This tests the selection methods on the new text field.
Test 1: setSelectionRange(0, 0)
Passed.
Test 2: selectionEnd = 17
Passed.
Test 3: selectionStart = 1
Passed.
Test 4: setSelectionRange(10, 3)
Passed.
Test 5: selectionEnd = 2
Passed.
Test 6: setSelectionRange(5, 4)
Passed.
Test 7: setSelectionRange(-5, -4)
Passed.
Test 8: setSelectionRange(-5, 80)
Passed.
Test 9: setSelectionRange(3, 12)
Passed.