diff --git a/packages/mobx-react-lite/__tests__/tsconfig.json b/packages/mobx-react-lite/__tests__/tsconfig.json
new file mode 100644
index 0000000000..206aeaf88e
--- /dev/null
+++ b/packages/mobx-react-lite/__tests__/tsconfig.json
@@ -0,0 +1,3 @@
+{
+    "extends": "../tsconfig.test.json"
+}
diff --git a/packages/mobx-react/__tests__/tsconfig.json b/packages/mobx-react/__tests__/tsconfig.json
new file mode 100644
index 0000000000..206aeaf88e
--- /dev/null
+++ b/packages/mobx-react/__tests__/tsconfig.json
@@ -0,0 +1,3 @@
+{
+    "extends": "../tsconfig.test.json"
+}
diff --git a/packages/mobx-undecorate/__tests__/tsconfig.json b/packages/mobx-undecorate/__tests__/tsconfig.json
new file mode 100644
index 0000000000..ecae17017d
--- /dev/null
+++ b/packages/mobx-undecorate/__tests__/tsconfig.json
@@ -0,0 +1,3 @@
+{
+    "extends": "../../../tsconfig.test.json"
+}
diff --git a/packages/mobx/__tests__/tsconfig.json b/packages/mobx/__tests__/tsconfig.json
new file mode 100644
index 0000000000..ecae17017d
--- /dev/null
+++ b/packages/mobx/__tests__/tsconfig.json
@@ -0,0 +1,3 @@
+{
+    "extends": "../../../tsconfig.test.json"
+}