Add --force-short-summary option and extend sequence printing with -vv

changelog/11777.bugfix.rst

@@ -0,0 +1 @@
+Fixed issue where sequences were still being shortened even with ``-vv`` verbosity.

changelog/12713.feature.rst

@@ -0,0 +1,3 @@
+New `--force-short-summary` option to force condensed summary output regardless of verbosity level.
+
+This lets users still see condensed summary output of failures for quick reference in log files from job outputs, being especially useful if non-condensed output is very verbose.

src/_pytest/assertion/rewrite.py

@@ -28,6 +28,7 @@
 
 from _pytest._io.saferepr import DEFAULT_REPR_MAX_SIZE
 from _pytest._io.saferepr import saferepr
+from _pytest._io.saferepr import saferepr_unlimited
 from _pytest._version import version
 from _pytest.assertion import util
 from _pytest.config import Config
@@ -433,6 +434,8 @@ def _saferepr(obj: object) -> str:
         return obj.__name__
 
     maxsize = _get_maxsize_for_saferepr(util._config)
+    if not maxsize:
+        return saferepr_unlimited(obj).replace("\n", "\\n")
     return saferepr(obj, maxsize=maxsize).replace("\n", "\\n")
 
 

src/_pytest/terminal.py

@@ -161,6 +161,13 @@ def pytest_addoption(parser: Parser) -> None:
         default=True,
         help="Do not fold skipped tests in short summary.",
     )
+    group._addoption(
+        "--force-short-summary",
+        action="store_true",
+        dest="force_short_summary",
+        default=False,
+        help="Force condensed summary output regardless of verbosity level.",
+    )
     group._addoption(
         "-q",
         "--quiet",
@@ -1500,7 +1507,9 @@ def _get_line_with_reprcrash_message(
     except AttributeError:
         pass
     else:
-        if running_on_ci() or config.option.verbose >= 2:
+        if (
+            running_on_ci() or config.option.verbose >= 2
+        ) and not config.option.force_short_summary:
             msg = f" - {msg}"
         else:
             available_width = tw.fullwidth - line_width

testing/test_terminal.py

@@ -2617,6 +2617,52 @@ def test():
     )
 
 
+def test_full_sequence_print_with_vv(
+    monkeypatch: MonkeyPatch, pytester: Pytester
+) -> None:
+    """Do not truncate sequences in summaries with -vv (#11777)."""
+    monkeypatch.setattr(_pytest.terminal, "running_on_ci", lambda: False)
+
+    pytester.makepyfile(
+        """
+        def test_len_list():
+            l = list(range(10))
+            assert len(l) == 9
+
+        def test_len_dict():
+            d = dict(zip(range(10), range(10)))
+            assert len(d) == 9
+        """
+    )
+
+    result = pytester.runpytest("-vv")
+    assert result.ret == 1
+    result.stdout.fnmatch_lines(
+        [
+            "*short test summary info*",
+            f"*{list(range(10))}*",
+            f"*{dict(zip(range(10), range(10)))}*",
+        ]
+    )
+
+
+def test_force_short_summary(monkeypatch: MonkeyPatch, pytester: Pytester) -> None:
+    monkeypatch.setattr(_pytest.terminal, "running_on_ci", lambda: False)
+
+    pytester.makepyfile(
+        """
+        def test():
+            assert "a\\n" * 10 == ""
+        """
+    )
+
+    result = pytester.runpytest("-vv", "--force-short-summary")
+    assert result.ret == 1
+    result.stdout.fnmatch_lines(
+        ["*short test summary info*", "*AssertionError: assert 'a\\na\\na\\na..."]
+    )
+
+
 @pytest.mark.parametrize(
     "seconds, expected",
     [