectJsonMigration.Tests/Rules/GivenThatIWantToMigrateProjectDependencies.cs b/test/Microsoft.DotNet.ProjectJsonMigration.Tests/Rules/GivenThatIWantToMigrateProjectDependencies.cs
index f5cb968cc..5170eda59 100644
--- a/test/Microsoft.DotNet.ProjectJsonMigration.Tests/Rules/GivenThatIWantToMigrateProjectDependencies.cs
+++ b/test/Microsoft.DotNet.ProjectJsonMigration.Tests/Rules/GivenThatIWantToMigrateProjectDependencies.cs
@@ -116,6 +116,7 @@ namespace Microsoft.DotNet.ProjectJsonMigration.Tests
             migratedProjectReferenceItems.Select(m => m.Include).Should().BeEquivalentTo(expectedMigratedReferences);
         }
 
+        [Fact]
         public void It_migrates_csproj_ProjectReference_in_xproj_including_condition_on_ProjectReference()
         {
             var projectReference = "some/to.csproj";
@@ -149,6 +150,7 @@ namespace Microsoft.DotNet.ProjectJsonMigration.Tests
             migratedProjectReferenceItem.Condition.Should().Be(" '$(Foo)' == 'bar' ");
         }
 
+        [Fact]
         public void It_migrates_csproj_ProjectReference_in_xproj_including_condition_on_ProjectReference_parent()
         {
             var projectReference = "some/to.csproj";
@@ -182,6 +184,7 @@ namespace Microsoft.DotNet.ProjectJsonMigration.Tests
             migratedProjectReferenceItem.Condition.Should().Be(" '$(Foo)' == 'bar' ");
         }
 
+        [Fact]
         public void It_migrates_csproj_ProjectReference_in_xproj_including_condition_on_ProjectReference_parent_and_item()
         {
             var projectReference = "some/to.csproj";
diff --git a/test/Microsoft.DotNet.ProjectJsonMigration.Tests/Rules/GivenThatIWantToMigrateTFMs.cs b/test/Microsoft.DotNet.ProjectJsonMigration.Tests/Rules/GivenThatIWantToMigrateTFMs.cs
index 45e58436f..d95877ff9 100644
--- a/test/Microsoft.DotNet.ProjectJsonMigration.Tests/Rules/GivenThatIWantToMigrateTFMs.cs
+++ b/test/Microsoft.DotNet.ProjectJsonMigration.Tests/Rules/GivenThatIWantToMigrateTFMs.cs
@@ -43,6 +43,7 @@ namespace Microsoft.DotNet.ProjectJsonMigration.Tests
             mockProj.Properties.Count(p => p.Name == "TargetFrameworkVersion").Should().Be(0);
         }
 
+        [Fact]
         public void Migrating_MultiTFM_project_Populates_TargetFrameworks_with_short_tfms()
         {
             var testDirectory = Temp.CreateDirectory().Path;
@@ -67,6 +68,7 @@ namespace Microsoft.DotNet.ProjectJsonMigration.Tests
                 .Value.Should().Be("net20;net35;net40;net461;netstandard1.5");
         }
 
+        [Fact]
         public void Migrating_Single_TFM_project_Populates_TargetFrameworks_with_short_tfm()
         {
             var testDirectory = Temp.CreateDirectory().Path;