diff --git a/Editor/AssetBundleBrowserMain.cs b/Editor/AssetBundleBrowserMain.cs
index 1d68073..6b1be5b 100644
--- a/Editor/AssetBundleBrowserMain.cs
+++ b/Editor/AssetBundleBrowserMain.cs
@@ -2,6 +2,8 @@
 using UnityEditor;
 using UnityEngine;
 
+[assembly: System.Runtime.CompilerServices.InternalsVisibleToAttribute("com.unity.assetbundlebrowser.EditorTests")]
+
 namespace AssetBundleBrowser
 {
 
diff --git a/Tests/Editor/com.unity.assetbundlebrowser.EditorTests.asmdef b/Tests/Editor/com.unity.assetbundlebrowser.EditorTests.asmdef
new file mode 100644
index 0000000..aafe241
--- /dev/null
+++ b/Tests/Editor/com.unity.assetbundlebrowser.EditorTests.asmdef
@@ -0,0 +1,13 @@
+{
+    "name": "com.unity.assetbundlebrowser.EditorTests",
+    "references": [
+        "com.unity.assetbundlebrowser.Editor"
+    ],
+	"optionalUnityReferences": [
+        "TestAssemblies"
+    ],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": []
+}
diff --git a/Tests/Editor/com.unity.assetbundlebrowser.EditorTests.asmdef.meta b/Tests/Editor/com.unity.assetbundlebrowser.EditorTests.asmdef.meta
new file mode 100644
index 0000000..96dc8c7
--- /dev/null
+++ b/Tests/Editor/com.unity.assetbundlebrowser.EditorTests.asmdef.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 3d1fdbe22eba988408e4d2776f3d21ee
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: