GitHub Copilot
132 lines
4.4 KiB
Python
132 lines
4.4 KiB
Python
"""Tests for the AltScreen class with alternate screen buffer support."""
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import pyte
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import pytest
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from webterm.alt_screen import DECALTBUF, DECALTBUF_1047, DECALTBUF_1048, AltScreen
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class TestAltScreen:
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"""Tests for AltScreen alternate buffer support."""
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def test_basic_screen_operations(self):
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"""Test that basic screen operations still work."""
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screen = AltScreen(40, 10)
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stream = pyte.Stream(screen)
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stream.feed("Hello World\r\n")
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stream.feed("Line 2")
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assert "Hello World" in screen.display[0]
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assert "Line 2" in screen.display[1]
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def test_alternate_screen_save_restore(self):
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"""Test DECSET/DECRST 1049 saves and restores main screen."""
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screen = AltScreen(40, 10)
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stream = pyte.Stream(screen)
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# Write to main screen
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stream.feed("MAIN SCREEN LINE 1\r\n")
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stream.feed("MAIN SCREEN LINE 2\r\n")
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assert "MAIN SCREEN LINE 1" in screen.display[0]
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assert "MAIN SCREEN LINE 2" in screen.display[1]
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# Enter alternate screen (DECSET 1049)
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stream.feed("\x1b[?1049h")
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# Screen should be cleared
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assert screen.display[0].strip() == ""
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assert screen.display[1].strip() == ""
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# Write to alternate screen
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stream.feed("ALT SCREEN CONTENT\r\n")
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assert "ALT SCREEN CONTENT" in screen.display[0]
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# Exit alternate screen (DECRST 1049)
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stream.feed("\x1b[?1049l")
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# Main screen should be restored
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assert "MAIN SCREEN LINE 1" in screen.display[0]
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assert "MAIN SCREEN LINE 2" in screen.display[1]
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def test_alternate_screen_mode_flag(self):
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"""Test that DECALTBUF mode flag is set correctly."""
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screen = AltScreen(40, 10)
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stream = pyte.Stream(screen)
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assert DECALTBUF not in screen.mode
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stream.feed("\x1b[?1049h")
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assert DECALTBUF in screen.mode
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stream.feed("\x1b[?1049l")
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assert DECALTBUF not in screen.mode
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@pytest.mark.parametrize(
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("enter_seq", "exit_seq", "mode_flag"),
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[
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("\x1b[?1047h", "\x1b[?1047l", DECALTBUF_1047),
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("\x1b[?1048h", "\x1b[?1048l", DECALTBUF_1048),
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],
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)
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def test_alternate_screen_mode_variants(self, enter_seq, exit_seq, mode_flag):
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"""Test that DECSET/DECRST 1047/1048 trigger alternate buffer handling."""
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screen = AltScreen(40, 10)
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stream = pyte.Stream(screen)
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stream.feed("MAIN SCREEN\r\n")
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assert "MAIN SCREEN" in screen.display[0]
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stream.feed(enter_seq)
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assert mode_flag in screen.mode
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assert screen.display[0].strip() == ""
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stream.feed("ALT BUFFER\r\n")
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assert "ALT BUFFER" in screen.display[0]
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stream.feed(exit_seq)
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assert mode_flag not in screen.mode
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assert "MAIN SCREEN" in screen.display[0]
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def test_multiple_alt_screen_switches(self):
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"""Test multiple switches between main and alternate screen."""
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screen = AltScreen(40, 10)
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stream = pyte.Stream(screen)
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# Main content
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stream.feed("MAIN 1\r\n")
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stream.feed("\x1b[?1049h") # Enter alt
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stream.feed("ALT 1\r\n")
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stream.feed("\x1b[?1049l") # Exit alt
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assert "MAIN 1" in screen.display[0]
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# More main content
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stream.feed("MAIN 2\r\n")
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stream.feed("\x1b[?1049h") # Enter alt again
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assert screen.display[0].strip() == "" # Alt screen is clear
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stream.feed("\x1b[?1049l") # Exit alt
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assert "MAIN 1" in screen.display[0]
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assert "MAIN 2" in screen.display[1]
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def test_resize_invalidates_saved_buffer(self):
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"""Test that resizing clears the saved alternate screen buffer."""
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screen = AltScreen(40, 10)
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stream = pyte.Stream(screen)
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stream.feed("MAIN CONTENT\r\n")
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stream.feed("\x1b[?1049h") # Enter alt
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assert screen._saved_buffer is not None
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# Resize while in alt mode
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screen.resize(20, 80)
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assert screen._saved_buffer is None
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def test_ed_clear_still_works(self):
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"""Test that explicit ED (erase display) still works."""
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screen = AltScreen(40, 10)
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stream = pyte.Stream(screen)
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stream.feed("Line 1\r\n")
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stream.feed("Line 2\r\n")
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stream.feed("\x1b[2J") # ED 2 - erase entire display
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assert all(line.strip() == "" for line in screen.display)
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