diff --git a/tslint.json b/tslint.json
index 2df923a4d21..8d7d53b4910 100644
--- a/tslint.json
+++ b/tslint.json
@@ -44,11 +44,15 @@
 			}
 		],
 		"import-patterns": [
-			false,
+			true,
 			{
 				"target": "**/{node,electron-browser,electron-main}/**",
 				"restrictions": "**/*"
 			},
+			{
+				"target": "**/**.test.ts",
+				"restrictions": "{**/vs/**,assert,sinon}"
+			},
 			{
 				"target": "**/{common,browser,workbench}/**",
 				"restrictions": "{**/vs/**,assert}"