Fix mypy errors for pandas\tests\*
For a full list, expand details.

<details>

```
pandas\tests\tseries\offsets\test_offsets_properties.py:54: error: Argument "min_value" to "datetimes" has incompatible type "Tuple[Any]"; expected "datetime"
pandas\tests\tseries\offsets\test_offsets_properties.py:54: error: Argument "max_value" to "datetimes" has incompatible type "Tuple[Any]"; expected "datetime"
pandas\tests\io\parser\conftest.py:11: error: Need type annotation for 'float_precision_choices' (hint: "float_precision_choices: List[<type>] = ...")
pandas\tests\io\parser\conftest.py:29: error: Incompatible types in assignment (expression has type "str", base class "BaseParser" defined the type as "None")
pandas\tests\io\parser\conftest.py:42: error: Incompatible types in assignment (expression has type "str", base class "BaseParser" defined the type as "None")
pandas\tests\io\parser\conftest.py:62: error: Unsupported operand types for + ("List[CParser]" and "List[PythonParser]")
pandas\tests\extension\json\array.py:30: error: Need type annotation for 'na_value'
pandas\conftest.py:11: error: Module 'pytz' has no attribute 'FixedOffset'
pandas\conftest.py:486: error: Unsupported operand types for + ("List[str]" and "List[object]")
pandas\conftest.py:500: error: Unsupported operand types for + ("List[object]" and "List[str]")
pandas\conftest.py:505: error: Unsupported operand types for + ("List[object]" and "List[str]")
pandas\conftest.py:506: error: Unsupported operand types for + ("List[object]" and "List[str]")
pandas\tests\test_base.py:1312: error: Argument "freq" to "period_array" has incompatible type "str"; expected "Optional[Tick]"
pandas\tests\test_base.py:1354: error: Argument "freq" to "period_array" has incompatible type "str"; expected "Optional[Tick]"
pandas\tests\test_algos.py:770: error: Invalid signature "def (self: Any) -> Any"
pandas\tests\tseries\offsets\test_offsets.py:662: error: Incompatible types in assignment (expression has type "Type[BusinessDay]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:757: error: Argument 1 to "append" of "list" has incompatible type "Tuple[int, Dict[datetime, datetime]]"; expected "Tuple[BusinessDay, Dict[datetime, datetime]]"
pandas\tests\tseries\offsets\test_offsets.py:784: error: Argument 1 to "append" of "list" has incompatible type "Tuple[int, Dict[datetime, datetime]]"; expected "Tuple[BusinessDay, Dict[datetime, datetime]]"
pandas\tests\tseries\offsets\test_offsets.py:849: error: Incompatible types in assignment (expression has type "Type[BusinessHour]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:2255: error: Incompatible types in assignment (expression has type "Type[CustomBusinessHour]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:2547: error: Incompatible types in assignment (expression has type "Type[CustomBusinessDay]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:2645: error: Argument 1 to "append" of "list" has incompatible type "Tuple[int, Dict[datetime, datetime]]"; expected "Tuple[CustomBusinessDay, Dict[datetime, datetime]]"
pandas\tests\tseries\offsets\test_offsets.py:2672: error: Argument 1 to "append" of "list" has incompatible type "Tuple[int, Dict[datetime, datetime]]"; expected "Tuple[CustomBusinessDay, Dict[datetime, datetime]]"
pandas\tests\tseries\offsets\test_offsets.py:2826: error: Incompatible types in assignment (expression has type "Type[CustomBusinessMonthEnd]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:2889: error: Argument 1 to "append" of "list" has incompatible type "Tuple[int, Dict[datetime, datetime]]"; expected "Tuple[CustomBusinessMonthEnd, Dict[datetime, datetime]]"
pandas\tests\tseries\offsets\test_offsets.py:2909: error: Argument 1 to "append" of "list" has incompatible type "Tuple[int, Dict[datetime, datetime]]"; expected "Tuple[CustomBusinessMonthEnd, Dict[datetime, datetime]]"
pandas\tests\tseries\offsets\test_offsets.py:2975: error: Incompatible types in assignment (expression has type "Type[CustomBusinessMonthBegin]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:3038: error: Argument 1 to "append" of "list" has incompatible type "Tuple[int, Dict[datetime, datetime]]"; expected "Tuple[CustomBusinessMonthBegin, Dict[datetime, datetime]]"
pandas\tests\tseries\offsets\test_offsets.py:3058: error: Argument 1 to "append" of "list" has incompatible type "Tuple[int, Dict[datetime, datetime]]"; expected "Tuple[CustomBusinessMonthBegin, Dict[datetime, datetime]]"
pandas\tests\tseries\offsets\test_offsets.py:3123: error: Incompatible types in assignment (expression has type "Type[Week]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:3125: error: Cannot determine type of '_offset'
pandas\tests\tseries\offsets\test_offsets.py:3126: error: Cannot determine type of '_offset'
pandas\tests\tseries\offsets\test_offsets.py:3222: error: Incompatible types in assignment (expression has type "Type[WeekOfMonth]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:3223: error: Cannot determine type of '_offset'
pandas\tests\tseries\offsets\test_offsets.py:3224: error: Cannot determine type of '_offset'
pandas\tests\tseries\offsets\test_offsets.py:3322: error: Incompatible types in assignment (expression has type "Type[LastWeekOfMonth]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:3323: error: Cannot determine type of '_offset'
pandas\tests\tseries\offsets\test_offsets.py:3324: error: Cannot determine type of '_offset'
pandas\tests\tseries\offsets\test_offsets.py:3399: error: Incompatible types in assignment (expression has type "Type[SemiMonthEnd]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:3400: error: Cannot determine type of '_offset'
pandas\tests\tseries\offsets\test_offsets.py:3401: error: Cannot determine type of '_offset'
pandas\tests\tseries\offsets\test_offsets.py:3658: error: Incompatible types in assignment (expression has type "Type[SemiMonthBegin]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_offsets.py:3659: error: Cannot determine type of '_offset'
pandas\tests\tseries\offsets\test_offsets.py:3660: error: Cannot determine type of '_offset'
pandas\tests\series\test_constructors.py:48: error: Need type annotation for 'x'
pandas\tests\series\test_constructors.py:53: error: Need type annotation for 'x'
pandas\tests\plotting\test_backend.py:12: error: Module has no attribute "plot"
pandas\tests\io\test_sql.py:964: error: Incompatible types in assignment (expression has type "str", base class "_TestSQLApi" defined the type as "None")
pandas\tests\io\test_sql.py:1156: error: Incompatible types in assignment (expression has type "str", base class "_TestSQLApi" defined the type as "None")
pandas\tests\io\test_sql.py:2075: error: Definition of "flavor" in base class "_TestMySQLAlchemy" is incompatible with definition in base class "_TestSQLAlchemy"
pandas\tests\io\test_sql.py:2081: error: Definition of "flavor" in base class "_TestMySQLAlchemy" is incompatible with definition in base class "_TestSQLAlchemy"
pandas\tests\io\test_sql.py:2087: error: Definition of "flavor" in base class "_TestPostgreSQLAlchemy" is incompatible with definition in base class "_TestSQLAlchemy"
pandas\tests\io\test_sql.py:2093: error: Definition of "flavor" in base class "_TestPostgreSQLAlchemy" is incompatible with definition in base class "_TestSQLAlchemy"
pandas\tests\io\test_sql.py:2098: error: Definition of "flavor" in base class "_TestSQLiteAlchemy" is incompatible with definition in base class "_TestSQLAlchemy"
pandas\tests\io\test_sql.py:2103: error: Definition of "flavor" in base class "_TestSQLiteAlchemy" is incompatible with definition in base class "_TestSQLAlchemy"
pandas\tests\io\json\test_ujson.py:4: error: Name 'json' already defined (by an import)
pandas\tests\indexing\test_coercion.py:933: error: List item 0 has incompatible type "int"; expected "str"
pandas\tests\indexing\test_coercion.py:933: error: List item 1 has incompatible type "int"; expected "str"
pandas\tests\indexing\test_coercion.py:934: error: List item 0 has incompatible type "float"; expected "str"
pandas\tests\indexing\test_coercion.py:934: error: List item 1 has incompatible type "float"; expected "str"
pandas\tests\indexing\test_coercion.py:935: error: List item 0 has incompatible type "complex"; expected "str"
pandas\tests\indexing\test_coercion.py:935: error: List item 1 has incompatible type "complex"; expected "str"
pandas\tests\indexing\test_coercion.py:936: error: List item 0 has incompatible type "bool"; expected "str"
pandas\tests\indexing\test_coercion.py:936: error: List item 1 has incompatible type "bool"; expected "str"
pandas\tests\indexes\interval\test_interval_tree.py:157: error: Argument 1 to "map" has incompatible type "Type[List[Any]]"; expected "Callable[[Tuple[int, ...]], List[_T]]"
pandas\tests\indexes\interval\test_interval_tree.py:164: error: Argument 1 to "map" has incompatible type "Type[List[Any]]"; expected "Callable[[Tuple[int, ...]], List[_T]]"
pandas\tests\frame\test_constructors.py:53: error: Need type annotation for 'x'
pandas\tests\frame\test_constructors.py:59: error: Need type annotation for 'x'
pandas\tests\frame\test_constructors.py:75: error: Need type annotation for 'x'
pandas\tests\dtypes\test_inference.py:78: error: Need type annotation for 'x'
pandas\tests\dtypes\test_inference.py:291: error: Too many arguments for "tuple"
pandas\tests\dtypes\test_inference.py:291: error: Argument 1 to "tuple" has incompatible type "int"; expected "Iterable[Any]"
pandas\tests\computation\test_eval.py:1883: error: Dict entry 1 has incompatible type "str": "Type[ExprVisitor]"; expected "str": "Type[BaseExprVisitor]"
pandas\tests\arrays\test_period.py:245: error: Argument "freq" to "period_array" has incompatible type "str"; expected "Optional[Tick]"
pandas\tests\arrays\test_datetimelike.py:225: error: Incompatible types in assignment (expression has type "Type[DatetimeIndex]", base class "SharedTests" defined the type as "None")
pandas\tests\arrays\test_datetimelike.py:476: error: Incompatible types in assignment (expression has type "Type[TimedeltaIndex]", base class "SharedTests" defined the type as "None")
pandas\tests\arrays\test_datetimelike.py:586: error: Incompatible types in assignment (expression has type "Type[PeriodIndex]", base class "SharedTests" defined the type as "None")
pandas\tests\arithmetic\test_datetime64.py:2164: error: "DatetimeIndex" has no attribute "tz_localize"
pandas\tests\tseries\offsets\test_yqm_offsets.py:545: error: Incompatible types in assignment (expression has type "Type[QuarterEnd]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_yqm_offsets.py:692: error: Incompatible types in assignment (expression has type "Type[BQuarterBegin]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_yqm_offsets.py:817: error: Incompatible types in assignment (expression has type "Type[BQuarterEnd]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_yqm_offsets.py:964: error: Incompatible types in assignment (expression has type "Type[YearBegin]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_yqm_offsets.py:1118: error: Incompatible types in assignment (expression has type "Type[YearEnd]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_yqm_offsets.py:1267: error: Incompatible types in assignment (expression has type "Type[BYearBegin]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_yqm_offsets.py:1340: error: Incompatible types in assignment (expression has type "Type[BYearEnd]", base class "Base" defined the type as "None")
pandas\tests\tseries\offsets\test_yqm_offsets.py:1413: error: Incompatible types in assignment (expression has type "Type[BYearEnd]", base class "Base" defined the type as "None")
pandas\tests\series\test_operators.py:787: error: "Type[Series]" has no attribute "div"
pandas\tests\series\test_operators.py:787: error: "Type[Series]" has no attribute "rdiv"
pandas\tests\indexing\test_loc.py:819: error: No overload variant of "slice" matches argument types "None", "str", "None"
pandas\tests\indexing\test_loc.py:819: note: Possible overload variant:
pandas\tests\indexing\test_loc.py:819: note:     def __init__(self, start: Optional[int], stop: Optional[int], step: Optional[int] = ...) -> slice
pandas\tests\indexing\test_loc.py:819: note:     <1 more non-matching overload not shown>
pandas\tests\indexes\test_numeric.py:99: error: Incompatible types in assignment (expression has type "Type[Float64Index]", base class "Base" defined the type as "None")
pandas\tests\indexes\test_numeric.py:605: error: Incompatible types in assignment (expression has type "Type[Int64Index]", base class "Base" defined the type as "None")
pandas\tests\indexes\test_numeric.py:889: error: Incompatible types in assignment (expression has type "Type[UInt64Index]", base class "Base" defined the type as "None")
pandas\tests\indexes\test_category.py:20: error: Incompatible types in assignment (expression has type "Type[CategoricalIndex]", base class "Base" defined the type as "None")
pandas\tests\indexes\test_base.py:49: error: Incompatible types in assignment (expression has type "Type[Index]", base class "Base" defined the type as "None")
pandas\tests\indexes\test_base.py:526: error: Need type annotation for 'x'
pandas\tests\indexes\test_base.py:549: error: Need type annotation for 'x'
pandas\tests\indexes\test_base.py:1743: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1744: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1745: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1746: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1747: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1748: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1750: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1751: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1752: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1753: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1754: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1755: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1756: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1757: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:1758: error: Slice index must be an integer or None
pandas\tests\indexes\test_base.py:2438: error: Incompatible types in assignment (expression has type "Type[Index]", base class "Base" defined the type as "None")
pandas\tests\indexes\interval\test_base.py:15: error: Incompatible types in assignment (expression has type "Type[IntervalIndex]", base class "Base" defined the type as "None")
pandas\tests\frame\test_convert_to.py:579: error: Argument 1 to "defaultdict" has incompatible type "Type[List[Any]]"; expected "Optional[Callable[[], Dict[str, float]]]"
pandas\tests\dtypes\test_common.py:327: error: Unsupported operand types for + ("List[Series]" and "List[str]")
pandas\tests\dtypes\test_common.py:355: error: Unsupported operand types for + ("List[Series]" and "List[object]")
pandas\tests\dtypes\test_common.py:387: error: Unsupported operand types for + ("List[Series]" and "List[str]")
pandas\tests\api\test_api.py:44: error: Need type annotation for 'deprecated_modules' (hint: "deprecated_modules: List[<type>] = ...")
pandas\tests\api\test_api.py:95: error: Need type annotation for 'deprecated_classes' (hint: "deprecated_classes: List[<type>] = ...")
pandas\tests\api\test_api.py:98: error: Need type annotation for 'deprecated_classes_in_future' (hint: "deprecated_classes_in_future: List[<type>] = ...")
pandas\tests\api\test_api.py:174: error: Need type annotation for 'deprecated_funcs_in_future' (hint: "deprecated_funcs_in_future: List[<type>] = ...")
pandas\tests\api\test_api.py:177: error: Need type annotation for 'deprecated_funcs' (hint: "deprecated_funcs: List[<type>] = ...")
pandas\tests\indexes\test_range.py:22: error: Incompatible types in assignment (expression has type "Type[RangeIndex]", base class "Base" defined the type as "None")
pandas\tests\indexes\timedeltas\test_timedelta.py:31: error: Incompatible types in assignment (expression has type "Type[TimedeltaIndex]", base class "Base" defined the type as "None")
pandas\tests\indexes\period\test_period.py:26: error: Incompatible types in assignment (expression has type "Type[PeriodIndex]", base class "Base" defined the type as "None")
pandas\tests\indexes\datetimes\test_datetimelike.py:10: error: Incompatible types in assignment (expression has type "Type[DatetimeIndex]", base class "Base" defined the type as "None")
pandas\tests\arrays\test_array.py:36: error: Argument "freq" to "period_array" has incompatible type "str"; expected "Optional[Tick]"
pandas\tests\arrays\test_array.py:42: error: Argument "freq" to "period_array" has incompatible type "str"; expected "Optional[Tick]"
pandas\tests\arrays\test_array.py:128: error: Argument "freq" to "period_array" has incompatible type "str"; expected "Optional[Tick]"
pandas\tests\arrays\test_array.py:163: error: Argument "freq" to "period_array" has incompatible type "str"; expected "Optional[Tick]"
pandas\tests\extension\test_sparse.py:311: error: Incompatible types in assignment (expression has type "None", base class "BaseArithmeticOpsTests" defined the type as "Type[TypeError]")
pandas\tests\extension\test_sparse.py:312: error: Incompatible types in assignment (expression has type "None", base class "BaseArithmeticOpsTests" defined the type as "Type[TypeError]")
pandas\tests\extension\test_sparse.py:313: error: Incompatible types in assignment (expression has type "None", base class "BaseArithmeticOpsTests" defined the type as "Type[TypeError]")
pandas\tests\extension\test_sparse.py:314: error: Incompatible types in assignment (expression has type "None", base class "BaseArithmeticOpsTests" defined the type as "Type[TypeError]")
pandas\tests\extension\test_numpy.py:252: error: Incompatible types in assignment (expression has type "None", base class "BaseArithmeticOpsTests" defined the type as "Type[TypeError]")
pandas\tests\extension\test_numpy.py:253: error: Incompatible types in assignment (expression has type "None", base class "BaseArithmeticOpsTests" defined the type as "Type[TypeError]")
pandas\tests\extension\test_numpy.py:254: error: Incompatible types in assignment (expression has type "None", base class "BaseArithmeticOpsTests" defined the type as "Type[TypeError]")
pandas\tests\extension\test_numpy.py:255: error: Incompatible types in assignment (expression has type "None", base class "BaseArithmeticOpsTests" defined the type as "Type[TypeError]")
pandas\tests\extension\json\test_json.py:118: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:118: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:122: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:122: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:145: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:145: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:152: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:152: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:168: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:168: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:172: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:172: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:192: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:192: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:248: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:248: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:261: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:261: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:289: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:289: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:307: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:307: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:311: error: Definition of "assert_series_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\json\test_json.py:311: error: Definition of "assert_frame_equal" in base class "BaseJSON" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:113: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:113: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:118: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:118: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:122: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:122: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:129: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:129: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:133: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:133: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:141: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:141: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:166: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:166: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:182: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:182: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:186: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:186: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:194: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:194: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:198: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:198: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:267: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:267: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:301: error: Definition of "assert_series_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
pandas\tests\extension\decimal\test_decimal.py:301: error: Definition of "assert_frame_equal" in base class "BaseDecimal" is incompatible with definition in base class "BaseExtensionTests"
(pandas-dev) 
```

</details>

This breaks down to the following number of errors in relevant modules:


- [x]      29 pandas\tests\tseries\offsets\test_offsets.py #29340
- [x]      26 pandas\tests\extension\decimal\test_decimal.py #31730
- [x]      24 pandas\tests\extension\json\test_json.py #31836
- [x]      19 pandas\tests\indexes\test_base.py #29188
- [x]       8 pandas\tests\tseries\offsets\test_yqm_offsets.py #28996
- [x]       8 pandas\tests\io\test_sql.py #29006
- [x]       8 pandas\tests\indexing\test_coercion.py #28990
- [x]       5 pandas\tests\api\test_api.py #28935
- [ ]       5 pandas\conftest.py #29046
- [x]       4 pandas\tests\io\parser\conftest.py #28973
- [x]       4 pandas\tests\extension\test_sparse.py #28947
- [x]       4 pandas\tests\extension\test_numpy.py #28947
- [x]       4 pandas\tests\arrays\test_array.py #28970
- [x]       3 pandas\tests\indexes\test_numeric.py #28961
- [x]       3 pandas\tests\frame\test_constructors.py #29115
- [x]       3 pandas\tests\dtypes\test_inference.py #29114
- [x]       3 pandas\tests\dtypes\test_common.py #29179
- [x]       3 pandas\tests\arrays\test_datetimelike.py #29014
- [x]       2 pandas\tests\tseries\offsets\test_offsets_properties.py #28972
- [x]       2 pandas\tests\test_base.py #28970
- [x]       2 pandas\tests\series\test_operators.py #29826
- [x]       2 pandas\tests\series\test_constructors.py #29108
- [x]       2 pandas\tests\indexes\interval\test_interval_tree.py #29021
- [x]       1 pandas\tests\test_algos.py #28960
- [x]       1 pandas\tests\plotting\test_backend.py #29016
- [x]       1 pandas\tests\io\json\test_ujson.py #29022
- [x]       ~~1 pandas\tests\indexing\test_loc.py~~
- [x]       1 pandas\tests\indexes\timedeltas\test_timedelta.py #28961
- [x]       1 pandas\tests\indexes\test_range.py #28961
- [x]       1 pandas\tests\indexes\test_category.py #28961
- [x]       1 pandas\tests\indexes\period\test_period.py #28961
- [x]       1 pandas\tests\indexes\interval\test_base.py #28961
- [x]       1 pandas\tests\indexes\datetimes\test_datetimelike.py #28961
- [x]       1 pandas\tests\frame\test_convert_to.py #28965
- [x]       1 pandas\tests\extension\json\array.py #31718
- [x]       1 pandas\tests\computation\test_eval.py #29007
- [x]       1 pandas\tests\arrays\test_period.py #28970
- [ ]       1 pandas\tests\arithmetic\test_datetime64.py #31716

assume that the degree of difficulty to resolve will vary, but some should be good first issues.

PRs to tackle individual modules preferred and remove from whitelist in setup.cfg.