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# coding: utf-8
from __future__ import unicode_literals
from py._io.terminalwriter import TerminalWriter
def test_terminal_writer_line_width_init():
tw = TerminalWriter()
assert tw.chars_on_current_line == 0
assert tw.width_of_current_line == 0
def test_terminal_writer_line_width_update():
tw = TerminalWriter()
tw.write('hello world')
assert tw.chars_on_current_line == 11
assert tw.width_of_current_line == 11
def test_terminal_writer_line_width_update_with_newline():
tw = TerminalWriter()
tw.write('hello\nworld')
assert tw.chars_on_current_line == 5
assert tw.width_of_current_line == 5
def test_terminal_writer_line_width_update_with_wide_text():
tw = TerminalWriter()
tw.write('乇乂ㄒ尺卂 ㄒ卄丨匚匚')
assert tw.chars_on_current_line == 11
assert tw.width_of_current_line == 21 # 5*2 + 1 + 5*2
def test_terminal_writer_line_width_update_with_wide_bytes():
tw = TerminalWriter()
tw.write('乇乂ㄒ尺卂 ㄒ卄丨匚匚'.encode('utf-8'))
assert tw.chars_on_current_line == 11
assert tw.width_of_current_line == 21
def test_terminal_writer_line_width_composed():
tw = TerminalWriter()
text = 'café food'
assert len(text) == 9
tw.write(text)
assert tw.chars_on_current_line == 9
assert tw.width_of_current_line == 9
def test_terminal_writer_line_width_combining():
tw = TerminalWriter()
text = 'café food'
assert len(text) == 10
tw.write(text)
assert tw.chars_on_current_line == 10
assert tw.width_of_current_line == 9