testing/code/test_source.py - main - niceSOFT/python3-pytest

testing/code/test_source.py
708 строк17 KB
Zac Hatfield-Dodds
Fix missing traceback source for code with cwd-relative filenames (#14744)
21 июл 2026, 16:32
21 июл 2026, 16:3234b6a4e
# mypy: allow-untyped-defs
from __future__ import annotations

import inspect
import linecache
from pathlib import Path
import sys
import textwrap
from typing import Any
from unittest.mock import patch

from _pytest._code import Code
from _pytest._code import Frame
from _pytest._code import getfslineno
from _pytest._code import Source
from _pytest.pathlib import import_path
import pytest


def test_source_str_function() -> None:
    x = Source("3")
    assert str(x) == "3"

    x = Source("   3")
    assert str(x) == "3"

    x = Source(
        """
        3
        """
    )
    assert str(x) == "\n3"


def test_source_from_function() -> None:
    source = Source(test_source_str_function)
    assert str(source).startswith("def test_source_str_function() -> None:")


def test_source_from_method() -> None:
    class TestClass:
        def test_method(self):
            pass

    source = Source(TestClass().test_method)
    assert source.lines == ["def test_method(self):", "    pass"]


def test_source_from_lines() -> None:
    lines = ["a \n", "b\n", "c"]
    source = Source(lines)
    assert source.lines == ["a ", "b", "c"]


def test_source_from_inner_function() -> None:
    def f():
        raise NotImplementedError()

    source = Source(f)
    assert str(source).startswith("def f():")


def test_source_strips() -> None:
    source = Source("")
    assert source == Source()
    assert str(source) == ""
    assert source.strip() == source


def test_source_strip_multiline() -> None:
    source = Source()
    source.lines = ["", " hello", "  "]
    source2 = source.strip()
    assert source2.lines == [" hello"]


class TestAccesses:
    def setup_class(self) -> None:
        self.source = Source(
            """\
            def f(x):
                pass
            def g(x):
                pass
        """
        )

    def test_getrange(self) -> None:
        x = self.source[0:2]
        assert len(x.lines) == 2
        assert str(x) == "def f(x):\n    pass"

    def test_getrange_step_not_supported(self) -> None:
        with pytest.raises(IndexError, match=r"step"):
            self.source[::2]

    def test_getline(self) -> None:
        x = self.source[0]
        assert x == "def f(x):"

    def test_len(self) -> None:
        assert len(self.source) == 4

    def test_iter(self) -> None:
        values = [x for x in self.source]
        assert len(values) == 4


class TestSourceParsing:
    def setup_class(self) -> None:
        self.source = Source(
            """\
            def f(x):
                assert (x ==
                        3 +
                        4)
        """
        ).strip()

    def test_getstatement(self) -> None:
        # print str(self.source)
        ass = str(self.source[1:])
        for i in range(1, 4):
            # print "trying start in line %r" % self.source[i]
            s = self.source.getstatement(i)
            # x = s.deindent()
            assert str(s) == ass

    def test_getstatementrange_triple_quoted(self) -> None:
        # print str(self.source)
        source = Source(
            """hello('''
        ''')"""
        )
        s = source.getstatement(0)
        assert s == source
        s = source.getstatement(1)
        assert s == source

    def test_getstatementrange_within_constructs(self) -> None:
        source = Source(
            """\
            try:
                try:
                    raise ValueError
                except SomeThing:
                    pass
            finally:
                42
        """
        )
        assert len(source) == 7
        # check all lineno's that could occur in a traceback
        # assert source.getstatementrange(0) == (0, 7)
        # assert source.getstatementrange(1) == (1, 5)
        assert source.getstatementrange(2) == (2, 3)
        assert source.getstatementrange(3) == (3, 4)
        assert source.getstatementrange(4) == (4, 5)
        # assert source.getstatementrange(5) == (0, 7)
        assert source.getstatementrange(6) == (6, 7)

    def test_getstatementrange_bug(self) -> None:
        source = Source(
            """\
            try:
                x = (
                   y +
                   z)
            except:
                pass
        """
        )
        assert len(source) == 6
        assert source.getstatementrange(2) == (1, 4)

    def test_getstatementrange_bug2(self) -> None:
        source = Source(
            """\
            assert (
                33
                ==
                [
                  X(3,
                      b=1, c=2
                   ),
                ]
              )
        """
        )
        assert len(source) == 9
        assert source.getstatementrange(5) == (0, 9)

    def test_getstatementrange_ast_issue58(self) -> None:
        source = Source(
            """\

            def test_some():
                for a in [a for a in
                    CAUSE_ERROR]: pass

            x = 3
        """
        )
        assert getstatement(2, source).lines == source.lines[2:3]
        assert getstatement(3, source).lines == source.lines[3:4]

    def test_getstatementrange_out_of_bounds_py3(self) -> None:
        source = Source("if xxx:\n   from .collections import something")
        r = source.getstatementrange(1)
        assert r == (1, 2)

    def test_getstatementrange_with_syntaxerror_issue7(self) -> None:
        source = Source(":")
        with pytest.raises(SyntaxError):
            source.getstatementrange(0)


def test_getstartingblock_singleline() -> None:
    class A:
        def __init__(self, *args) -> None:
            frame = sys._getframe(1)
            self.source = Frame(frame).statement

    x = A("x", "y")

    values = [i for i in x.source.lines if i.strip()]
    assert len(values) == 1


def test_getline_finally() -> None:
    def c() -> None:
        pass

    with pytest.raises(TypeError) as excinfo:
        teardown = None
        try:
            c(1)  # type: ignore
        finally:
            if teardown:
                teardown()  # type: ignore[unreachable]
    source = excinfo.traceback[-1].statement
    assert str(source).strip() == "c(1)  # type: ignore"


def test_getfuncsource_dynamic() -> None:
    def f():
        raise NotImplementedError()

    def g():
        pass  # pragma: no cover

    f_source = Source(f)
    g_source = Source(g)
    assert str(f_source).strip() == "def f():\n    raise NotImplementedError()"
    assert str(g_source).strip() == "def g():\n    pass  # pragma: no cover"


def test_getfuncsource_with_multiline_string() -> None:
    def f():
        c = """while True:
    pass
"""

    expected = '''\
    def f():
        c = """while True:
    pass
"""
'''
    assert str(Source(f)) == expected.rstrip()


def test_deindent() -> None:
    from _pytest._code.source import deindent as deindent

    assert deindent(["\tfoo", "\tbar"]) == ["foo", "bar"]

    source = """\
        def f():
            def g():
                pass
    """
    lines = deindent(source.splitlines())
    assert lines == ["def f():", "    def g():", "        pass"]


def test_source_of_class_at_eof_without_newline(_sys_snapshot, tmp_path: Path) -> None:
    # this test fails because the implicit inspect.getsource(A) below
    # does not return the "x = 1" last line.
    source = Source(
        """
        class A:
            def method(self):
                x = 1
    """
    )
    path = tmp_path.joinpath("a.py")
    path.write_text(str(source), encoding="utf-8")
    mod: Any = import_path(path, root=tmp_path, consider_namespace_packages=False)
    s2 = Source(mod.A)
    assert str(source).strip() == str(s2).strip()


if True:

    def x():
        pass


def test_source_fallback() -> None:
    src = Source(x)
    expected = """def x():
    pass"""
    assert str(src) == expected


def test_findsource_fallback() -> None:
    from _pytest._code.source import findsource

    src, lineno = findsource(x)
    assert src is not None
    assert "test_findsource_simple" in str(src)
    assert src[lineno] == "    def x():"


def test_findsource(monkeypatch) -> None:
    from _pytest._code.source import findsource

    filename = "<pytest-test_findsource>"
    lines = ["if 1:\n", "    def x():\n", "          pass\n"]
    co = compile("".join(lines), filename, "exec")

    monkeypatch.setitem(linecache.cache, filename, (1, None, lines, filename))

    src, lineno = findsource(co)
    assert src is not None
    assert "if 1:" in str(src)

    d: dict[str, Any] = {}
    eval(co, d)
    src, lineno = findsource(d["x"])
    assert src is not None
    assert "if 1:" in str(src)
    assert src[lineno] == "    def x():"


def test_findsource_filename_relative_to_syspath_entry(
    monkeypatch: pytest.MonkeyPatch, tmp_path: Path
) -> None:
    """findsource() falls back to searching sys.path for code objects whose
    co_filename is relative to a directory other than the cwd, like the
    standard traceback module does (#1139).

    This happens e.g. with compiled Cython modules, whose code objects
    carry paths relative to the project root, when pytest is run from a
    subdirectory.
    """
    from _pytest._code.source import findsource

    filename = "findsource_syspath_demo.py"
    lines = ["def f():\n", "    return 1\n"]
    (tmp_path / filename).write_text("".join(lines), encoding="utf-8")
    co = compile("".join(lines), filename, "exec")
    d: dict[str, Any] = {}
    eval(co, d)

    empty = tmp_path / "empty"
    empty.mkdir()
    monkeypatch.chdir(empty)
    monkeypatch.syspath_prepend(str(tmp_path))

    src, lineno = findsource(d["f"].__code__)
    assert src is not None
    assert lineno == 0
    assert src[lineno] == "def f():"


def test_getfslineno() -> None:
    def f(x) -> None:
        raise NotImplementedError()

    fspath, lineno = getfslineno(f)

    assert isinstance(fspath, Path)
    assert fspath.name == "test_source.py"
    assert lineno == f.__code__.co_firstlineno - 1  # see findsource

    class A:
        pass

    fspath, lineno = getfslineno(A)

    _, A_lineno = inspect.findsource(A)
    assert isinstance(fspath, Path)
    assert fspath.name == "test_source.py"
    assert lineno == A_lineno

    assert getfslineno(3) == ("", -1)

    class B:
        pass

    B.__name__ = B.__qualname__ = "B2"
    # Since Python 3.13 this started working.
    if sys.version_info >= (3, 13):
        assert getfslineno(B)[1] != -1
    else:
        assert getfslineno(B)[1] == -1


def test_code_of_object_instance_with_call() -> None:
    class A:
        pass

    with pytest.raises(TypeError):
        Source(A())

    class WithCall:
        def __call__(self) -> None:
            pass

    code = Code.from_function(WithCall())
    assert "pass" in str(code.source())

    class Hello:
        def __call__(self) -> None:
            pass

    with pytest.raises(TypeError):
        Code.from_function(Hello)


def getstatement(lineno: int, source) -> Source:
    from _pytest._code.source import getstatementrange_ast

    src = Source(source)
    _ast, start, end = getstatementrange_ast(lineno, src)
    return src[start:end]


def test_oneline() -> None:
    source = getstatement(0, "raise ValueError")
    assert str(source) == "raise ValueError"


def test_comment_and_no_newline_at_end() -> None:
    from _pytest._code.source import getstatementrange_ast

    source = Source(
        [
            "def test_basic_complex():",
            "    assert 1 == 2",
            "# vim: filetype=pyopencl:fdm=marker",
        ]
    )
    _ast, _start, end = getstatementrange_ast(1, source)
    assert end == 2


def test_oneline_and_comment() -> None:
    source = getstatement(0, "raise ValueError\n#hello")
    assert str(source) == "raise ValueError"


def test_comments() -> None:
    source = '''def test():
    "comment 1"
    x = 1
      # comment 2
    # comment 3

    assert False

"""
comment 4
"""
'''
    for line in range(2, 6):
        assert str(getstatement(line, source)) == "    x = 1"
    for line in range(6, 8):
        assert str(getstatement(line, source)) == "    assert False"
    for line in range(8, 10):
        assert str(getstatement(line, source)) == '"""\ncomment 4\n"""'


def test_comment_in_statement() -> None:
    source = """test(foo=1,
    # comment 1
    bar=2)
"""
    for line in range(1, 3):
        assert (
            str(getstatement(line, source))
            == "test(foo=1,\n    # comment 1\n    bar=2)"
        )


def test_source_with_decorator() -> None:
    """Test behavior with Source / Code().source with regard to decorators."""

    @pytest.mark.foo
    def deco_mark():
        assert False

    src = inspect.getsource(deco_mark)
    assert textwrap.indent(str(Source(deco_mark)), "    ") + "\n" == src
    assert src.startswith("    @pytest.mark.foo")

    @pytest.fixture
    def deco_fixture():
        assert False

    src = inspect.getsource(deco_fixture._get_wrapped_function())
    assert src == "    @pytest.fixture\n    def deco_fixture():\n        assert False\n"
    # Make sure the decorator is not a wrapped function
    assert not str(Source(deco_fixture)).startswith("@functools.wraps(function)")
    assert (
        textwrap.indent(str(Source(deco_fixture._get_wrapped_function())), "    ")
        + "\n"
        == src
    )


def test_single_line_else() -> None:
    source = getstatement(1, "if False: 2\nelse: 3")
    assert str(source) == "else: 3"


def test_single_line_finally() -> None:
    source = getstatement(1, "try: 1\nfinally: 3")
    assert str(source) == "finally: 3"


def test_issue55() -> None:
    source = (
        "def round_trip(dinp):\n  assert 1 == dinp\n"
        'def test_rt():\n  round_trip("""\n""")\n'
    )
    s = getstatement(3, source)
    assert str(s) == '  round_trip("""\n""")'


def test_multiline() -> None:
    source = getstatement(
        0,
        """\
raise ValueError(
    23
)
x = 3
""",
    )
    assert str(source) == "raise ValueError(\n    23\n)"


class TestTry:
    def setup_class(self) -> None:
        self.source = """\
try:
    raise ValueError
except Something:
    raise IndexError(1)
else:
    raise KeyError()
"""

    def test_body(self) -> None:
        source = getstatement(1, self.source)
        assert str(source) == "    raise ValueError"

    def test_except_line(self) -> None:
        source = getstatement(2, self.source)
        assert str(source) == "except Something:"

    def test_except_body(self) -> None:
        source = getstatement(3, self.source)
        assert str(source) == "    raise IndexError(1)"

    def test_else(self) -> None:
        source = getstatement(5, self.source)
        assert str(source) == "    raise KeyError()"


class TestTryFinally:
    def setup_class(self) -> None:
        self.source = """\
try:
    raise ValueError
finally:
    raise IndexError(1)
"""

    def test_body(self) -> None:
        source = getstatement(1, self.source)
        assert str(source) == "    raise ValueError"

    def test_finally(self) -> None:
        source = getstatement(3, self.source)
        assert str(source) == "    raise IndexError(1)"


class TestIf:
    def setup_class(self) -> None:
        self.source = """\
if 1:
    y = 3
elif False:
    y = 5
else:
    y = 7
"""

    def test_body(self) -> None:
        source = getstatement(1, self.source)
        assert str(source) == "    y = 3"

    def test_elif_clause(self) -> None:
        source = getstatement(2, self.source)
        assert str(source) == "elif False:"

    def test_elif(self) -> None:
        source = getstatement(3, self.source)
        assert str(source) == "    y = 5"

    def test_else(self) -> None:
        source = getstatement(5, self.source)
        assert str(source) == "    y = 7"


def test_semicolon() -> None:
    s = """\
hello ; pytest.skip()
"""
    source = getstatement(0, s)
    assert str(source) == s.strip()


def test_def_online() -> None:
    s = """\
def func(): raise ValueError(42)

def something():
    pass
"""
    source = getstatement(0, s)
    assert str(source) == "def func(): raise ValueError(42)"


def test_decorator() -> None:
    s = """\
def foo(f):
    pass

@foo
def bar():
    pass
    """
    source = getstatement(3, s)
    assert "@foo" in str(source)


def XXX_test_expression_multiline() -> None:
    source = """\
something
'''
'''"""
    result = getstatement(1, source)
    assert str(result) == "'''\n'''"


def test_getstartingblock_multiline() -> None:
    class A:
        def __init__(self, *args):
            frame = sys._getframe(1)
            self.source = Frame(frame).statement

    # fmt: off
    x = A('x',
          'y'
          ,
          'z')
    # fmt: on
    values = [i for i in x.source.lines if i.strip()]
    assert len(values) == 4


def test_patched_compile() -> None:
    # ensure Source doesn't break
    # when compile() modifies code dynamically
    from builtins import compile

    def patched_compile1(_, *args, **kwargs):
        return compile("", *args, **kwargs)

    with patch("builtins.compile", new=patched_compile1):
        Source(patched_compile1).getstatement(1)

    # fmt: off
    def patched_compile2(_, *args, **kwargs):

        # first line of this function (the one above this one) must be empty
        # LINES must be equal or higher than number of lines of this function
        LINES = 99
        return compile("\ndef a():\n" + "\n" * LINES + "    pass", *args, **kwargs)
    # fmt: on

    with patch("builtins.compile", new=patched_compile2):
        Source(patched_compile2).getstatement(1)