Here's some sample code you could use as a starting point for your Apex trigger:

	trigger UpdateAccountNumber on Account (before insert, before update) {
		// Iterate through each Account record in Trigger.new
		for (Account updatedAccount : Trigger.new) {
			// Generate a random 4-digit number
			Integer randomNum = Math.mod(Math.abs(Crypto.getRandomInteger()), 10000);
			String randomStr = String.format('0000', new List<Object>{randomNum}).substring(0, 4);

			// Set the Account Number field to "test" + the random number
			updatedAccount.AccountNumber = 'Test' + randomStr;
		}
	}

This trigger fires `before insert` and `before update` events on the Account object, modifies them before they're saved to the database, generates a random 4-digit number, sets the Account Number field to "test" plus the random number, and saves the changes back to the database. Note that the format of the random number may need to be adjusted depending on the requirements of your specific use case. Additionally, make sure to test thoroughly before deploying any triggers to production environments.
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