ORACLE FUNCTION testcase - oracle

Question

I want to create a function which returns BOOLEAN.
The function would check if a value exists (classic verification if a department already exists).
I implemented the NO_DATA_FOUND exception and I want, also, to add the WHEN OTHERS; but I don't have in mind any test case.
Here is the code of the function:
FUNCTION fnc_department_exists(p_dept_name hr.departments.department_name%TYPE) RETURN BOOLEAN IS
v_dummy PLS_INTEGER;
BEGIN
-- Verifica existenta unui anumit departament
pkg_logging.prc_log('HR', 'VERIFIC', 'Verifica daca exista departamentul "' || p_dept_name || '"');
SELECT 1
INTO v_dummy
FROM hr.departments
WHERE UPPER(department_name) = UPPER(p_dept_name);
pkg_logging.prc_log('HR', 'VERIFIC', 'Departamentul "' || p_dept_name || '" exista');
RETURN TRUE;
EXCEPTION
WHEN NO_DATA_FOUND THEN
pkg_logging.prc_log('HR', 'VERIFIC', 'Departamentul "' || p_dept_name || '" nu exista');
RETURN FALSE;
WHEN OTHERS THEN
pkg_logging.prc_log('HR', 'VERIFIC', 'A aparut o alta eroare: ' || SQLCODE || ' - ' || SQLERRM);
RETURN FALSE;
END fnc_department_exists;
Can someone suggest a test case for WHEN OTHERS branch, please?
Thank you,

Answer 1

If you have a department named e.g. 'PAYROLL', add another one named 'Payroll' and another one named 'payroll'. This will cause the SELECT to fail with an ORA-01422 (TOO_MANY_ROWS) exception.
I suggest that when your code gets into the WHEN OTHERS block, you should re-raise the exception rather than eating it and returning false. Thus:
WHEN OTHERS THEN
pkg_logging.prc_log('HR', 'VERIFIC', 'A aparut o alta eroare: ' ||
SQLCODE || ' - ' || SQLERRM);
RAISE;
Best of luck.