diff --git a/scripts/e2e-testing.sh b/scripts/e2e-testing.sh
index 18a0efa..fc2a839 100644
--- a/scripts/e2e-testing.sh
+++ b/scripts/e2e-testing.sh
@@ -11,6 +11,8 @@ echo
 echo "Running end-to-end testing..."
 echo "Testing GET route '/api/v1'..."
 curl $API_URL/api/v1; echo
+echo
+echo ----------------------------------------------------------------
 
 # Testing '/api/v1/labels'.
 echo
@@ -37,13 +39,20 @@ curl -X DELETE $API_URL/api/v1/labels/3; echo
 echo
 echo "Testing GET route after DELETE '/api/v1/labels/:labelID'..."
 curl $API_URL/api/v1/labels/3; echo
+echo
+echo ----------------------------------------------------------------
 
 # Test '/api/v1/bills'
 echo
-echo "Using 'year' with value of 2023, 'month' with value of 5, and 'day' with value of 30 "
 echo "Testing GET route '/api/v1/bills'..."
 curl $API_URL/api/v1/bills; echo
 echo
+echo "Testing POST route '/api/v1/bills'..."
+curl -X POST -H 'Content-Type: application/json' -d '{"id": 10, "year": 2023,"month":6, "day": 10, "money": 200, "label": "shopping"}' $API_URL/api/v1/bills; echo
+
+# Test '/api/v1/bills/:year?/:month?/:day?'
+echo
+echo "Using 'year' with value of 2023, 'month' with value of 5, and 'day' with value of 30 "
 echo "Testing GET route '/api/v1/bills/:year'..."
 curl $API_URL/api/v1/bills/2023; echo
 echo
@@ -52,11 +61,29 @@ curl $API_URL/api/v1/bills/2023/5; echo
 echo
 echo "Testing GET route '/api/v1/bills/:year/:month/:day'..."
 curl $API_URL/api/v1/bills/2023/5/30; echo
+
+# Test '/api/v1/bills/id/:billID'
 echo
-echo "Testing POST route '/api/v1/bills"
-curl -X POST -H 'Content-Type: application/json' -d '{"year": 2023,"month":6, "day": 10, "money": 200, "label": "shopping"}' $API_URL/api/v1/bills; echo
-
+echo "Using 'billID' with value of 10 (the one created beforehand)."
+echo "Testing GET route '/api/v1/bills/id/:billID'..."
+curl $API_URL/api/v1/bills/id/10; echo
 
+# Test '/api/v1/bills/:billID'
+echo
+echo "Using 'billID' with value of 10 (the one created beforehand)."
+echo "Testing PUT route '/api/v1/bills/:billID'..."
+curl -X PUT -H 'Content-Type: application/json' -d '{"year": 2023,"month":6, "day": 10, "money": 21.2, "label": "transport"}' $API_URL/api/v1/bills/10; echo
+echo
+echo "Testing GET route after PUT '/api/v1/bills/:billID'..."
+curl $API_URL/api/v1/bills/id/10; echo
+echo
+echo "Test DELETE route '/api/v1/bills/:billID'..."
+curl -X DELETE $API_URL/api/v1/bills/10; echo
+echo
+echo "Testing GET route after DELETE '/api/v1/bills/id/:billID'..."
+curl $API_URL/api/v1/bills/id/10; echo
+echo
+echo ----------------------------------------------------------------
 
 ## Testing '/api/v1/auth/login'.
 #echo