diff --git a/packages/testing/src/TestContext.ts b/packages/testing/src/TestContext.ts
new file mode 100644
index 00000000000..20c13648bec
--- /dev/null
+++ b/packages/testing/src/TestContext.ts
@@ -0,0 +1,11 @@
+import {InjectorService} from "@tsed/di";
+
+export class TestContext {
+  static injector: InjectorService | null;
+  static reset() {
+    if (this.injector) {
+      this.injector.clear();
+    }
+    this.injector = null;
+  }
+}
diff --git a/packages/testing/src/bootstrap.ts b/packages/testing/src/bootstrap.ts
index 25f39f16753..11b0dfc72c6 100644
--- a/packages/testing/src/bootstrap.ts
+++ b/packages/testing/src/bootstrap.ts
@@ -1,4 +1,5 @@
 import {$log} from "ts-log-debug";
+import {TestContext} from "./testContext";
 
 /**
  * Load the server silently without listening port and configure it on test profile.
@@ -16,8 +17,8 @@ export function bootstrap(server: any, ...args: any[]) {
 
     instance.startServers = () => Promise.resolve();
 
-    // TODO used by inject method
-    this.$$injector = instance.injector;
+    // used by inject method
+    TestContext.injector = instance.injector;
 
     instance
       .start()
diff --git a/packages/testing/src/inject.ts b/packages/testing/src/inject.ts
index 528f4072843..001f4558bff 100644
--- a/packages/testing/src/inject.ts
+++ b/packages/testing/src/inject.ts
@@ -1,5 +1,6 @@
 import {Done} from "./done";
 import {loadInjector} from "./loadInjector";
+import {TestContext} from "./testContext";
 
 /**
  * The inject function is one of the TsExpressDecorator testing utilities.
@@ -16,7 +17,7 @@ import {loadInjector} from "./loadInjector";
  */
 export function inject(targets: any[], func: Function) {
   return function before(done: Function) {
-    const injector = this.$$injector || loadInjector();
+    const injector = TestContext.injector || loadInjector();
 
     let isDoneInjected = false;
     const args = targets.map(target => {