diff --git a/.github/ruff.toml b/.github/ruff.toml
index ea923692..c6a66b08 100644
--- a/.github/ruff.toml
+++ b/.github/ruff.toml
@@ -43,5 +43,11 @@ exclude = [
 ]
 
 [per-file-ignores]
-#"__init__.py" = ["E402"]
-#"path/to/file.py" = ["E402"]
+# until we address #1592 and move test fixtures into conftest.py
+# then we need to ignore imports done to enable pytest fixtures.
+#
+# F401: `foo` imported but unused
+# F811 Redefinition of unused `foo`
+"tests/test_main.py" = ["F401", "F811"]
+"tests/test_freeze.py" = ["F401", "F811"]
+"tests/test_function_id.py" = ["F401", "F811"]
diff --git a/capa/engine.py b/capa/engine.py
index 4d9e0980..90a3308f 100644
--- a/capa/engine.py
+++ b/capa/engine.py
@@ -8,7 +8,7 @@
 
 import copy
 import collections
-from typing import TYPE_CHECKING, Set, Dict, List, Tuple, Union, Mapping, Iterable, Iterator, cast
+from typing import TYPE_CHECKING, Set, Dict, List, Tuple, Union, Mapping, Iterable, Iterator
 
 import capa.perf
 import capa.features.common
diff --git a/capa/features/extractors/binja/basicblock.py b/capa/features/extractors/binja/basicblock.py
index e354669d..6649fc92 100644
--- a/capa/features/extractors/binja/basicblock.py
+++ b/capa/features/extractors/binja/basicblock.py
@@ -15,7 +15,6 @@ from binaryninja import Function, Settings
 from binaryninja import BasicBlock as BinjaBasicBlock
 from binaryninja import (
     BinaryView,
-    DataBuffer,
     SymbolType,
     RegisterValueType,
     VariableSourceType,
@@ -26,7 +25,7 @@ from binaryninja import (
 )
 
 from capa.features.common import Feature, Characteristic
-from capa.features.address import Address, AbsoluteVirtualAddress
+from capa.features.address import Address
 from capa.features.basicblock import BasicBlock
 from capa.features.extractors.helpers import MIN_STACKSTRING_LEN
 from capa.features.extractors.base_extractor import BBHandle, FunctionHandle
diff --git a/capa/features/extractors/binja/file.py b/capa/features/extractors/binja/file.py
index 9700a8c1..edc11ed4 100644
--- a/capa/features/extractors/binja/file.py
+++ b/capa/features/extractors/binja/file.py
@@ -10,7 +10,7 @@ import sys
 import struct
 from typing import Tuple, Iterator
 
-from binaryninja import Symbol, Segment, BinaryView, SymbolType, SymbolBinding
+from binaryninja import Segment, BinaryView, SymbolType, SymbolBinding
 
 import capa.features.extractors.common
 import capa.features.extractors.helpers
diff --git a/capa/features/extractors/binja/function.py b/capa/features/extractors/binja/function.py
index 96c58eea..981650b7 100644
--- a/capa/features/extractors/binja/function.py
+++ b/capa/features/extractors/binja/function.py
@@ -19,7 +19,6 @@ from capa.features.extractors.base_extractor import FunctionHandle
 def extract_function_calls_to(fh: FunctionHandle):
     """extract callers to a function"""
     func: Function = fh.inner
-    bv: BinaryView = func.view
 
     for caller in func.caller_sites:
         # Everything that is a code reference to the current function is considered a caller, which actually includes
diff --git a/capa/features/extractors/binja/global_.py b/capa/features/extractors/binja/global_.py
index f8ce7003..afcec4ad 100644
--- a/capa/features/extractors/binja/global_.py
+++ b/capa/features/extractors/binja/global_.py
@@ -1,10 +1,8 @@
 import logging
-import contextlib
 from typing import Tuple, Iterator
 
 from binaryninja import BinaryView
 
-import capa.features.extractors.elf
 from capa.features.common import OS, OS_MACOS, ARCH_I386, ARCH_AMD64, OS_WINDOWS, Arch, Feature
 from capa.features.address import NO_ADDRESS, Address
 
diff --git a/capa/features/extractors/binja/insn.py b/capa/features/extractors/binja/insn.py
index fe5cd228..9f22beae 100644
--- a/capa/features/extractors/binja/insn.py
+++ b/capa/features/extractors/binja/insn.py
@@ -6,7 +6,7 @@
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
 import sys
-from typing import Any, Dict, List, Tuple, Iterator, Optional
+from typing import Any, List, Tuple, Iterator, Optional
 
 from binaryninja import Function
 from binaryninja import BasicBlock as BinjaBasicBlock
@@ -18,12 +18,11 @@ from binaryninja import (
     RegisterValueType,
     LowLevelILOperation,
     LowLevelILInstruction,
-    InstructionTextTokenType,
 )
 
 import capa.features.extractors.helpers
 from capa.features.insn import API, MAX_STRUCTURE_SIZE, Number, Offset, Mnemonic, OperandNumber, OperandOffset
-from capa.features.common import MAX_BYTES_FEATURE_SIZE, THUNK_CHAIN_DEPTH_DELTA, Bytes, String, Feature, Characteristic
+from capa.features.common import MAX_BYTES_FEATURE_SIZE, Bytes, String, Feature, Characteristic
 from capa.features.address import Address, AbsoluteVirtualAddress
 from capa.features.extractors.binja.helpers import DisassemblyInstruction, visit_llil_exprs
 from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle
@@ -73,7 +72,6 @@ def extract_insn_api_features(fh: FunctionHandle, bbh: BBHandle, ih: InsnHandle)
     example:
        call dword [0x00473038]
     """
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
     bv: BinaryView = func.view
 
@@ -128,12 +126,9 @@ def extract_insn_number_features(
     example:
         push    3136B0h         ; dwControlCode
     """
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
-    bv: BinaryView = func.view
 
     results: List[Tuple[Any[Number, OperandNumber], Address]] = []
-    address_size = func.view.arch.address_size * 8
 
     def llil_checker(il: LowLevelILInstruction, parent: LowLevelILInstruction, index: int) -> bool:
         if il.operation == LowLevelILOperation.LLIL_LOAD:
@@ -171,7 +166,6 @@ def extract_insn_bytes_features(fh: FunctionHandle, bbh: BBHandle, ih: InsnHandl
     example:
         push    offset iid_004118d4_IShellLinkA ; riid
     """
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
     bv: BinaryView = func.view
 
@@ -220,7 +214,6 @@ def extract_insn_string_features(
     example:
         push offset aAcr     ; "ACR  > "
     """
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
     bv: BinaryView = func.view
 
@@ -278,7 +271,6 @@ def extract_insn_offset_features(
     example:
         .text:0040112F cmp [esi+4], ebx
     """
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
 
     results: List[Tuple[Any[Offset, OperandOffset], Address]] = []
@@ -364,7 +356,6 @@ def extract_insn_nzxor_characteristic_features(
     parse instruction non-zeroing XOR instruction
     ignore expected non-zeroing XORs, e.g. security cookies
     """
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
 
     results = []
@@ -414,7 +405,6 @@ def extract_insn_peb_access_characteristic_features(
 
     fs:[0x30] on x86, gs:[0x60] on x64
     """
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
 
     results = []
@@ -456,7 +446,6 @@ def extract_insn_segment_access_features(
     fh: FunctionHandle, bbh: BBHandle, ih: InsnHandle
 ) -> Iterator[Tuple[Feature, Address]]:
     """parse instruction fs or gs access"""
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
 
     results = []
@@ -485,7 +474,6 @@ def extract_insn_cross_section_cflow(
     fh: FunctionHandle, bbh: BBHandle, ih: InsnHandle
 ) -> Iterator[Tuple[Feature, Address]]:
     """inspect the instruction for a CALL or JMP that crosses section boundaries"""
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
     bv: BinaryView = func.view
 
@@ -509,7 +497,6 @@ def extract_function_calls_from(fh: FunctionHandle, bbh: BBHandle, ih: InsnHandl
 
     most relevant at the function scope, however, its most efficient to extract at the instruction scope
     """
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
     bv: BinaryView = func.view
 
@@ -555,7 +542,6 @@ def extract_function_indirect_call_characteristic_features(
     most relevant at the function or basic block scope;
     however, its most efficient to extract at the instruction scope
     """
-    insn: DisassemblyInstruction = ih.inner
     func: Function = fh.inner
 
     llil = func.get_llil_at(ih.address)
diff --git a/capa/features/extractors/dnfile/insn.py b/capa/features/extractors/dnfile/insn.py
index 431423a6..b70f39dc 100644
--- a/capa/features/extractors/dnfile/insn.py
+++ b/capa/features/extractors/dnfile/insn.py
@@ -9,7 +9,7 @@
 from __future__ import annotations
 
 import logging
-from typing import TYPE_CHECKING, Any, Dict, Tuple, Union, Iterator, Optional
+from typing import TYPE_CHECKING, Tuple, Union, Iterator, Optional
 
 if TYPE_CHECKING:
     from capa.features.extractors.dnfile.extractor import DnFileFeatureExtractorCache
diff --git a/capa/features/extractors/dnfile/types.py b/capa/features/extractors/dnfile/types.py
index 822b5d67..5982a1fe 100644
--- a/capa/features/extractors/dnfile/types.py
+++ b/capa/features/extractors/dnfile/types.py
@@ -6,8 +6,7 @@
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
 
-from enum import Enum
-from typing import Union, Optional
+from typing import Optional
 
 
 class DnType(object):
diff --git a/capa/features/extractors/dotnetfile.py b/capa/features/extractors/dotnetfile.py
index 7a1abb57..bf759419 100644
--- a/capa/features/extractors/dotnetfile.py
+++ b/capa/features/extractors/dotnetfile.py
@@ -1,5 +1,5 @@
 import logging
-from typing import Tuple, Iterator, cast
+from typing import Tuple, Iterator
 
 import dnfile
 import pefile
diff --git a/capa/features/extractors/viv/file.py b/capa/features/extractors/viv/file.py
index a28045b3..0deee2c7 100644
--- a/capa/features/extractors/viv/file.py
+++ b/capa/features/extractors/viv/file.py
@@ -16,7 +16,7 @@ import capa.features.extractors.common
 import capa.features.extractors.helpers
 import capa.features.extractors.strings
 from capa.features.file import Export, Import, Section, FunctionName
-from capa.features.common import String, Feature, Characteristic
+from capa.features.common import Feature, Characteristic
 from capa.features.address import Address, FileOffsetAddress, AbsoluteVirtualAddress
 
 
diff --git a/capa/features/extractors/viv/indirect_calls.py b/capa/features/extractors/viv/indirect_calls.py
index f76c13f8..0855d56f 100644
--- a/capa/features/extractors/viv/indirect_calls.py
+++ b/capa/features/extractors/viv/indirect_calls.py
@@ -87,8 +87,8 @@ def find_definition(vw: VivWorkspace, va: int, reg: int) -> Tuple[int, Union[int
     raises:
       NotFoundError: when the definition cannot be found.
     """
-    q = collections.deque()  # type: Deque[int]
-    seen = set([])  # type: Set[int]
+    q: Deque[int] = collections.deque()
+    seen: Set[int] = set([])
 
     q.extend(get_previous_instructions(vw, va))
     while q:
diff --git a/capa/features/extractors/viv/insn.py b/capa/features/extractors/viv/insn.py
index d8d6edbe..27c65b5f 100644
--- a/capa/features/extractors/viv/insn.py
+++ b/capa/features/extractors/viv/insn.py
@@ -19,11 +19,10 @@ import envi.archs.amd64.disasm
 
 import capa.features.extractors.helpers
 import capa.features.extractors.viv.helpers
-from capa.features.file import FunctionName
 from capa.features.insn import API, MAX_STRUCTURE_SIZE, Number, Offset, Mnemonic, OperandNumber, OperandOffset
 from capa.features.common import MAX_BYTES_FEATURE_SIZE, THUNK_CHAIN_DEPTH_DELTA, Bytes, String, Feature, Characteristic
 from capa.features.address import Address, AbsoluteVirtualAddress
-from capa.features.extractors.elf import Shdr, SymTab
+from capa.features.extractors.elf import SymTab
 from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle
 from capa.features.extractors.viv.indirect_calls import NotFoundError, resolve_indirect_call
 
diff --git a/capa/features/freeze/__init__.py b/capa/features/freeze/__init__.py
index d0eb720c..38900578 100644
--- a/capa/features/freeze/__init__.py
+++ b/capa/features/freeze/__init__.py
@@ -12,7 +12,7 @@ See the License for the specific language governing permissions and limitations
 import zlib
 import logging
 from enum import Enum
-from typing import Any, List, Tuple, Union
+from typing import List, Tuple, Union
 
 from pydantic import Field, BaseModel
 
diff --git a/capa/helpers.py b/capa/helpers.py
index 38bd2d56..77534b50 100644
--- a/capa/helpers.py
+++ b/capa/helpers.py
@@ -9,6 +9,7 @@ import os
 import inspect
 import logging
 import contextlib
+import importlib.util
 from typing import NoReturn
 
 import tqdm
@@ -40,12 +41,7 @@ def get_file_taste(sample_path: str) -> bytes:
 
 
 def is_runtime_ida():
-    try:
-        import idc
-    except ImportError:
-        return False
-    else:
-        return True
+    return importlib.util.find_spec("idc") is not None
 
 
 def assert_never(value) -> NoReturn:
diff --git a/capa/ida/plugin/cache.py b/capa/ida/plugin/cache.py
index 5226df9f..69a3a3d3 100644
--- a/capa/ida/plugin/cache.py
+++ b/capa/ida/plugin/cache.py
@@ -10,7 +10,7 @@ from __future__ import annotations
 
 import itertools
 import collections
-from typing import Set, Dict, List, Tuple, Union, Optional
+from typing import Set, Dict, Tuple, Union, Optional
 
 import capa.engine
 from capa.rules import Scope, RuleSet
diff --git a/capa/ida/plugin/form.py b/capa/ida/plugin/form.py
index 07fbe69f..b1319651 100644
--- a/capa/ida/plugin/form.py
+++ b/capa/ida/plugin/form.py
@@ -587,7 +587,7 @@ class CapaExplorerForm(idaapi.PluginForm):
                 rules_message.setText("You must specify a directory containing capa rules before running analysis.")
                 rules_message.setInformativeText(
                     "Click 'Ok' to specify a local directory of rules or you can download and extract the official "
-                    f"rules from the URL listed in the details."
+                    "rules from the URL listed in the details."
                 )
                 rules_message.setDetailedText(f"{CAPA_OFFICIAL_RULESET_URL}")
                 rules_message.setStandardButtons(QtWidgets.QMessageBox.Ok | QtWidgets.QMessageBox.Cancel)
@@ -606,7 +606,7 @@ class CapaExplorerForm(idaapi.PluginForm):
                     return False
 
                 settings.user[CAPA_SETTINGS_RULE_PATH] = path
-        except UserCancelledError as e:
+        except UserCancelledError:
             capa.ida.helpers.inform_user_ida_ui("Analysis requires capa rules")
             logger.warning(
                 "You must specify a directory containing capa rules before running analysis.%s",
diff --git a/capa/main.py b/capa/main.py
index cf8e3a63..b707fe9b 100644
--- a/capa/main.py
+++ b/capa/main.py
@@ -34,6 +34,7 @@ import capa.perf
 import capa.rules
 import capa.engine
 import capa.version
+import capa.helpers
 import capa.render.json
 import capa.rules.cache
 import capa.render.default
@@ -1339,17 +1340,8 @@ def ida_main():
     print(capa.render.default.render(meta, rules, capabilities))
 
 
-def is_runtime_ida():
-    try:
-        import idc
-    except ImportError:
-        return False
-    else:
-        return True
-
-
 if __name__ == "__main__":
-    if is_runtime_ida():
+    if capa.helpers.is_runtime_ida():
         ida_main()
     else:
         sys.exit(main())
diff --git a/capa/render/default.py b/capa/render/default.py
index 15e2a5e8..1cd07c38 100644
--- a/capa/render/default.py
+++ b/capa/render/default.py
@@ -11,7 +11,6 @@ import collections
 import tabulate
 
 import capa.render.utils as rutils
-import capa.features.freeze as frz
 import capa.render.result_document as rd
 import capa.features.freeze.features as frzf
 from capa.rules import RuleSet
diff --git a/capa/render/proto/__init__.py b/capa/render/proto/__init__.py
index 66a06c82..e895ae94 100644
--- a/capa/render/proto/__init__.py
+++ b/capa/render/proto/__init__.py
@@ -24,14 +24,10 @@ $ protoc.exe --python_out=. --mypy_out=. <path_to_proto> (e.g. capa/render/proto
 
 Alternatively, --pyi_out=. can be used to generate a Python Interface file that supports development
 """
-import sys
-import json
-import argparse
 import datetime
 from typing import Any, Dict, Union
 
 import google.protobuf.json_format
-from google.protobuf.json_format import MessageToJson
 
 import capa.rules
 import capa.features.freeze as frz
diff --git a/capa/render/result_document.py b/capa/render/result_document.py
index 21957ddf..944365e6 100644
--- a/capa/render/result_document.py
+++ b/capa/render/result_document.py
@@ -7,7 +7,7 @@
 # See the License for the specific language governing permissions and limitations under the License.
 import datetime
 import collections
-from typing import Any, Dict, List, Tuple, Union, Optional
+from typing import Dict, List, Tuple, Union, Optional
 
 from pydantic import Field, BaseModel
 
diff --git a/scripts/cache-ruleset.py b/scripts/cache-ruleset.py
index a2a49bdb..8c24497e 100644
--- a/scripts/cache-ruleset.py
+++ b/scripts/cache-ruleset.py
@@ -17,7 +17,6 @@ See the License for the specific language governing permissions and limitations
 """
 import os
 import sys
-import time
 import logging
 import argparse
 
diff --git a/scripts/capa_as_library.py b/scripts/capa_as_library.py
index 57657018..242e4e9c 100644
--- a/scripts/capa_as_library.py
+++ b/scripts/capa_as_library.py
@@ -2,7 +2,7 @@
 
 import json
 import collections
-from typing import Any, Dict
+from typing import Any, Dict, Set
 
 import capa.main
 import capa.rules
@@ -13,7 +13,6 @@ import capa.render.utils as rutils
 import capa.render.default
 import capa.render.result_document as rd
 import capa.features.freeze.features as frzf
-from capa.engine import *
 from capa.features.common import OS_AUTO, FORMAT_AUTO
 
 
diff --git a/scripts/lint.py b/scripts/lint.py
index 8348cdea..ff2e8bd8 100644
--- a/scripts/lint.py
+++ b/scripts/lint.py
@@ -43,7 +43,7 @@ import capa.engine
 import capa.helpers
 import capa.features.insn
 from capa.rules import Rule, RuleSet
-from capa.features.common import OS_AUTO, FORMAT_PE, FORMAT_DOTNET, String, Feature, Substring
+from capa.features.common import OS_AUTO, String, Feature, Substring
 from capa.render.result_document import RuleMetadata
 
 logger = logging.getLogger("lint")
diff --git a/tests/fixtures.py b/tests/fixtures.py
index 84e40209..21eae8f7 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -10,7 +10,6 @@
 import os
 import os.path
 import binascii
-import itertools
 import contextlib
 import collections
 from typing import Set, Dict
diff --git a/tests/test_binja_features.py b/tests/test_binja_features.py
index 04c8a49e..9bc5a995 100644
--- a/tests/test_binja_features.py
+++ b/tests/test_binja_features.py
@@ -5,10 +5,11 @@
 # Unless required by applicable law or agreed to in writing, software distributed under the License
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
+import os
 import logging
 
+import pytest
 import fixtures
-from fixtures import *
 
 import capa.main
 
@@ -22,7 +23,7 @@ try:
 
     try:
         binaryninja.load(source=b"\x90")
-    except RuntimeError as e:
+    except RuntimeError:
         logger.warning("Binary Ninja license is not valid, provide via $BN_LICENSE or license.dat")
     else:
         binja_present = True
diff --git a/tests/test_dnfile_features.py b/tests/test_dnfile_features.py
index 76540468..664b699b 100644
--- a/tests/test_dnfile_features.py
+++ b/tests/test_dnfile_features.py
@@ -6,9 +6,7 @@
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
 
-import pytest
 import fixtures
-from fixtures import *
 from fixtures import parametrize
 
 
diff --git a/tests/test_dotnet_features.py b/tests/test_dotnet_features.py
index 9980a730..5227c892 100644
--- a/tests/test_dotnet_features.py
+++ b/tests/test_dotnet_features.py
@@ -6,9 +6,7 @@
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
 
-import pytest
 import fixtures
-from fixtures import *
 from fixtures import parametrize
 
 
diff --git a/tests/test_dotnetfile_features.py b/tests/test_dotnetfile_features.py
index 28d63cdb..a4af0da0 100644
--- a/tests/test_dotnetfile_features.py
+++ b/tests/test_dotnetfile_features.py
@@ -8,9 +8,10 @@
 
 import pytest
 import fixtures
-from fixtures import *
 from fixtures import parametrize
 
+import capa.features.file
+
 
 @parametrize(
     "sample,scope,feature,expected",
diff --git a/tests/test_engine.py b/tests/test_engine.py
index c070edb8..a3e8efd0 100644
--- a/tests/test_engine.py
+++ b/tests/test_engine.py
@@ -6,9 +6,8 @@
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
 import capa.features.address
-from capa.engine import *
-from capa.features import *
-from capa.features.insn import *
+from capa.engine import And, Or, Not, Some, Range
+from capa.features.insn import Number
 
 ADDR1 = capa.features.address.AbsoluteVirtualAddress(0x401001)
 ADDR2 = capa.features.address.AbsoluteVirtualAddress(0x401002)
diff --git a/tests/test_freeze.py b/tests/test_freeze.py
index 2c5f1920..8a31a03b 100644
--- a/tests/test_freeze.py
+++ b/tests/test_freeze.py
@@ -8,7 +8,8 @@
 import textwrap
 from typing import List
 
-from fixtures import *
+import pytest
+from fixtures import z9324d_extractor
 
 import capa.main
 import capa.rules
@@ -20,7 +21,8 @@ import capa.features.freeze
 import capa.features.basicblock
 import capa.features.extractors.null
 import capa.features.extractors.base_extractor
-from capa.features.address import AbsoluteVirtualAddress
+from capa.features.extractors.base_extractor import FunctionHandle, BBHandle
+from capa.features.address import AbsoluteVirtualAddress, Address
 
 EXTRACTOR = capa.features.extractors.null.NullFeatureExtractor(
     base_address=AbsoluteVirtualAddress(0x401000),
diff --git a/tests/test_ida_features.py b/tests/test_ida_features.py
index 99e7d5a1..e37258d3 100644
--- a/tests/test_ida_features.py
+++ b/tests/test_ida_features.py
@@ -55,7 +55,6 @@ import pytest
 try:
     sys.path.append(os.path.dirname(__file__))
     import fixtures
-    from fixtures import *
 finally:
     sys.path.pop()
 
@@ -104,7 +103,7 @@ def test_ida_features():
 
         try:
             fixtures.do_test_feature_presence(get_ida_extractor, sample, scope, feature, expected)
-        except Exception as e:
+        except Exception:
             f = io.StringIO()
             traceback.print_exc(file=f)
             yield this_name, id, "fail", f.getvalue()
@@ -130,7 +129,7 @@ def test_ida_feature_counts():
 
         try:
             fixtures.do_test_feature_count(get_ida_extractor, sample, scope, feature, expected)
-        except Exception as e:
+        except Exception:
             f = io.StringIO()
             traceback.print_exc(file=f)
             yield this_name, id, "fail", f.getvalue()
diff --git a/tests/test_main.py b/tests/test_main.py
index d17e6e64..e76ee4ed 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -10,7 +10,6 @@ import json
 import textwrap
 
 import fixtures
-from fixtures import *
 from fixtures import (
     _692f_dotnetfile_extractor,
     _1c444_dotnetfile_extractor,
@@ -22,7 +21,6 @@ import capa.main
 import capa.rules
 import capa.engine
 import capa.features
-from capa.engine import *
 
 
 def test_main(z9324d_extractor):
diff --git a/tests/test_match.py b/tests/test_match.py
index fc3583f7..2810e599 100644
--- a/tests/test_match.py
+++ b/tests/test_match.py
@@ -13,8 +13,7 @@ import capa.engine
 import capa.features.insn
 import capa.features.common
 from capa.rules import Scope
-from capa.features.insn import *
-from capa.features.common import *
+from capa.features.common import MatchedRule, String, OS, OS_ANY, OS_WINDOWS
 
 
 def match(rules, features, va, scope=Scope.FUNCTION):
diff --git a/tests/test_optimizer.py b/tests/test_optimizer.py
index d07ba330..40c008fa 100644
--- a/tests/test_optimizer.py
+++ b/tests/test_optimizer.py
@@ -8,15 +8,13 @@
 
 import textwrap
 
-import pytest
-
 import capa.rules
 import capa.engine
 import capa.optimizer
 import capa.features.common
 from capa.engine import Or, And
 from capa.features.insn import Mnemonic
-from capa.features.common import Arch, Bytes, Substring
+from capa.features.common import Arch, Substring
 
 
 def test_optimizer_order():
diff --git a/tests/test_os_detection.py b/tests/test_os_detection.py
index 585aada2..d7bdb55c 100644
--- a/tests/test_os_detection.py
+++ b/tests/test_os_detection.py
@@ -9,8 +9,7 @@
 import io
 import zlib
 
-import pytest
-from fixtures import *
+from fixtures import get_data_path_by_name
 
 import capa.features.extractors.elf
 
diff --git a/tests/test_pefile_features.py b/tests/test_pefile_features.py
index e0b735e8..6f4a59bf 100644
--- a/tests/test_pefile_features.py
+++ b/tests/test_pefile_features.py
@@ -7,7 +7,6 @@
 # See the License for the specific language governing permissions and limitations under the License.
 import pytest
 import fixtures
-from fixtures import *
 from fixtures import parametrize
 
 import capa.features.file
diff --git a/tests/test_proto.py b/tests/test_proto.py
index 64c950bc..06476c15 100644
--- a/tests/test_proto.py
+++ b/tests/test_proto.py
@@ -8,7 +8,7 @@
 import copy
 from typing import Any
 
-from fixtures import *
+import pytest
 
 import capa.rules
 import capa.render
diff --git a/tests/test_result_document.py b/tests/test_result_document.py
index 5ae9af26..1a1b656f 100644
--- a/tests/test_result_document.py
+++ b/tests/test_result_document.py
@@ -9,7 +9,6 @@ import copy
 
 import pytest
 import fixtures
-from fixtures import *
 
 import capa
 import capa.engine as ceng
diff --git a/tests/test_rules.py b/tests/test_rules.py
index 9f07f31d..69875508 100644
--- a/tests/test_rules.py
+++ b/tests/test_rules.py
@@ -344,7 +344,7 @@ def test_subscope_rules():
 
 def test_duplicate_rules():
     with pytest.raises(capa.rules.InvalidRule):
-        rules = capa.rules.RuleSet(
+        _ = capa.rules.RuleSet(
             [
                 capa.rules.Rule.from_yaml(
                     textwrap.dedent(
@@ -374,7 +374,7 @@ def test_duplicate_rules():
 
 def test_missing_dependency():
     with pytest.raises(capa.rules.InvalidRule):
-        rules = capa.rules.RuleSet(
+        _ = capa.rules.RuleSet(
             [
                 capa.rules.Rule.from_yaml(
                     textwrap.dedent(
@@ -393,7 +393,7 @@ def test_missing_dependency():
 
 def test_invalid_rules():
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -406,7 +406,7 @@ def test_invalid_rules():
         )
 
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -420,7 +420,7 @@ def test_invalid_rules():
 
     # att&ck and mbc must be lists
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -433,7 +433,7 @@ def test_invalid_rules():
             )
         )
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -497,7 +497,7 @@ def test_count_number_symbol():
 
 def test_invalid_number():
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -510,7 +510,7 @@ def test_invalid_number():
         )
 
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -523,7 +523,7 @@ def test_invalid_number():
         )
 
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -583,7 +583,7 @@ def test_count_offset_symbol():
 
 def test_invalid_offset():
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -596,7 +596,7 @@ def test_invalid_offset():
         )
 
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -609,7 +609,7 @@ def test_invalid_offset():
         )
 
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -624,7 +624,7 @@ def test_invalid_offset():
 
 def test_invalid_string_values_int():
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
@@ -637,7 +637,7 @@ def test_invalid_string_values_int():
         )
 
     with pytest.raises(capa.rules.InvalidRule):
-        r = capa.rules.Rule.from_yaml(
+        _ = capa.rules.Rule.from_yaml(
             textwrap.dedent(
                 """
                 rule:
diff --git a/tests/test_scripts.py b/tests/test_scripts.py
index 2d8fefac..3e673466 100644
--- a/tests/test_scripts.py
+++ b/tests/test_scripts.py
@@ -12,7 +12,6 @@ import textwrap
 import subprocess
 
 import pytest
-from fixtures import *
 
 CD = os.path.dirname(__file__)
 
diff --git a/tests/test_viv_features.py b/tests/test_viv_features.py
index 58ce5ace..ca26f693 100644
--- a/tests/test_viv_features.py
+++ b/tests/test_viv_features.py
@@ -6,7 +6,6 @@
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
 import fixtures
-from fixtures import *
 
 
 @fixtures.parametrize(