diff --git a/app.sh b/app.sh
index 2773689..f59c3dd 100755
--- a/app.sh
+++ b/app.sh
@@ -1,7 +1,9 @@
 #!/bin/sh
 
-# Check if TEST_MODE is set to "true"
+# If TEST_MODE is true, install Mocha and run tests
 if [ "$TEST_MODE" = "true" ]; then
+  echo "Installing Mocha for testing..."
+  npm install mocha
   echo "Running tests..."
   npm test
 else