mysql query to get count

i have tables like below,

tests

id, test_name, test_code, course_id

upload_answers

id, test_id, file_name

Now i want to fetch total upload_answers count for a particular course.

Example: if course_id = 1

then i want to fetch total upload_answers which matches course_id = 1 tests

i tried like below,

SELECT t.test_id,t.test_name,t.test_code,
                (SELECT COUNT(test_id) FROM upload_answers WHERE test_id = t.test_id ) AS upload_count 
                FROM tests t WHERE t.course = $courseid

Above query displays each tests with upload_answers count.

instead i want to get total upload_answers including of all tests

Right now i am getting response like below,

 0 => {#1392 ▼
    +"test_id": 6316
    +"test_name": "Test 1"
    +"test_code": "T-6313"
    +"upload_count": 5
  }
  1 => {#1394 ▼
    +"test_id": 6317
    +"test_name": "Test 2"
    +"test_code": "T-6314"
    +"upload_count": 6
  }
  2 => {#1388 ▼
    +"test_id": 6318
    +"test_name": "Test 3 (Theme-Based)"
    +"test_code": "T-6315"
    +"upload_count": 5
  }

But output should be like below,

upload_count : 16

Thank you