refactor: call repost directly during tests (#30277)

enqueue(now=frappe.flags.in_test) is always true in test, this change avoids
confusion.
diff --git a/erpnext/stock/doctype/repost_item_valuation/repost_item_valuation.py b/erpnext/stock/doctype/repost_item_valuation/repost_item_valuation.py
index f4d52ad..f8ec784 100644
--- a/erpnext/stock/doctype/repost_item_valuation/repost_item_valuation.py
+++ b/erpnext/stock/doctype/repost_item_valuation/repost_item_valuation.py
@@ -45,11 +45,21 @@
 			self.db_set('status', self.status)
 
 	def on_submit(self):
-		if not frappe.flags.in_test or self.flags.dont_run_in_test or frappe.flags.dont_execute_stock_reposts:
+		"""During tests reposts are executed immediately.
+
+		Exceptions:
+			1. "Repost Item Valuation" document has self.flags.dont_run_in_test
+			2. global flag frappe.flags.dont_execute_stock_reposts is set
+
+			These flags are useful for asserting real time behaviour like quantity updates.
+		"""
+
+		if not frappe.flags.in_test:
+			return
+		if self.flags.dont_run_in_test or frappe.flags.dont_execute_stock_reposts:
 			return
 
-		frappe.enqueue(repost, timeout=1800, queue='long',
-			job_name='repost_sle', now=frappe.flags.in_test, doc=self)
+		repost(self)
 
 	@frappe.whitelist()
 	def restart_reposting(self):