diff --git a/httpie/config.py b/httpie/config.py
index 65a10eb0..5960a6bb 100644
--- a/httpie/config.py
+++ b/httpie/config.py
@@ -84,7 +84,7 @@ class BaseConfigDict(dict):
     def load(self):
         config_type = type(self).__name__.lower()
         try:
-            with self.path.open('rt') as f:
+            with self.path.open() as f:
                 try:
                     data = json.load(f)
                 except ValueError as e:
diff --git a/httpie/plugins/__init__.py b/httpie/plugins/__init__.py
index a3ee528c..301abf1b 100644
--- a/httpie/plugins/__init__.py
+++ b/httpie/plugins/__init__.py
@@ -7,3 +7,5 @@ from .base import (
     AuthPlugin, FormatterPlugin,
     ConverterPlugin, TransportPlugin
 )
+
+__all__ = ('AuthPlugin', 'ConverterPlugin', 'FormatterPlugin', 'TransportPlugin')
diff --git a/tests/conftest.py b/tests/conftest.py
index 282d231c..ff79ed17 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -40,4 +40,4 @@ def _httpbin_with_chunked_support_available():
 def httpbin_with_chunked_support(_httpbin_with_chunked_support_available):
     if _httpbin_with_chunked_support_available:
         return HTTPBIN_WITH_CHUNKED_SUPPORT
-    pytest.skip('{} not resolvable'.format(HTTPBIN_WITH_CHUNKED_SUPPORT_DOMAIN))
+    pytest.skip(f'{HTTPBIN_WITH_CHUNKED_SUPPORT_DOMAIN} not resolvable')
diff --git a/tests/test_config.py b/tests/test_config.py
index 5848106a..7b990edb 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -25,8 +25,7 @@ def test_default_options(httpbin):
 def test_config_file_not_valid(httpbin):
     env = MockEnvironment()
     env.create_temp_config_dir()
-    with (env.config_dir / Config.FILENAME).open('w') as f:
-        f.write('{invalid json}')
+    (env.config_dir / Config.FILENAME).write_text('{invalid json}')
     r = http(httpbin + '/get', env=env)
     assert HTTP_OK in r
     assert 'http: warning' in r.stderr
diff --git a/tests/test_output.py b/tests/test_output.py
index b602eeff..a9edbf4c 100644
--- a/tests/test_output.py
+++ b/tests/test_output.py
@@ -6,7 +6,6 @@ import json
 import os
 import tempfile
 import io
-from tempfile import gettempdir
 from urllib.request import urlopen
 
 import pytest
@@ -23,17 +22,16 @@ from .utils import COLOR, CRLF, HTTP_OK, MockEnvironment, http
 
 
 @pytest.mark.parametrize('stdout_isatty', [True, False])
-def test_output_option(httpbin, stdout_isatty):
-    output_filename = os.path.join(gettempdir(), test_output_option.__name__)
+def test_output_option(tmp_path, httpbin, stdout_isatty):
+    output_filename = tmp_path / 'test_output_option'
     url = httpbin + '/robots.txt'
 
-    r = http('--output', output_filename, url,
+    r = http('--output', str(output_filename), url,
              env=MockEnvironment(stdout_isatty=stdout_isatty))
     assert r == ''
 
     expected_body = urlopen(url).read().decode()
-    with open(output_filename, 'r') as f:
-        actual_body = f.read()
+    actual_body = output_filename.read_text()
 
     assert actual_body == expected_body
 
@@ -103,35 +101,34 @@ class TestQuietFlag:
         assert r.stderr == ''
 
     @pytest.mark.parametrize('with_download', [True, False])
-    def test_quiet_with_output_redirection(self, httpbin, with_download):
+    def test_quiet_with_output_redirection(self, tmp_path, httpbin, with_download):
         url = httpbin + '/robots.txt'
         output_path = Path('output.txt')
         env = MockEnvironment()
         orig_cwd = os.getcwd()
         output = requests.get(url).text
         extra_args = ['--download'] if with_download else []
-        with tempfile.TemporaryDirectory() as tmp_dirname:
-            os.chdir(tmp_dirname)
-            try:
-                assert os.listdir('.') == []
-                r = http(
-                    '--quiet',
-                    '--output', str(output_path),
-                    *extra_args,
-                    url,
-                    env=env
-                )
-                assert os.listdir('.') == [str(output_path)]
-                assert r == ''
-                assert r.stderr == ''
-                assert env.stderr is env.devnull
-                if with_download:
-                    assert env.stdout is env.devnull
-                else:
-                    assert env.stdout is not env.devnull  # --output swaps stdout.
-                assert output_path.read_text() == output
-            finally:
-                os.chdir(orig_cwd)
+        os.chdir(tmp_path)
+        try:
+            assert os.listdir('.') == []
+            r = http(
+                '--quiet',
+                '--output', str(output_path),
+                *extra_args,
+                url,
+                env=env
+            )
+            assert os.listdir('.') == [str(output_path)]
+            assert r == ''
+            assert r.stderr == ''
+            assert env.stderr is env.devnull
+            if with_download:
+                assert env.stdout is env.devnull
+            else:
+                assert env.stdout is not env.devnull  # --output swaps stdout.
+            assert output_path.read_text() == output
+        finally:
+            os.chdir(orig_cwd)
 
 
 class TestVerboseFlag:
diff --git a/tests/test_sessions.py b/tests/test_sessions.py
index 5718832e..eaa923ef 100644
--- a/tests/test_sessions.py
+++ b/tests/test_sessions.py
@@ -3,7 +3,6 @@ import os
 import shutil
 from datetime import datetime
 from unittest import mock
-from tempfile import gettempdir
 
 import pytest
 
@@ -209,11 +208,11 @@ class TestSession(SessionTestBase):
         assert HTTP_OK in r2
         assert r2.json['headers']['User-Agent'] == 'custom'
 
-    def test_download_in_session(self, httpbin):
+    def test_download_in_session(self, tmp_path, httpbin):
         # https://github.com/httpie/httpie/issues/412
         self.start_session(httpbin)
         cwd = os.getcwd()
-        os.chdir(gettempdir())
+        os.chdir(tmp_path)
         try:
             http('--session=test', '--download',
                  httpbin.url + '/get', env=self.env())
diff --git a/tests/test_uploads.py b/tests/test_uploads.py
index 3b97fccf..ca424020 100644
--- a/tests/test_uploads.py
+++ b/tests/test_uploads.py
@@ -53,7 +53,8 @@ def test_chunked_stdin(httpbin_with_chunked_support):
 
 
 def test_chunked_stdin_multiple_chunks(httpbin_with_chunked_support):
-    stdin_bytes = FILE_PATH.read_bytes() + b'\n' + FILE_PATH.read_bytes()
+    data = FILE_PATH.read_bytes()
+    stdin_bytes = data + b'\n' + data
     r = http(
         '--verbose',
         '--chunked',
diff --git a/tests/test_windows.py b/tests/test_windows.py
index 0282fa98..9354cb83 100644
--- a/tests/test_windows.py
+++ b/tests/test_windows.py
@@ -19,13 +19,10 @@ class TestWindowsOnly:
 
 
 class TestFakeWindows:
-    def test_output_file_pretty_not_allowed_on_windows(self, httpbin):
+    def test_output_file_pretty_not_allowed_on_windows(self, tmp_path, httpbin):
         env = MockEnvironment(is_windows=True)
-        output_file = os.path.join(
-            tempfile.gettempdir(),
-            self.test_output_file_pretty_not_allowed_on_windows.__name__
-        )
-        r = http('--output', output_file,
+        output_file = tmp_path / 'test_output_file_pretty_not_allowed_on_windows'
+        r = http('--output', str(output_file),
                  '--pretty=all', 'GET', httpbin.url + '/get',
                  env=env, tolerate_error_exit_status=True)
         assert 'Only terminal output can be colorized on Windows' in r.stderr