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Copy pathtest_whatsleft.py
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841 lines (742 loc) · 28.6 KB
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"""Tests for whats_left's selected top-level reference discovery.
Checks for ambiguity in whats_left's flattened reference inventory.
Tests for scan coverage and reference-signature error accounting.
"""
import ast
import inspect
import io
import json
import os
import pathlib
import re
import sys
import tempfile
import types
import unittest
import warnings
from contextlib import redirect_stdout
SOURCE = pathlib.Path(__file__).resolve().parents[1] / "whats_left.py"
tree = ast.parse(SOURCE.read_text(encoding="utf-8"))
names = {
"record_reference_discovery",
"scan_modules",
"gen_modules",
"record_reference_issue",
"reference_direct_names",
"ensure_reference_class_scope",
}
nodes = [
node
for node in tree.body
if isinstance(node, ast.FunctionDef) and node.name in names
]
discovery_namespace = {
"_discovery_type": type,
"_discovery_str": str,
"_discovery_len": len,
"_MAX_DISCOVERY_RECORDS": 16384,
"_MAX_DISCOVERY_CHARS": 1048576,
"_reference_type": type,
"_reference_str": str,
"_reference_len": len,
"_reference_set": set,
"_reference_sum": sum,
"_reference_any": any,
"_reference_chars_used": [0],
"_MAX_REFERENCE_FIELD_CHARS": 4096,
"_MAX_REFERENCE_TOTAL_CHARS": 32768,
"_MAX_REFERENCE_ISSUES": 1024,
"reference_inventory_diagnostics": {"issues": [], "truncated": False},
"reference_class_selection": {},
"warnings": warnings,
"sys": sys,
}
exec(
compile(ast.Module(nodes, type_ignores=[]), str(SOURCE), "exec"),
discovery_namespace,
)
class DiscoveryTests(unittest.TestCase):
def setUp(self):
self.original = discovery_namespace.copy()
discovery_namespace.update(
reference_discovery={
"names": [],
"ignored": [],
"scanner_errors": [],
"truncated": False,
},
_discovery_chars=[0],
)
def tearDown(self):
discovery_namespace.clear()
discovery_namespace.update(self.original)
def test_scanner_errors_do_not_change_selection(self):
class Scanner:
def run(self, callback, onerror):
callback(None, "ok", None)
onerror("broken.child")
onerror("broken")
onerror("broken")
discovery_namespace["ModuleScanner"] = Scanner
self.assertEqual(discovery_namespace["scan_modules"](), ["ok", "broken"])
self.assertEqual(
discovery_namespace["reference_discovery"]["scanner_errors"],
["broken.child", "broken", "broken"],
)
def test_discovery_records_ignored_and_failed_names(self):
discovery_namespace.update(
scan_modules=lambda: ["ok", "bad", "skip"],
name_sort_key=lambda name: name,
IGNORED_MODULES={"skip"},
dir_of_mod_or_error=lambda name, keep_other: (
ImportError("bad") if name == "bad" else {}
),
import_module=lambda name: types.ModuleType(name),
BUILTIN_TYPES=[],
)
modules, _failed = discovery_namespace["gen_modules"]()
self.assertEqual(set(modules), {"ok"})
self.assertEqual(
discovery_namespace["reference_discovery"]["names"], ["bad", "ok", "skip"]
)
self.assertEqual(
discovery_namespace["reference_discovery"]["ignored"], ["skip"]
)
def test_sorted_lookup_precedes_scanner_execution(self):
events = []
def original_sorted(items, **kwargs):
events.append("original")
return sorted(items, **kwargs)
def replacement_sorted(items, **kwargs):
events.append("replacement")
return sorted(items, **kwargs)
def scan():
discovery_namespace["sorted"] = replacement_sorted
return []
discovery_namespace.update(
sorted=original_sorted,
scan_modules=scan,
name_sort_key=lambda name: name,
IGNORED_MODULES=set(),
)
discovery_namespace["gen_modules"]()
self.assertEqual(events, ["original"])
def test_record_count_and_name_lengths_are_bounded(self):
discovery_namespace["_MAX_DISCOVERY_RECORDS"] = 1
record = discovery_namespace["record_reference_discovery"]
record("scanner_errors", "")
record("scanner_errors", "")
self.assertEqual(
discovery_namespace["reference_discovery"]["scanner_errors"], [""]
)
self.assertTrue(discovery_namespace["reference_discovery"]["truncated"])
discovery_namespace["reference_discovery"] = {
"names": [],
"ignored": [],
"scanner_errors": [],
"truncated": False,
}
discovery_namespace["_discovery_chars"] = [0]
record("names", "x" * 4097)
self.assertEqual(discovery_namespace["reference_discovery"]["names"], [])
self.assertTrue(discovery_namespace["reference_discovery"]["truncated"])
def test_non_exact_name_is_not_represented_or_reformatted(self):
class Hostile(str):
def __repr__(self):
raise AssertionError("repr called")
def __str__(self):
raise AssertionError("str called")
discovery_namespace["record_reference_discovery"]("names", Hostile("x"))
self.assertEqual(discovery_namespace["reference_discovery"]["names"], [])
self.assertTrue(discovery_namespace["reference_discovery"]["truncated"])
names = {
"record_reference_issue",
"record_reference_expanded_class",
"ensure_reference_class_scope",
"record_reference_class_selection",
"reference_direct_names",
"check_reference_class_member",
"_expand_class_members",
"gen_methods",
}
nodes = [n for n in tree.body if isinstance(n, ast.FunctionDef) and n.name in names]
inventory_namespace = {
"_reference_type": type,
"_reference_str": str,
"_reference_len": len,
"_reference_set": set,
"_reference_sum": sum,
"_reference_any": any,
"_reference_chars_used": [0],
"_MAX_REFERENCE_FIELD_CHARS": 4096,
"_MAX_REFERENCE_TOTAL_CHARS": 32768,
"_MAX_REFERENCE_ISSUES": 1024,
"reference_inventory_diagnostics": {"issues": [], "truncated": False},
"reference_expanded_classes": {},
"reference_class_selection": {},
}
exec(
compile(ast.Module(nodes, type_ignores=[]), str(SOURCE), "exec"),
inventory_namespace,
)
class InventoryTests(unittest.TestCase):
def setUp(self):
self.original = inventory_namespace.copy()
inventory_namespace["reference_inventory_diagnostics"] = {
"issues": [],
"truncated": False,
}
inventory_namespace["_reference_chars_used"] = [0]
inventory_namespace["reference_expanded_classes"] = {}
inventory_namespace["reference_class_selection"] = {}
def tearDown(self):
inventory_namespace.clear()
inventory_namespace.update(self.original)
def test_direct_dotted_and_generated_collisions(self):
result = {"A.member": "direct"}
seen = inventory_namespace["reference_direct_names"](result, "demo")
check = inventory_namespace["check_reference_class_member"]
check(seen, "demo", "member", "A.member")
result["A.member"] = "first"
check(seen, "demo", "member", "A.member")
result["A.member"] = "second"
check(seen, "demo", "nested.member", "A.nested.member")
result["A.nested.member"] = "third"
self.assertEqual(result["A.member"], "second")
self.assertEqual(
inventory_namespace["reference_inventory_diagnostics"]["issues"],
[
("dotted_module_attribute", "demo", "A.member"),
("flattened_name_collision", "demo", "A.member"),
("flattened_name_collision", "demo", "A.member"),
("dotted_class_attribute", "demo", "A.nested.member"),
],
)
def test_different_class_paths_collide_after_flattening(self):
check = inventory_namespace["check_reference_class_member"]
seen = set()
check(seen, "demo", "B.C", "A.B.C")
check(seen, "demo", "C", "A.B.C")
self.assertEqual(
inventory_namespace["reference_inventory_diagnostics"]["issues"],
[
("dotted_class_attribute", "demo", "A.B.C"),
("flattened_name_collision", "demo", "A.B.C"),
],
)
def test_non_exact_formatted_key_is_not_hashed(self):
class Hostile(str):
def __hash__(self):
raise AssertionError("hash called")
def __repr__(self):
raise AssertionError("repr called")
inventory_namespace["check_reference_class_member"](
set(), "demo", "x", Hostile("C.x")
)
self.assertEqual(
inventory_namespace["reference_inventory_diagnostics"]["issues"],
[("non_exact_flattened_name", "demo", None)],
)
def test_non_exact_names_add_no_hash_equality_or_contains_callbacks(self):
calls = []
class Hostile(str):
def __hash__(self):
calls.append("hash")
return super().__hash__()
def __eq__(self, other):
calls.append("eq")
return super().__eq__(other)
def __contains__(self, other):
calls.append("contains")
return super().__contains__(other)
def __repr__(self):
raise AssertionError("repr called")
result = {Hostile("C.member"): 1}
calls.clear()
inventory_namespace["reference_direct_names"](result, "demo")
self.assertEqual(calls, [])
self.assertEqual(
inventory_namespace["reference_inventory_diagnostics"]["issues"],
[("non_exact_module_attribute", "demo", None)],
)
def test_existing_formatter_caller_and_count_are_preserved(self):
import sys
calls = []
class Hostile(str):
def __format__(self, spec):
caller = sys._getframe(1).f_code.co_name
calls.append(caller)
return caller
def __repr__(self):
raise AssertionError("repr called")
class DecimalType:
pass
module = types.SimpleNamespace(DecimalType=DecimalType)
result = {"DecimalType": {}}
inventory_namespace.update(
BUILTIN_TYPES=[], own_attrs=lambda obj: [(Hostile("x"), 1)]
)
inventory_namespace["_expand_class_members"](result, module)
self.assertEqual(calls, ["_expand_class_members"])
self.assertEqual(result["DecimalType._expand_class_members"], 1)
self.assertEqual(
inventory_namespace["reference_inventory_diagnostics"]["issues"],
[("non_exact_class_name_or_attribute", "decimal", None)],
)
def test_hostile_formatter_cannot_change_original_rhs_value(self):
import sys
class Hostile(str):
def __format__(self, spec):
sys._getframe(1).f_locals["info"] = "mutated"
return "x"
class DecimalType:
pass
module = types.SimpleNamespace(DecimalType=DecimalType)
result = {"DecimalType": {}}
inventory_namespace.update(
BUILTIN_TYPES=[], own_attrs=lambda obj: [(Hostile("x"), "original")]
)
inventory_namespace["_expand_class_members"](result, module)
self.assertEqual(result["DecimalType.x"], "original")
self.assertTrue(
inventory_namespace["reference_inventory_diagnostics"]["issues"]
)
def test_non_exact_scope_is_reported_without_repr(self):
class Hostile(str):
def __repr__(self):
raise AssertionError("repr called")
inventory_namespace["reference_direct_names"]({}, Hostile("demo"))
self.assertEqual(
inventory_namespace["reference_inventory_diagnostics"]["issues"],
[("non_exact_module_name", None, None)],
)
def test_oversized_diagnostics_are_truncated(self):
inventory_namespace["_MAX_REFERENCE_FIELD_CHARS"] = 2
inventory_namespace["record_reference_issue"]("large", "demo", "x")
self.assertEqual(
inventory_namespace["reference_inventory_diagnostics"],
{"issues": [], "truncated": True},
)
def test_total_text_budget_is_enforced(self):
inventory_namespace["_MAX_REFERENCE_TOTAL_CHARS"] = 4
record = inventory_namespace["record_reference_issue"]
record("one", "d", "xy")
record("two", "d", "xy")
self.assertEqual(
inventory_namespace["reference_inventory_diagnostics"],
{"issues": [("one", "d", "xy")], "truncated": True},
)
def test_decimal_expansion_accounts_for_direct_names(self):
class DecimalType:
pass
DecimalType.__name__ = "DecimalType"
module = types.SimpleNamespace(DecimalType=DecimalType)
result = {"DecimalType": {}, "DecimalType.x": "direct"}
inventory_namespace.update(
BUILTIN_TYPES=[], own_attrs=lambda obj: [("x", "member")]
)
inventory_namespace["_expand_class_members"](result, module)
self.assertEqual(result["DecimalType.x"], "member")
self.assertEqual(
inventory_namespace["reference_inventory_diagnostics"]["issues"],
[
("dotted_module_attribute", "decimal", "DecimalType.x"),
("flattened_name_collision", "decimal", "DecimalType.x"),
],
)
def test_reference_class_selection_covers_other_and_dotted_names(self):
class Empty:
pass
module = types.SimpleNamespace(Empty=Empty, plain=1)
result = {"Empty": {}, "plain": {}, "A.b": {}}
inventory_namespace.update(BUILTIN_TYPES=[], own_attrs=lambda obj: [])
inventory_namespace["_expand_class_members"](result, module)
self.assertEqual(
inventory_namespace["reference_class_selection"],
{
"decimal": {
"Empty": "selected",
"plain": "not_selected",
"A.b": "skipped_dotted",
}
},
)
def test_zero_member_expanded_class_is_recorded(self):
class Empty:
pass
module = types.SimpleNamespace(Empty=Empty)
result = {"Empty": {}}
inventory_namespace.update(BUILTIN_TYPES=[], own_attrs=lambda obj: [])
inventory_namespace["_expand_class_members"](result, module)
self.assertEqual(
inventory_namespace["reference_expanded_classes"], {"decimal": ["Empty"]}
)
self.assertEqual(
inventory_namespace["reference_class_selection"],
{"decimal": {"Empty": "selected"}},
)
def test_duplicate_builtin_names(self):
inventory_namespace.update(
BUILTIN_TYPES=[],
eval=lambda code: list,
extra_info=lambda obj: {},
own_attrs=lambda obj: [],
name_sort_key=lambda name: name,
)
inventory_namespace["gen_methods"]()
self.assertTrue(
any(
item[0] == "duplicate_builtin_type"
for item in inventory_namespace["reference_inventory_diagnostics"][
"issues"
]
)
)
def test_dotted_builtin_type_is_ambiguous(self):
unusual = type("A.B", (), {})
inventory_namespace.update(
BUILTIN_TYPES=[],
eval=lambda code: unusual,
extra_info=lambda obj: {},
own_attrs=lambda obj: [],
name_sort_key=lambda name: name,
)
inventory_namespace["gen_methods"]()
self.assertIn(
("dotted_builtin_type", "builtins", "A.B"),
inventory_namespace["reference_inventory_diagnostics"]["issues"],
)
def test_non_native_builtin_type_keeps_original_rhs_order(self):
import sys
events = []
class FakeType:
@property
def __name__(self):
events.append("name")
sys._getframe(1).f_locals["info"] = "mutated"
return "Repeated"
typ = FakeType()
inventory_namespace.update(
BUILTIN_TYPES=[],
eval=lambda code: typ,
extra_info=lambda obj: events.append("info") or {"original": True},
own_attrs=lambda obj: events.append("attrs") or [],
name_sort_key=lambda name: name,
)
output = inventory_namespace["gen_methods"]()
self.assertEqual(events, ["info", "attrs", "name"] * (len(events) // 3))
self.assertIn("'original': True", output)
self.assertNotIn("mutated", output)
self.assertTrue(
any(
item[0] == "non_native_builtin_type"
for item in inventory_namespace["reference_inventory_diagnostics"][
"issues"
]
)
)
def test_rhs_callback_can_replace_type_without_changing_assignment_order(self):
import sys
class Hostile:
@property
def __name__(self):
sys._getframe(1).f_locals["info"] = "mutated"
return "Replacement"
replacement = Hostile()
def inspect_type(obj):
sys._getframe(1).f_locals["typ"] = replacement
return {"original": True}
inventory_namespace.update(
BUILTIN_TYPES=[],
eval=lambda code: list,
extra_info=inspect_type,
own_attrs=lambda obj: [],
name_sort_key=lambda name: name,
)
output = inventory_namespace["gen_methods"]()
self.assertIn("'original': True", output)
self.assertNotIn("mutated", output)
self.assertTrue(
any(
item[0] == "non_native_builtin_type"
for item in inventory_namespace["reference_inventory_diagnostics"][
"issues"
]
)
)
def test_diagnostics_are_bounded_and_truncation_explicit(self):
inventory_namespace["_MAX_REFERENCE_ISSUES"] = 1
record = inventory_namespace["record_reference_issue"]
record("one", "demo", "x")
record("two", "demo", "y")
self.assertEqual(
inventory_namespace["reference_inventory_diagnostics"],
{"issues": [("one", "demo", "x")], "truncated": True},
)
names = {
"attr_is_not_inherited",
"compare",
"observe_real_type",
"observe_real_exception",
"dir_of_mod_or_error",
"name_sort_key",
}
nodes = [n for n in tree.body if isinstance(n, ast.FunctionDef) and n.name in names]
coverage_namespace = {
"cpython_failed_imports": {},
"reference_discovery": {},
"inspect": inspect,
"re": re,
"sys": sys,
"reference_inventory_diagnostics": {"issues": [], "truncated": False},
"reference_expanded_classes": {},
"reference_class_selection": {},
"actual_parent_scans": {},
"_safe_type": type,
"_safe_str": str,
"_safe_frozenset": frozenset,
}
exec(
compile(ast.Module(nodes, type_ignores=[]), str(SOURCE), "exec"), coverage_namespace
)
for name in ("extra_info",):
node = next(
n for n in tree.body if isinstance(n, ast.FunctionDef) and n.name == name
)
exec(
compile(ast.Module([node], type_ignores=[]), str(SOURCE), "exec"),
coverage_namespace,
)
class CoverageTests(unittest.TestCase):
def setUp(self):
original = coverage_namespace.copy()
coverage_namespace["actual_parent_scans"] = {}
coverage_namespace["reference_expanded_classes"] = {}
def restore():
coverage_namespace.clear()
coverage_namespace.update(original)
self.addCleanup(restore)
def test_real_type_observation_ignores_spoofed_class(self):
calls = []
class PretendsToBeType:
@property
def __class__(self):
calls.append("class")
return type
obj = PretendsToBeType()
self.assertTrue(isinstance(obj, type))
calls.clear()
self.assertEqual(coverage_namespace["observe_real_type"](obj), "not_real_type")
self.assertEqual(calls, [])
self.assertEqual(coverage_namespace["observe_real_type"](list), "real_type")
def test_direct_scan_records_selected_parents_without_extra_getters(self):
calls = []
class Pretend:
@property
def __class__(self):
calls.append("spoofed_class")
return type
class Item:
pass
bad = object()
values = {"Type": Item, "Pretend": Pretend(), "Failure": bad}
class Module:
def __dir__(self):
return list(values)
def __getattribute__(self, name):
if name in values:
calls.append(name)
return values[name]
return super().__getattribute__(name)
observe = coverage_namespace["observe_real_type"]
coverage_namespace.update(
import_module=lambda name: Module(),
extra_info=lambda obj: {"sig": None, "sig_error": False, "doc": None},
observe_real_type=lambda obj: (
"classification_failed" if obj is bad else observe(obj)
),
reference_expanded_classes={
"demo": ["Type", "Pretend", "Failure", "Missing"]
},
)
coverage_namespace["dir_of_mod_or_error"]("demo")
self.assertEqual(calls, ["Failure", "Pretend", "Type"])
self.assertEqual(
coverage_namespace["actual_parent_scans"],
{
"demo": {
"Failure": "classification_failed",
"Pretend": "not_real_type",
"Type": "real_type",
}
},
)
def test_module_scan_and_second_import_outcomes_are_distinct(self):
ref = {
"sig": "(self, /)",
"sig_error": False,
"doc": "same",
}
with tempfile.TemporaryDirectory() as tmp:
pathlib.Path(tmp, "failed.py").touch()
pathlib.Path(tmp, "demo.py").touch()
coverage_namespace.update(
expected_methods={},
cpymods={
"absent": {},
"failed": {},
"demo": {"Thing": ref, "Thing.member": ref},
},
libdir=os.fsencode(tmp),
reference_expanded_classes={
"absent": ["Empty"],
"failed": ["Empty"],
"demo": ["Thing"],
},
dir_of_mod_or_error=lambda name: (
RuntimeError("failed") if name == "failed" else {"Thing": ref}
),
import_module=lambda name: RuntimeError("second import failed"),
)
output = io.StringIO()
with redirect_stdout(output):
coverage_namespace["compare"]()
result = json.loads(output.getvalue())
self.assertEqual(
result["actual_scan_status"],
{
"absent": "not_discovered",
"failed": "scan_returned_exception",
"demo": "scan_completed",
},
)
self.assertEqual(
result["actual_second_import_status"],
{
"absent": "not_attempted",
"failed": "not_attempted",
"demo": "returned_exception",
},
)
self.assertEqual(
result["actual_parent_decisions"]["demo"],
{"Thing.member": "isinstance_false"},
)
self.assertEqual(
result["actual_parent_scans"]["absent"], {"Empty": "not_observed"}
)
def test_module_inherited_and_missing_observations(self):
class Parent:
def same(self):
pass
def other(self):
pass
class Child(Parent):
pass
module = types.ModuleType("demo")
module.Thing = Child
ref = {
"sig": "(self, /)",
"sig_error": False,
"doc": "same",
}
actual = {
**ref,
}
incompatible = {**actual, "sig": "(self, required, /)"}
def inspect_item(obj):
return incompatible if obj is Parent.other else actual
with tempfile.TemporaryDirectory() as tmp:
pathlib.Path(tmp, "demo.py").touch()
coverage_namespace.update(
{
"expected_methods": {},
"reference_expanded_classes": {"demo": ["Thing", "Empty"]},
"actual_parent_scans": {"demo": {"Thing": "real_type"}},
"cpymods": {
"demo": {
"Thing": ref,
"Thing.same": ref,
"Thing.other": ref,
"Thing.missing": ref,
}
},
"libdir": os.fsencode(tmp),
"extra_info": inspect_item,
"dir_of_mod_or_error": lambda name: (
{"Thing": actual} if name == "demo" else {}
),
"import_module": lambda name: module,
}
)
output = io.StringIO()
with redirect_stdout(output):
coverage_namespace["compare"]()
result = json.loads(output.getvalue())
self.assertIn("demo.Thing.other (inherited)", result["missing_items"]["demo"])
self.assertIn("demo.Thing.missing", result["missing_items"]["demo"])
self.assertNotIn("demo.Thing.same", result["missing_items"]["demo"])
self.assertEqual(result["actual_scan_status"]["demo"], "scan_completed")
self.assertEqual(
result["actual_second_import_status"]["demo"], "returned_nonexception"
)
self.assertEqual(
result["actual_parent_scans"]["demo"],
{"Thing": "real_type", "Empty": "not_observed"},
)
self.assertEqual(
result["actual_parent_decisions"]["demo"],
{
"Thing.same": "isinstance_true",
"Thing.other": "isinstance_true",
"Thing.missing": "isinstance_true",
},
)
class ReferenceErrorTests(unittest.TestCase):
def setUp(self):
global reference_error_namespace
reference_error_namespace = coverage_namespace
original = coverage_namespace.copy()
reference_error_namespace["actual_parent_scans"] = {}
reference_error_namespace["reference_expanded_classes"] = {}
def restore():
coverage_namespace.clear()
coverage_namespace.update(original)
self.addCleanup(restore)
def run_comparison(self, *, module_error):
builtin = {"sig": "ValueError('builtin')", "sig_error": True, "doc": None}
reference = {
"sig": "ValueError('module')" if module_error else "(x, /)",
"sig_error": module_error,
"doc": "same",
}
actual = {"sig": "(x, /)", "sig_error": False, "doc": "same"}
with tempfile.TemporaryDirectory() as tmp:
pathlib.Path(tmp, "demo.py").touch()
reference_error_namespace.update(
expected_methods={"demo": (type, builtin, [])},
cpymods={"demo": {"f": reference}},
libdir=os.fsencode(tmp),
dir_of_mod_or_error=lambda name: {"f": actual},
import_module=lambda name: types.ModuleType(name),
)
output = io.StringIO()
with redirect_stdout(output):
reference_error_namespace["compare"]()
return json.loads(output.getvalue())
def test_builtin_name_collision_does_not_hide_clean_module(self):
result = self.run_comparison(module_error=False)
self.assertIn("demo", result["implemented"])
self.assertEqual(
result["uncomparable_signatures"]["demo"],
[["demo", "ValueError('builtin')"]],
)
def test_module_reference_error_still_prevents_clean_classification(self):
result = self.run_comparison(module_error=True)
self.assertNotIn("demo", result["implemented"])
self.assertIn(
["demo.f", "ValueError('module')"],
result["uncomparable_signatures"]["demo"],
)
if __name__ == "__main__":
unittest.main()