tests versuch 2

venv/lib/python3.11/site-packages/_pytest/assertion/__init__.py

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+"""Support for presenting detailed information in failing assertions."""
+import sys
+from typing import Any
+from typing import Generator
+from typing import List
+from typing import Optional
+from typing import TYPE_CHECKING
+
+from _pytest.assertion import rewrite
+from _pytest.assertion import truncate
+from _pytest.assertion import util
+from _pytest.assertion.rewrite import assertstate_key
+from _pytest.config import Config
+from _pytest.config import hookimpl
+from _pytest.config.argparsing import Parser
+from _pytest.nodes import Item
+
+if TYPE_CHECKING:
+    from _pytest.main import Session
+
+
+def pytest_addoption(parser: Parser) -> None:
+    group = parser.getgroup("debugconfig")
+    group.addoption(
+        "--assert",
+        action="store",
+        dest="assertmode",
+        choices=("rewrite", "plain"),
+        default="rewrite",
+        metavar="MODE",
+        help=(
+            "Control assertion debugging tools.\n"
+            "'plain' performs no assertion debugging.\n"
+            "'rewrite' (the default) rewrites assert statements in test modules"
+            " on import to provide assert expression information."
+        ),
+    )
+    parser.addini(
+        "enable_assertion_pass_hook",
+        type="bool",
+        default=False,
+        help="Enables the pytest_assertion_pass hook. "
+        "Make sure to delete any previously generated pyc cache files.",
+    )
+
+
+def register_assert_rewrite(*names: str) -> None:
+    """Register one or more module names to be rewritten on import.
+
+    This function will make sure that this module or all modules inside
+    the package will get their assert statements rewritten.
+    Thus you should make sure to call this before the module is
+    actually imported, usually in your __init__.py if you are a plugin
+    using a package.
+
+    :param names: The module names to register.
+    """
+    for name in names:
+        if not isinstance(name, str):
+            msg = "expected module names as *args, got {0} instead"  # type: ignore[unreachable]
+            raise TypeError(msg.format(repr(names)))
+    for hook in sys.meta_path:
+        if isinstance(hook, rewrite.AssertionRewritingHook):
+            importhook = hook
+            break
+    else:
+        # TODO(typing): Add a protocol for mark_rewrite() and use it
+        # for importhook and for PytestPluginManager.rewrite_hook.
+        importhook = DummyRewriteHook()  # type: ignore
+    importhook.mark_rewrite(*names)
+
+
+class DummyRewriteHook:
+    """A no-op import hook for when rewriting is disabled."""
+
+    def mark_rewrite(self, *names: str) -> None:
+        pass
+
+
+class AssertionState:
+    """State for the assertion plugin."""
+
+    def __init__(self, config: Config, mode) -> None:
+        self.mode = mode
+        self.trace = config.trace.root.get("assertion")
+        self.hook: Optional[rewrite.AssertionRewritingHook] = None
+
+
+def install_importhook(config: Config) -> rewrite.AssertionRewritingHook:
+    """Try to install the rewrite hook, raise SystemError if it fails."""
+    config.stash[assertstate_key] = AssertionState(config, "rewrite")
+    config.stash[assertstate_key].hook = hook = rewrite.AssertionRewritingHook(config)
+    sys.meta_path.insert(0, hook)
+    config.stash[assertstate_key].trace("installed rewrite import hook")
+
+    def undo() -> None:
+        hook = config.stash[assertstate_key].hook
+        if hook is not None and hook in sys.meta_path:
+            sys.meta_path.remove(hook)
+
+    config.add_cleanup(undo)
+    return hook
+
+
+def pytest_collection(session: "Session") -> None:
+    # This hook is only called when test modules are collected
+    # so for example not in the managing process of pytest-xdist
+    # (which does not collect test modules).
+    assertstate = session.config.stash.get(assertstate_key, None)
+    if assertstate:
+        if assertstate.hook is not None:
+            assertstate.hook.set_session(session)
+
+
+@hookimpl(tryfirst=True, hookwrapper=True)
+def pytest_runtest_protocol(item: Item) -> Generator[None, None, None]:
+    """Setup the pytest_assertrepr_compare and pytest_assertion_pass hooks.
+
+    The rewrite module will use util._reprcompare if it exists to use custom
+    reporting via the pytest_assertrepr_compare hook.  This sets up this custom
+    comparison for the test.
+    """
+
+    ihook = item.ihook
+
+    def callbinrepr(op, left: object, right: object) -> Optional[str]:
+        """Call the pytest_assertrepr_compare hook and prepare the result.
+
+        This uses the first result from the hook and then ensures the
+        following:
+        * Overly verbose explanations are truncated unless configured otherwise
+          (eg. if running in verbose mode).
+        * Embedded newlines are escaped to help util.format_explanation()
+          later.
+        * If the rewrite mode is used embedded %-characters are replaced
+          to protect later % formatting.
+
+        The result can be formatted by util.format_explanation() for
+        pretty printing.
+        """
+        hook_result = ihook.pytest_assertrepr_compare(
+            config=item.config, op=op, left=left, right=right
+        )
+        for new_expl in hook_result:
+            if new_expl:
+                new_expl = truncate.truncate_if_required(new_expl, item)
+                new_expl = [line.replace("\n", "\\n") for line in new_expl]
+                res = "\n~".join(new_expl)
+                if item.config.getvalue("assertmode") == "rewrite":
+                    res = res.replace("%", "%%")
+                return res
+        return None
+
+    saved_assert_hooks = util._reprcompare, util._assertion_pass
+    util._reprcompare = callbinrepr
+    util._config = item.config
+
+    if ihook.pytest_assertion_pass.get_hookimpls():
+
+        def call_assertion_pass_hook(lineno: int, orig: str, expl: str) -> None:
+            ihook.pytest_assertion_pass(item=item, lineno=lineno, orig=orig, expl=expl)
+
+        util._assertion_pass = call_assertion_pass_hook
+
+    yield
+
+    util._reprcompare, util._assertion_pass = saved_assert_hooks
+    util._config = None
+
+
+def pytest_sessionfinish(session: "Session") -> None:
+    assertstate = session.config.stash.get(assertstate_key, None)
+    if assertstate:
+        if assertstate.hook is not None:
+            assertstate.hook.set_session(None)
+
+
+def pytest_assertrepr_compare(
+    config: Config, op: str, left: Any, right: Any
+) -> Optional[List[str]]:
+    return util.assertrepr_compare(config=config, op=op, left=left, right=right)

venv/lib/python3.11/site-packages/_pytest/assertion/truncate.py

@@ -0,0 +1,115 @@
+"""Utilities for truncating assertion output.
+
+Current default behaviour is to truncate assertion explanations at
+~8 terminal lines, unless running in "-vv" mode or running on CI.
+"""
+from typing import List
+from typing import Optional
+
+from _pytest.assertion import util
+from _pytest.nodes import Item
+
+
+DEFAULT_MAX_LINES = 8
+DEFAULT_MAX_CHARS = 8 * 80
+USAGE_MSG = "use '-vv' to show"
+
+
+def truncate_if_required(
+    explanation: List[str], item: Item, max_length: Optional[int] = None
+) -> List[str]:
+    """Truncate this assertion explanation if the given test item is eligible."""
+    if _should_truncate_item(item):
+        return _truncate_explanation(explanation)
+    return explanation
+
+
+def _should_truncate_item(item: Item) -> bool:
+    """Whether or not this test item is eligible for truncation."""
+    verbose = item.config.option.verbose
+    return verbose < 2 and not util.running_on_ci()
+
+
+def _truncate_explanation(
+    input_lines: List[str],
+    max_lines: Optional[int] = None,
+    max_chars: Optional[int] = None,
+) -> List[str]:
+    """Truncate given list of strings that makes up the assertion explanation.
+
+    Truncates to either 8 lines, or 640 characters - whichever the input reaches
+    first, taking the truncation explanation into account. The remaining lines
+    will be replaced by a usage message.
+    """
+    if max_lines is None:
+        max_lines = DEFAULT_MAX_LINES
+    if max_chars is None:
+        max_chars = DEFAULT_MAX_CHARS
+
+    # Check if truncation required
+    input_char_count = len("".join(input_lines))
+    # The length of the truncation explanation depends on the number of lines
+    # removed but is at least 68 characters:
+    # The real value is
+    # 64 (for the base message:
+    # '...\n...Full output truncated (1 line hidden), use '-vv' to show")'
+    # )
+    # + 1 (for plural)
+    # + int(math.log10(len(input_lines) - max_lines)) (number of hidden line, at least 1)
+    # + 3 for the '...' added to the truncated line
+    # But if there's more than 100 lines it's very likely that we're going to
+    # truncate, so we don't need the exact value using log10.
+    tolerable_max_chars = (
+        max_chars + 70  # 64 + 1 (for plural) + 2 (for '99') + 3 for '...'
+    )
+    # The truncation explanation add two lines to the output
+    tolerable_max_lines = max_lines + 2
+    if (
+        len(input_lines) <= tolerable_max_lines
+        and input_char_count <= tolerable_max_chars
+    ):
+        return input_lines
+    # Truncate first to max_lines, and then truncate to max_chars if necessary
+    truncated_explanation = input_lines[:max_lines]
+    truncated_char = True
+    # We reevaluate the need to truncate chars following removal of some lines
+    if len("".join(truncated_explanation)) > tolerable_max_chars:
+        truncated_explanation = _truncate_by_char_count(
+            truncated_explanation, max_chars
+        )
+    else:
+        truncated_char = False
+
+    truncated_line_count = len(input_lines) - len(truncated_explanation)
+    if truncated_explanation[-1]:
+        # Add ellipsis and take into account part-truncated final line
+        truncated_explanation[-1] = truncated_explanation[-1] + "..."
+        if truncated_char:
+            # It's possible that we did not remove any char from this line
+            truncated_line_count += 1
+    else:
+        # Add proper ellipsis when we were able to fit a full line exactly
+        truncated_explanation[-1] = "..."
+    return truncated_explanation + [
+        "",
+        f"...Full output truncated ({truncated_line_count} line"
+        f"{'' if truncated_line_count == 1 else 's'} hidden), {USAGE_MSG}",
+    ]
+
+
+def _truncate_by_char_count(input_lines: List[str], max_chars: int) -> List[str]:
+    # Find point at which input length exceeds total allowed length
+    iterated_char_count = 0
+    for iterated_index, input_line in enumerate(input_lines):
+        if iterated_char_count + len(input_line) > max_chars:
+            break
+        iterated_char_count += len(input_line)
+
+    # Create truncated explanation with modified final line
+    truncated_result = input_lines[:iterated_index]
+    final_line = input_lines[iterated_index]
+    if final_line:
+        final_line_truncate_point = max_chars - iterated_char_count
+        final_line = final_line[:final_line_truncate_point]
+    truncated_result.append(final_line)
+    return truncated_result

venv/lib/python3.11/site-packages/_pytest/assertion/util.py

@@ -0,0 +1,522 @@
+"""Utilities for assertion debugging."""
+import collections.abc
+import os
+import pprint
+from typing import AbstractSet
+from typing import Any
+from typing import Callable
+from typing import Iterable
+from typing import List
+from typing import Mapping
+from typing import Optional
+from typing import Sequence
+from unicodedata import normalize
+
+import _pytest._code
+from _pytest import outcomes
+from _pytest._io.saferepr import _pformat_dispatch
+from _pytest._io.saferepr import saferepr
+from _pytest._io.saferepr import saferepr_unlimited
+from _pytest.config import Config
+
+# The _reprcompare attribute on the util module is used by the new assertion
+# interpretation code and assertion rewriter to detect this plugin was
+# loaded and in turn call the hooks defined here as part of the
+# DebugInterpreter.
+_reprcompare: Optional[Callable[[str, object, object], Optional[str]]] = None
+
+# Works similarly as _reprcompare attribute. Is populated with the hook call
+# when pytest_runtest_setup is called.
+_assertion_pass: Optional[Callable[[int, str, str], None]] = None
+
+# Config object which is assigned during pytest_runtest_protocol.
+_config: Optional[Config] = None
+
+
+def format_explanation(explanation: str) -> str:
+    r"""Format an explanation.
+
+    Normally all embedded newlines are escaped, however there are
+    three exceptions: \n{, \n} and \n~.  The first two are intended
+    cover nested explanations, see function and attribute explanations
+    for examples (.visit_Call(), visit_Attribute()).  The last one is
+    for when one explanation needs to span multiple lines, e.g. when
+    displaying diffs.
+    """
+    lines = _split_explanation(explanation)
+    result = _format_lines(lines)
+    return "\n".join(result)
+
+
+def _split_explanation(explanation: str) -> List[str]:
+    r"""Return a list of individual lines in the explanation.
+
+    This will return a list of lines split on '\n{', '\n}' and '\n~'.
+    Any other newlines will be escaped and appear in the line as the
+    literal '\n' characters.
+    """
+    raw_lines = (explanation or "").split("\n")
+    lines = [raw_lines[0]]
+    for values in raw_lines[1:]:
+        if values and values[0] in ["{", "}", "~", ">"]:
+            lines.append(values)
+        else:
+            lines[-1] += "\\n" + values
+    return lines
+
+
+def _format_lines(lines: Sequence[str]) -> List[str]:
+    """Format the individual lines.
+
+    This will replace the '{', '}' and '~' characters of our mini formatting
+    language with the proper 'where ...', 'and ...' and ' + ...' text, taking
+    care of indentation along the way.
+
+    Return a list of formatted lines.
+    """
+    result = list(lines[:1])
+    stack = [0]
+    stackcnt = [0]
+    for line in lines[1:]:
+        if line.startswith("{"):
+            if stackcnt[-1]:
+                s = "and   "
+            else:
+                s = "where "
+            stack.append(len(result))
+            stackcnt[-1] += 1
+            stackcnt.append(0)
+            result.append(" +" + "  " * (len(stack) - 1) + s + line[1:])
+        elif line.startswith("}"):
+            stack.pop()
+            stackcnt.pop()
+            result[stack[-1]] += line[1:]
+        else:
+            assert line[0] in ["~", ">"]
+            stack[-1] += 1
+            indent = len(stack) if line.startswith("~") else len(stack) - 1
+            result.append("  " * indent + line[1:])
+    assert len(stack) == 1
+    return result
+
+
+def issequence(x: Any) -> bool:
+    return isinstance(x, collections.abc.Sequence) and not isinstance(x, str)
+
+
+def istext(x: Any) -> bool:
+    return isinstance(x, str)
+
+
+def isdict(x: Any) -> bool:
+    return isinstance(x, dict)
+
+
+def isset(x: Any) -> bool:
+    return isinstance(x, (set, frozenset))
+
+
+def isnamedtuple(obj: Any) -> bool:
+    return isinstance(obj, tuple) and getattr(obj, "_fields", None) is not None
+
+
+def isdatacls(obj: Any) -> bool:
+    return getattr(obj, "__dataclass_fields__", None) is not None
+
+
+def isattrs(obj: Any) -> bool:
+    return getattr(obj, "__attrs_attrs__", None) is not None
+
+
+def isiterable(obj: Any) -> bool:
+    try:
+        iter(obj)
+        return not istext(obj)
+    except TypeError:
+        return False
+
+
+def has_default_eq(
+    obj: object,
+) -> bool:
+    """Check if an instance of an object contains the default eq
+
+    First, we check if the object's __eq__ attribute has __code__,
+    if so, we check the equally of the method code filename (__code__.co_filename)
+    to the default one generated by the dataclass and attr module
+    for dataclasses the default co_filename is <string>, for attrs class, the __eq__ should contain "attrs eq generated"
+    """
+    # inspired from https://github.com/willmcgugan/rich/blob/07d51ffc1aee6f16bd2e5a25b4e82850fb9ed778/rich/pretty.py#L68
+    if hasattr(obj.__eq__, "__code__") and hasattr(obj.__eq__.__code__, "co_filename"):
+        code_filename = obj.__eq__.__code__.co_filename
+
+        if isattrs(obj):
+            return "attrs generated eq" in code_filename
+
+        return code_filename == "<string>"  # data class
+    return True
+
+
+def assertrepr_compare(
+    config, op: str, left: Any, right: Any, use_ascii: bool = False
+) -> Optional[List[str]]:
+    """Return specialised explanations for some operators/operands."""
+    verbose = config.getoption("verbose")
+
+    # Strings which normalize equal are often hard to distinguish when printed; use ascii() to make this easier.
+    # See issue #3246.
+    use_ascii = (
+        isinstance(left, str)
+        and isinstance(right, str)
+        and normalize("NFD", left) == normalize("NFD", right)
+    )
+
+    if verbose > 1:
+        left_repr = saferepr_unlimited(left, use_ascii=use_ascii)
+        right_repr = saferepr_unlimited(right, use_ascii=use_ascii)
+    else:
+        # XXX: "15 chars indentation" is wrong
+        #      ("E       AssertionError: assert "); should use term width.
+        maxsize = (
+            80 - 15 - len(op) - 2
+        ) // 2  # 15 chars indentation, 1 space around op
+
+        left_repr = saferepr(left, maxsize=maxsize, use_ascii=use_ascii)
+        right_repr = saferepr(right, maxsize=maxsize, use_ascii=use_ascii)
+
+    summary = f"{left_repr} {op} {right_repr}"
+
+    explanation = None
+    try:
+        if op == "==":
+            explanation = _compare_eq_any(left, right, verbose)
+        elif op == "not in":
+            if istext(left) and istext(right):
+                explanation = _notin_text(left, right, verbose)
+    except outcomes.Exit:
+        raise
+    except Exception:
+        explanation = [
+            "(pytest_assertion plugin: representation of details failed: {}.".format(
+                _pytest._code.ExceptionInfo.from_current()._getreprcrash()
+            ),
+            " Probably an object has a faulty __repr__.)",
+        ]
+
+    if not explanation:
+        return None
+
+    return [summary] + explanation
+
+
+def _compare_eq_any(left: Any, right: Any, verbose: int = 0) -> List[str]:
+    explanation = []
+    if istext(left) and istext(right):
+        explanation = _diff_text(left, right, verbose)
+    else:
+        from _pytest.python_api import ApproxBase
+
+        if isinstance(left, ApproxBase) or isinstance(right, ApproxBase):
+            # Although the common order should be obtained == expected, this ensures both ways
+            approx_side = left if isinstance(left, ApproxBase) else right
+            other_side = right if isinstance(left, ApproxBase) else left
+
+            explanation = approx_side._repr_compare(other_side)
+        elif type(left) == type(right) and (
+            isdatacls(left) or isattrs(left) or isnamedtuple(left)
+        ):
+            # Note: unlike dataclasses/attrs, namedtuples compare only the
+            # field values, not the type or field names. But this branch
+            # intentionally only handles the same-type case, which was often
+            # used in older code bases before dataclasses/attrs were available.
+            explanation = _compare_eq_cls(left, right, verbose)
+        elif issequence(left) and issequence(right):
+            explanation = _compare_eq_sequence(left, right, verbose)
+        elif isset(left) and isset(right):
+            explanation = _compare_eq_set(left, right, verbose)
+        elif isdict(left) and isdict(right):
+            explanation = _compare_eq_dict(left, right, verbose)
+
+        if isiterable(left) and isiterable(right):
+            expl = _compare_eq_iterable(left, right, verbose)
+            explanation.extend(expl)
+
+    return explanation
+
+
+def _diff_text(left: str, right: str, verbose: int = 0) -> List[str]:
+    """Return the explanation for the diff between text.
+
+    Unless --verbose is used this will skip leading and trailing
+    characters which are identical to keep the diff minimal.
+    """
+    from difflib import ndiff
+
+    explanation: List[str] = []
+
+    if verbose < 1:
+        i = 0  # just in case left or right has zero length
+        for i in range(min(len(left), len(right))):
+            if left[i] != right[i]:
+                break
+        if i > 42:
+            i -= 10  # Provide some context
+            explanation = [
+                "Skipping %s identical leading characters in diff, use -v to show" % i
+            ]
+            left = left[i:]
+            right = right[i:]
+        if len(left) == len(right):
+            for i in range(len(left)):
+                if left[-i] != right[-i]:
+                    break
+            if i > 42:
+                i -= 10  # Provide some context
+                explanation += [
+                    "Skipping {} identical trailing "
+                    "characters in diff, use -v to show".format(i)
+                ]
+                left = left[:-i]
+                right = right[:-i]
+    keepends = True
+    if left.isspace() or right.isspace():
+        left = repr(str(left))
+        right = repr(str(right))
+        explanation += ["Strings contain only whitespace, escaping them using repr()"]
+    # "right" is the expected base against which we compare "left",
+    # see https://github.com/pytest-dev/pytest/issues/3333
+    explanation += [
+        line.strip("\n")
+        for line in ndiff(right.splitlines(keepends), left.splitlines(keepends))
+    ]
+    return explanation
+
+
+def _surrounding_parens_on_own_lines(lines: List[str]) -> None:
+    """Move opening/closing parenthesis/bracket to own lines."""
+    opening = lines[0][:1]
+    if opening in ["(", "[", "{"]:
+        lines[0] = " " + lines[0][1:]
+        lines[:] = [opening] + lines
+    closing = lines[-1][-1:]
+    if closing in [")", "]", "}"]:
+        lines[-1] = lines[-1][:-1] + ","
+        lines[:] = lines + [closing]
+
+
+def _compare_eq_iterable(
+    left: Iterable[Any], right: Iterable[Any], verbose: int = 0
+) -> List[str]:
+    if verbose <= 0 and not running_on_ci():
+        return ["Use -v to get more diff"]
+    # dynamic import to speedup pytest
+    import difflib
+
+    left_formatting = pprint.pformat(left).splitlines()
+    right_formatting = pprint.pformat(right).splitlines()
+
+    # Re-format for different output lengths.
+    lines_left = len(left_formatting)
+    lines_right = len(right_formatting)
+    if lines_left != lines_right:
+        left_formatting = _pformat_dispatch(left).splitlines()
+        right_formatting = _pformat_dispatch(right).splitlines()
+
+    if lines_left > 1 or lines_right > 1:
+        _surrounding_parens_on_own_lines(left_formatting)
+        _surrounding_parens_on_own_lines(right_formatting)
+
+    explanation = ["Full diff:"]
+    # "right" is the expected base against which we compare "left",
+    # see https://github.com/pytest-dev/pytest/issues/3333
+    explanation.extend(
+        line.rstrip() for line in difflib.ndiff(right_formatting, left_formatting)
+    )
+    return explanation
+
+
+def _compare_eq_sequence(
+    left: Sequence[Any], right: Sequence[Any], verbose: int = 0
+) -> List[str]:
+    comparing_bytes = isinstance(left, bytes) and isinstance(right, bytes)
+    explanation: List[str] = []
+    len_left = len(left)
+    len_right = len(right)
+    for i in range(min(len_left, len_right)):
+        if left[i] != right[i]:
+            if comparing_bytes:
+                # when comparing bytes, we want to see their ascii representation
+                # instead of their numeric values (#5260)
+                # using a slice gives us the ascii representation:
+                # >>> s = b'foo'
+                # >>> s[0]
+                # 102
+                # >>> s[0:1]
+                # b'f'
+                left_value = left[i : i + 1]
+                right_value = right[i : i + 1]
+            else:
+                left_value = left[i]
+                right_value = right[i]
+
+            explanation += [f"At index {i} diff: {left_value!r} != {right_value!r}"]
+            break
+
+    if comparing_bytes:
+        # when comparing bytes, it doesn't help to show the "sides contain one or more
+        # items" longer explanation, so skip it
+
+        return explanation
+
+    len_diff = len_left - len_right
+    if len_diff:
+        if len_diff > 0:
+            dir_with_more = "Left"
+            extra = saferepr(left[len_right])
+        else:
+            len_diff = 0 - len_diff
+            dir_with_more = "Right"
+            extra = saferepr(right[len_left])
+
+        if len_diff == 1:
+            explanation += [f"{dir_with_more} contains one more item: {extra}"]
+        else:
+            explanation += [
+                "%s contains %d more items, first extra item: %s"
+                % (dir_with_more, len_diff, extra)
+            ]
+    return explanation
+
+
+def _compare_eq_set(
+    left: AbstractSet[Any], right: AbstractSet[Any], verbose: int = 0
+) -> List[str]:
+    explanation = []
+    diff_left = left - right
+    diff_right = right - left
+    if diff_left:
+        explanation.append("Extra items in the left set:")
+        for item in diff_left:
+            explanation.append(saferepr(item))
+    if diff_right:
+        explanation.append("Extra items in the right set:")
+        for item in diff_right:
+            explanation.append(saferepr(item))
+    return explanation
+
+
+def _compare_eq_dict(
+    left: Mapping[Any, Any], right: Mapping[Any, Any], verbose: int = 0
+) -> List[str]:
+    explanation: List[str] = []
+    set_left = set(left)
+    set_right = set(right)
+    common = set_left.intersection(set_right)
+    same = {k: left[k] for k in common if left[k] == right[k]}
+    if same and verbose < 2:
+        explanation += ["Omitting %s identical items, use -vv to show" % len(same)]
+    elif same:
+        explanation += ["Common items:"]
+        explanation += pprint.pformat(same).splitlines()
+    diff = {k for k in common if left[k] != right[k]}
+    if diff:
+        explanation += ["Differing items:"]
+        for k in diff:
+            explanation += [saferepr({k: left[k]}) + " != " + saferepr({k: right[k]})]
+    extra_left = set_left - set_right
+    len_extra_left = len(extra_left)
+    if len_extra_left:
+        explanation.append(
+            "Left contains %d more item%s:"
+            % (len_extra_left, "" if len_extra_left == 1 else "s")
+        )
+        explanation.extend(
+            pprint.pformat({k: left[k] for k in extra_left}).splitlines()
+        )
+    extra_right = set_right - set_left
+    len_extra_right = len(extra_right)
+    if len_extra_right:
+        explanation.append(
+            "Right contains %d more item%s:"
+            % (len_extra_right, "" if len_extra_right == 1 else "s")
+        )
+        explanation.extend(
+            pprint.pformat({k: right[k] for k in extra_right}).splitlines()
+        )
+    return explanation
+
+
+def _compare_eq_cls(left: Any, right: Any, verbose: int) -> List[str]:
+    if not has_default_eq(left):
+        return []
+    if isdatacls(left):
+        import dataclasses
+
+        all_fields = dataclasses.fields(left)
+        fields_to_check = [info.name for info in all_fields if info.compare]
+    elif isattrs(left):
+        all_fields = left.__attrs_attrs__
+        fields_to_check = [field.name for field in all_fields if getattr(field, "eq")]
+    elif isnamedtuple(left):
+        fields_to_check = left._fields
+    else:
+        assert False
+
+    indent = "  "
+    same = []
+    diff = []
+    for field in fields_to_check:
+        if getattr(left, field) == getattr(right, field):
+            same.append(field)
+        else:
+            diff.append(field)
+
+    explanation = []
+    if same or diff:
+        explanation += [""]
+    if same and verbose < 2:
+        explanation.append("Omitting %s identical items, use -vv to show" % len(same))
+    elif same:
+        explanation += ["Matching attributes:"]
+        explanation += pprint.pformat(same).splitlines()
+    if diff:
+        explanation += ["Differing attributes:"]
+        explanation += pprint.pformat(diff).splitlines()
+        for field in diff:
+            field_left = getattr(left, field)
+            field_right = getattr(right, field)
+            explanation += [
+                "",
+                "Drill down into differing attribute %s:" % field,
+                ("%s%s: %r != %r") % (indent, field, field_left, field_right),
+            ]
+            explanation += [
+                indent + line
+                for line in _compare_eq_any(field_left, field_right, verbose)
+            ]
+    return explanation
+
+
+def _notin_text(term: str, text: str, verbose: int = 0) -> List[str]:
+    index = text.find(term)
+    head = text[:index]
+    tail = text[index + len(term) :]
+    correct_text = head + tail
+    diff = _diff_text(text, correct_text, verbose)
+    newdiff = ["%s is contained here:" % saferepr(term, maxsize=42)]
+    for line in diff:
+        if line.startswith("Skipping"):
+            continue
+        if line.startswith("- "):
+            continue
+        if line.startswith("+ "):
+            newdiff.append("  " + line[2:])
+        else:
+            newdiff.append(line)
+    return newdiff
+
+
+def running_on_ci() -> bool:
+    """Check if we're currently running on a CI system."""
+    env_vars = ["CI", "BUILD_NUMBER"]
+    return any(var in os.environ for var in env_vars)