fix: holiday update in tests
diff --git a/erpnext/projects/doctype/project/project.py b/erpnext/projects/doctype/project/project.py
index f6bb6e9..60f85b0 100644
--- a/erpnext/projects/doctype/project/project.py
+++ b/erpnext/projects/doctype/project/project.py
@@ -81,18 +81,12 @@
 
 	def calculate_start_date(self, task_details):
 		self.start_date = add_days(self.expected_start_date, task_details.start)
-		self.start_date = self.update_if_holiday(self.start_date)
+		self.start_date = update_if_holiday(self.holiday_list, self.start_date)
 		return self.start_date
 
 	def calculate_end_date(self, task_details):
 		self.end_date = add_days(self.start_date, task_details.duration)
-		return self.update_if_holiday(self.end_date)
-
-	def update_if_holiday(self, date):
-		holiday_list = self.holiday_list or get_holiday_list()
-		while is_holiday(holiday_list, date):
-			date = add_days(date, 1)
-		return date
+		return update_if_holiday(self.holiday_list, self.end_date)
 
 	def dependency_mapping(self, template_tasks, project_tasks):
 		for template_task in template_tasks:
@@ -547,3 +541,9 @@
 
 	project.status = status
 	project.save()
+
+def update_if_holiday(holiday_list, date):
+	holiday_list = holiday_list or get_holiday_list()
+	while is_holiday(holiday_list, date):
+		date = add_days(date, 1)
+	return date
diff --git a/erpnext/projects/doctype/project/test_project.py b/erpnext/projects/doctype/project/test_project.py
index 0faf976..af978e8 100644
--- a/erpnext/projects/doctype/project/test_project.py
+++ b/erpnext/projects/doctype/project/test_project.py
@@ -8,7 +8,7 @@
 test_ignore = ["Sales Order"]
 
 from erpnext.projects.doctype.project_template.test_project_template import make_project_template
-from erpnext.projects.doctype.project.project import set_project_status
+from erpnext.projects.doctype.project.project import set_project_status, update_if_holiday
 from erpnext.projects.doctype.task.test_task import create_task
 from frappe.utils import getdate, nowdate, add_days
 
@@ -128,4 +128,8 @@
 	return frappe.get_doc("Task", result[0].name)
 
 def calculate_end_date(project, start, duration):
-	return getdate(add_days(project.expected_start_date, start + duration))
\ No newline at end of file
+	start = add_days(project.expected_start_date, start)
+	start = update_if_holiday(project.holiday_list, start)
+	end = add_days(start, duration)
+	end = update_if_holiday(project.holiday_list, end)
+	return getdate(end)
\ No newline at end of file