Tools -> Create/Update Tests

Generated code:

    /**
     * Test of createConnection method, of class DBConnection.
     */
    @Test
    public void testCreateConnection_0args() throws Exception {
        System.out.println("createConnection");
        Connection expResult = null;
        Connection result = DBConnection.createConnection();
        assertEquals(expResult, result);
        // TODO review the generated test code and remove the default call to fail.
        fail("The test case is a prototype.");
    }

Editor shows warning: Missing @throws tag for java.lang.Exception