diff --git a/src/OmniSharp.Roslyn/MetadataHelper.cs b/src/OmniSharp.Roslyn/MetadataHelper.cs
index 833a5cb127..02a5979be0 100644
--- a/src/OmniSharp.Roslyn/MetadataHelper.cs
+++ b/src/OmniSharp.Roslyn/MetadataHelper.cs
@@ -59,8 +59,16 @@ public string GetFilePathForSymbol(Project project, ISymbol symbol)
         {
             var filePath = GetFilePathForSymbol(project, symbol);
             var topLevelSymbol = GetTopLevelContainingNamedType(symbol);
-            var temporaryDocument = project.AddDocument(filePath, string.Empty);
 
+            // since submission projects cannot have new documents added to it
+            // we will use temporary project to hold metadata documents
+            var metadataProject = project.IsSubmission 
+                ? project.Solution.AddProject("metadataTemp", "metadataTemp.dll", LanguageNames.CSharp)
+                    .WithCompilationOptions(project.CompilationOptions)
+                    .WithMetadataReferences(project.MetadataReferences)
+                : project;
+
+            var temporaryDocument = metadataProject.AddDocument(filePath, string.Empty);
             var service = _csharpMetadataAsSourceService.CreateInstance(temporaryDocument.Project.LanguageServices);
             var method = _csharpMetadataAsSourceService.GetMethod(AddSourceToAsync);
 
diff --git a/tests/OmniSharp.Roslyn.CSharp.Tests/GoToDefinitionFacts.cs b/tests/OmniSharp.Roslyn.CSharp.Tests/GoToDefinitionFacts.cs
index ae59d5c842..a369fef21e 100644
--- a/tests/OmniSharp.Roslyn.CSharp.Tests/GoToDefinitionFacts.cs
+++ b/tests/OmniSharp.Roslyn.CSharp.Tests/GoToDefinitionFacts.cs
@@ -58,10 +58,12 @@ class Bar {
             await TestGoToSourceAsync(testFile1, testFile2);
         }
 
-        [Fact]
-        public async Task ReturnsDefinitionInMetadata_WhenSymbolIsStaticMethod()
+        [Theory]
+        [InlineData("bar.cs")]
+        [InlineData("bar.csx")]
+        public async Task ReturnsDefinitionInMetadata_WhenSymbolIsStaticMethod(string filename)
         {
-            var testFile = new TestFile("bar.cs", @"
+            var testFile = new TestFile(filename, @"
 using System;
 class Bar {
     public void Baz() {
@@ -74,10 +76,12 @@ await TestGoToMetadataAsync(testFile,
                 expectedTypeName: "System.Guid");
         }
 
-        [Fact]
-        public async Task ReturnsDefinitionInMetadata_WhenSymbolIsInstanceMethod()
+        [Theory]
+        [InlineData("bar.cs")]
+        [InlineData("bar.csx")]
+        public async Task ReturnsDefinitionInMetadata_WhenSymbolIsInstanceMethod(string filename)
         {
-            var testFile = new TestFile("bar.cs", @"
+            var testFile = new TestFile(filename, @"
 using System.Collections.Generic;
 class Bar {
     public void Baz() {
@@ -91,10 +95,12 @@ await TestGoToMetadataAsync(testFile,
                 expectedTypeName: "System.Collections.Generic.List`1");
         }
 
-        [Fact]
-        public async Task ReturnsDefinitionInMetadata_WhenSymbolIsGenericType()
+        [Theory]
+        [InlineData("bar.cs")]
+        [InlineData("bar.csx")]
+        public async Task ReturnsDefinitionInMetadata_WhenSymbolIsGenericType(string filename)
         {
-            var testFile = new TestFile("bar.cs", @"
+            var testFile = new TestFile(filename, @"
 using System.Collections.Generic;
 class Bar {
     public void Baz() {
@@ -108,10 +114,12 @@ await TestGoToMetadataAsync(testFile,
                 expectedTypeName: "System.Collections.Generic.List`1");
         }
 
-        [Fact]
-        public async Task ReturnsDefinitionInMetadata_WhenSymbolIsType()
+        [Theory]
+        [InlineData("bar.cs")]
+        [InlineData("bar.csx")]
+        public async Task ReturnsDefinitionInMetadata_WhenSymbolIsType(string filename)
         {
-            var testFile = new TestFile("bar.cs", @"
+            var testFile = new TestFile(filename, @"
 using System;
 class Bar {
     public void Baz() {
diff --git a/tests/TestUtility/OmniSharpTestHost.cs b/tests/TestUtility/OmniSharpTestHost.cs
index 770cf962bd..c71e0b9da4 100644
--- a/tests/TestUtility/OmniSharpTestHost.cs
+++ b/tests/TestUtility/OmniSharpTestHost.cs
@@ -136,7 +136,12 @@ public void AddFilesToWorkspace(params TestFile[] testFiles)
                 this.Workspace,
                 "project.json",
                 new[] { "dnx451", "dnxcore50" },
-                testFiles);
+                testFiles.Where(f => f.FileName.EndsWith(".cs", StringComparison.OrdinalIgnoreCase)).ToArray());
+
+            foreach (var csxFile in testFiles.Where(f => f.FileName.EndsWith(".csx", StringComparison.OrdinalIgnoreCase)))
+            {
+                TestHelpers.AddCsxProjectToWorkspace(Workspace, csxFile);
+            }
         }
     }
 }
diff --git a/tests/TestUtility/TestHelpers.cs b/tests/TestUtility/TestHelpers.cs
index 011b33448e..ad699a74dc 100644
--- a/tests/TestUtility/TestHelpers.cs
+++ b/tests/TestUtility/TestHelpers.cs
@@ -12,13 +12,16 @@ public static class TestHelpers
     {
         public static OmniSharpWorkspace CreateCsxWorkspace(TestFile testFile)
         {
-            var versionStamp = VersionStamp.Create();
+            var workspace = new OmniSharpWorkspace(new HostServicesAggregator(Enumerable.Empty<IHostServicesProvider>()));
+            AddCsxProjectToWorkspace(workspace, testFile);
+            return workspace;
+        }
+
+        public static void AddCsxProjectToWorkspace(OmniSharpWorkspace workspace, TestFile testFile)
+        {
             var mscorlib = MetadataReference.CreateFromFile(AssemblyHelpers.FromType(typeof(object)).Location);
             var systemCore = MetadataReference.CreateFromFile(AssemblyHelpers.FromType(typeof(Enumerable)).Location);
             var references = new[] { mscorlib, systemCore };
-            var workspace = new OmniSharpWorkspace(
-                new HostServicesAggregator(
-                    Enumerable.Empty<IHostServicesProvider>()));
 
             var parseOptions = new CSharpParseOptions(
                 LanguageVersion.Default,
@@ -46,7 +49,6 @@ public static OmniSharpWorkspace CreateCsxWorkspace(TestFile testFile)
                 filePath: testFile.FileName);
 
             workspace.AddDocument(documentInfo);
-            return workspace;
         }
 
         public static void AddProjectToWorkspace(OmniSharpWorkspace workspace, string filePath, string[] frameworks, TestFile[] testFiles)
diff --git a/tests/TestUtility/TestUtility.csproj b/tests/TestUtility/TestUtility.csproj
index 05956f2a48..b1c9dcf144 100644
--- a/tests/TestUtility/TestUtility.csproj
+++ b/tests/TestUtility/TestUtility.csproj
@@ -19,6 +19,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="2.0.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="2.0.0" />
     <PackageReference Include="Microsoft.DotNet.ProjectModel" Version="1.0.0-rc3-1-003177" />
     <PackageReference Include="Microsoft.DotNet.ProjectModel.Workspaces" Version="1.0.0-preview2-1-003177" />
     <PackageReference Include="xunit" Version="2.2.0" />