imp(terminal): replace non-color escape sequences in output

src/_pytest/terminal.py

@@ -8,6 +8,7 @@
 import linecache
 import os
 import platform
+import re
 import sys
 import time
 import warnings
@@ -50,6 +51,7 @@
     from _pytest._code.code import _TracebackStyle
 
 REPORT_COLLECTING_RESOLUTION = 0.5
+RE_ESCAPE_NONCOLOR = re.compile(r'\x1b(?!\[[\d;]+m)')
 
 KNOWN_TYPES = (
     "failed",
@@ -65,6 +67,10 @@
 _REPORTCHARS_DEFAULT = "fE"
 
 
+def replace_non_color_escapes(s: str) -> str:
+    return RE_ESCAPE_NONCOLOR.sub('^[', s)
+
+
 def _getdimensions() -> Tuple[int, int]:
     # Improved version of shutil.get_terminal_size that looks at stdin,
     # stderr, stdout.  Ref: https://bugs.python.org/issue14841.
@@ -1176,6 +1182,7 @@ def _outrep_summary(self, rep):
             self.section(secname, "-")
             if content[-1:] == "\n":
                 content = content[:-1]
+            content = replace_non_color_escapes(content)
             self._tw.line(content)
 
     def summary_stats(self) -> None:

testing/test_terminal.py

@@ -25,6 +25,7 @@
 from _pytest.terminal import _get_pos
 from _pytest.terminal import _plugin_nameversions
 from _pytest.terminal import getreportopt
+from _pytest.terminal import replace_non_color_escapes
 from _pytest.terminal import TerminalReporter
 
 try:
@@ -361,6 +362,23 @@ def test_rewrite(self, testdir, monkeypatch):
         assert f.getvalue() == "hello" + "\r" + "hey" + (6 * " ")
 
 
+class TestTerminalUnit:
+    def test_replace_non_color_escapes(self) -> None:
+        f = replace_non_color_escapes
+
+        # without any escapes.
+        assert f("foo") == "foo"
+
+        # color escapes.
+        assert f('\x1b[32mINFO') == '\x1b[32mINFO'
+        assert f('\x1b[38;2;0;0;0m') == '\x1b[38;2;0;0;0m'
+
+        # non-color escapes.
+        # clears screen.
+        assert f('\033[2J\033[1;1H') == '^[[2J^[[1;1H'
+        assert f('\033') == '^['
+
+
 class TestCollectonly:
     def test_collectonly_basic(self, testdir):
         testdir.makepyfile(