diff --git a/.github/workflows/code-check.yml b/.github/workflows/code-check.yml
index b6cf8fd..021b1e4 100644
--- a/.github/workflows/code-check.yml
+++ b/.github/workflows/code-check.yml
@@ -14,6 +14,10 @@ jobs:
   check:
     name: Check Code
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+      fail-fast: false
 
     steps:
     - name: Check out from Git
diff --git a/.github/workflows/python-build-test.yml b/.github/workflows/python-build-test.yml
index c8a1031..d2be143 100644
--- a/.github/workflows/python-build-test.yml
+++ b/.github/workflows/python-build-test.yml
@@ -12,10 +12,10 @@ permissions:
 
 jobs:
   build:
-
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
         python-version: ["3.8", "3.9", "3.10", "3.11"]
       fail-fast: false
 
@@ -41,6 +41,7 @@ jobs:
       run: |
         inv build
         inv build.mkdocs
+
   build-rust:
     runs-on: ubuntu-latest
     strategy:
diff --git a/tests/keystore_test.py b/tests/keystore_test.py
index 2e73039..2a3d48d 100644
--- a/tests/keystore_test.py
+++ b/tests/keystore_test.py
@@ -18,6 +18,8 @@
 import asyncio
 import json
 import logging
+import pathlib
+import pytest
 import tempfile
 import os
 
@@ -83,87 +85,95 @@ JSON3 = """
 
 
 # -----------------------------------------------------------------------------
-async def test_basic():
-    with tempfile.NamedTemporaryFile(mode="r+", encoding='utf-8') as file:
-        keystore = JsonKeyStore('my_namespace', file.name)
+@pytest.fixture
+def temporary_file():
+    file = tempfile.NamedTemporaryFile(delete=False)
+    file.close()
+    yield file.name
+    pathlib.Path(file.name).unlink()
+
+
+# -----------------------------------------------------------------------------
+async def test_basic(temporary_file):
+    with open(temporary_file, mode='w', encoding='utf-8') as file:
         file.write("{}")
         file.flush()
 
-        keys = await keystore.get_all()
-        assert len(keys) == 0
+    keystore = JsonKeyStore('my_namespace', temporary_file)
 
-        keys = PairingKeys()
-        await keystore.update('foo', keys)
-        foo = await keystore.get('foo')
-        assert foo is not None
-        assert foo.ltk is None
-        ltk = bytes([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15])
-        keys.ltk = PairingKeys.Key(ltk)
-        await keystore.update('foo', keys)
-        foo = await keystore.get('foo')
-        assert foo is not None
-        assert foo.ltk is not None
-        assert foo.ltk.value == ltk
+    keys = await keystore.get_all()
+    assert len(keys) == 0
 
-        file.flush()
-        with open(file.name, "r", encoding="utf-8") as json_file:
-            json_data = json.load(json_file)
-            assert 'my_namespace' in json_data
-            assert 'foo' in json_data['my_namespace']
-            assert 'ltk' in json_data['my_namespace']['foo']
+    keys = PairingKeys()
+    await keystore.update('foo', keys)
+    foo = await keystore.get('foo')
+    assert foo is not None
+    assert foo.ltk is None
+    ltk = bytes([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15])
+    keys.ltk = PairingKeys.Key(ltk)
+    await keystore.update('foo', keys)
+    foo = await keystore.get('foo')
+    assert foo is not None
+    assert foo.ltk is not None
+    assert foo.ltk.value == ltk
+
+    with open(file.name, "r", encoding="utf-8") as json_file:
+        json_data = json.load(json_file)
+        assert 'my_namespace' in json_data
+        assert 'foo' in json_data['my_namespace']
+        assert 'ltk' in json_data['my_namespace']['foo']
 
 
 # -----------------------------------------------------------------------------
-async def test_parsing():
-    with tempfile.NamedTemporaryFile(mode="w", encoding='utf-8') as file:
-        keystore = JsonKeyStore('my_namespace', file.name)
+async def test_parsing(temporary_file):
+    with open(temporary_file, mode='w', encoding='utf-8') as file:
         file.write(JSON1)
         file.flush()
 
-        foo = await keystore.get('14:7D:DA:4E:53:A8/P')
-        assert foo is not None
-        assert foo.ltk.value == bytes.fromhex('d1897ee10016eb1a08e4e037fd54c683')
+    keystore = JsonKeyStore('my_namespace', file.name)
+    foo = await keystore.get('14:7D:DA:4E:53:A8/P')
+    assert foo is not None
+    assert foo.ltk.value == bytes.fromhex('d1897ee10016eb1a08e4e037fd54c683')
 
 
 # -----------------------------------------------------------------------------
-async def test_default_namespace():
-    with tempfile.NamedTemporaryFile(mode="w", encoding='utf-8') as file:
-        keystore = JsonKeyStore(None, file.name)
+async def test_default_namespace(temporary_file):
+    with open(temporary_file, mode='w', encoding='utf-8') as file:
         file.write(JSON1)
         file.flush()
 
-        all_keys = await keystore.get_all()
-        assert len(all_keys) == 1
-        name, keys = all_keys[0]
-        assert name == '14:7D:DA:4E:53:A8/P'
-        assert keys.irk.value == bytes.fromhex('e7b2543b206e4e46b44f9e51dad22bd1')
+    keystore = JsonKeyStore(None, file.name)
+    all_keys = await keystore.get_all()
+    assert len(all_keys) == 1
+    name, keys = all_keys[0]
+    assert name == '14:7D:DA:4E:53:A8/P'
+    assert keys.irk.value == bytes.fromhex('e7b2543b206e4e46b44f9e51dad22bd1')
 
-    with tempfile.NamedTemporaryFile(mode="w", encoding='utf-8') as file:
-        keystore = JsonKeyStore(None, file.name)
+    with open(temporary_file, mode='w', encoding='utf-8') as file:
         file.write(JSON2)
         file.flush()
 
-        keys = PairingKeys()
-        ltk = bytes([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15])
-        keys.ltk = PairingKeys.Key(ltk)
-        await keystore.update('foo', keys)
-        file.flush()
-        with open(file.name, "r", encoding="utf-8") as json_file:
-            json_data = json.load(json_file)
-            assert '__DEFAULT__' in json_data
-            assert 'foo' in json_data['__DEFAULT__']
-            assert 'ltk' in json_data['__DEFAULT__']['foo']
+    keystore = JsonKeyStore(None, file.name)
+    keys = PairingKeys()
+    ltk = bytes([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15])
+    keys.ltk = PairingKeys.Key(ltk)
+    await keystore.update('foo', keys)
+    with open(file.name, "r", encoding="utf-8") as json_file:
+        json_data = json.load(json_file)
+        assert '__DEFAULT__' in json_data
+        assert 'foo' in json_data['__DEFAULT__']
+        assert 'ltk' in json_data['__DEFAULT__']['foo']
 
-    with tempfile.NamedTemporaryFile(mode="w", encoding='utf-8') as file:
-        keystore = JsonKeyStore(None, file.name)
+    with open(temporary_file, mode='w', encoding='utf-8') as file:
         file.write(JSON3)
         file.flush()
 
-        all_keys = await keystore.get_all()
-        assert len(all_keys) == 1
-        name, keys = all_keys[0]
-        assert name == '14:7D:DA:4E:53:A8/P'
-        assert keys.irk.value == bytes.fromhex('e7b2543b206e4e46b44f9e51dad22bd1')
+    keystore = JsonKeyStore(None, file.name)
+    all_keys = await keystore.get_all()
+    assert len(all_keys) == 1
+    name, keys = all_keys[0]
+    assert name == '14:7D:DA:4E:53:A8/P'
+    assert keys.irk.value == bytes.fromhex('e7b2543b206e4e46b44f9e51dad22bd1')
 
 
 # -----------------------------------------------------------------------------