diff --git a/.github/workflows/python-tox.yaml b/.github/workflows/python-tox.yaml
index 1d3d11f..785a3aa 100644
--- a/.github/workflows/python-tox.yaml
+++ b/.github/workflows/python-tox.yaml
@@ -39,4 +39,4 @@ jobs:
           pip install tox tox-gh-actions
 
       - name: Test with tox and upload coverage results
-        run: tox -- --codecov --codecov-token=${{ secrets.CODECOV_TOKEN }}
+        run: tox -- --codecov --codecov-token=${{ secrets.CODECOV_TOKEN }} --junit-xml=junit.xml -o junit_family=legacy
diff --git a/pyproject.toml b/pyproject.toml
index 1f79b62..87bed06 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -83,11 +83,14 @@ legacy_tox_ini = """
     [testenv]
     setenv =
         py{38,39,310,311,312,313}: COVERAGE_FILE = .coverage.{envname}
-    commands = pytest --cov --cov-report= {posargs:tests}
+    commands =
+        pytest --cov --cov-report= {posargs:tests}
+        pytest -n2 --cov --cov-report= {posargs:tests}
     deps =
         pytest
         coverage
         pytest-cov
+        pytest-xdist
         .
         GitPython
 
diff --git a/src/pytest_codecov/__init__.py b/src/pytest_codecov/__init__.py
index e84a826..8e6eeb5 100644
--- a/src/pytest_codecov/__init__.py
+++ b/src/pytest_codecov/__init__.py
@@ -85,18 +85,26 @@ def pytest_addoption(parser, pluginmanager):
         default=True,
         help='Don\'t upload coverage results on test failure'
     )
+    group.addoption(
+        '--codecov-exclude-junit-xml',
+        action='store_false',
+        dest='codecov_junit_xml',
+        default=True,
+        help='Don\'t upload the junit xml file'
+    )
 
 
 class CodecovPlugin:
 
     def upload_report(self, terminalreporter, config, cov):
+        option = config.option
         uploader = codecov.CodecovUploader(
-            config.option.codecov_slug,
-            commit=config.option.codecov_commit,
-            branch=config.option.codecov_branch,
-            token=config.option.codecov_token,
+            option.codecov_slug,
+            commit=option.codecov_commit,
+            branch=option.codecov_branch,
+            token=option.codecov_token,
         )
-        uploader.write_network_files(git.ls_files())
+        uploader.add_network_files(git.ls_files())
         from coverage.misc import CoverageException
         try:
             uploader.add_coverage_report(cov)
@@ -110,14 +118,21 @@ def upload_report(self, terminalreporter, config, cov):
             terminalreporter.line('')
             return
 
-        if config.option.codecov_dump:
+        xmlpath = option.xmlpath if option.codecov_junit_xml else None
+        if xmlpath and os.path.isfile(xmlpath):
+            uploader.add_junit_xml(xmlpath)
+            has_junit_xml = True
+        else:
+            has_junit_xml = False
+
+        if option.codecov_dump:
             terminalreporter.section('Prepared Codecov.io payload')
             terminalreporter.write_line(uploader.get_payload())
             return
 
         terminalreporter.section('Codecov.io upload')
 
-        if not config.option.codecov_slug:
+        if not option.codecov_slug:
             terminalreporter.write_line(
                 'ERROR: Failed to determine git repository slug. '
                 'Cannot upload without a valid slug.',
@@ -126,24 +141,35 @@ def upload_report(self, terminalreporter, config, cov):
             )
             terminalreporter.line('')
             return
-        if not config.option.codecov_branch:
+        if not option.codecov_branch:
             terminalreporter.write_line(
                 'WARNING: Failed to determine git repository branch.',
                 yellow=True,
                 bold=True,
             )
-        if not config.option.codecov_commit:
+        if not option.codecov_commit:
             terminalreporter.write_line(
                 'WARNING: Failed to determine git commit.',
                 yellow=True,
                 bold=True,
             )
+        if has_junit_xml and config.getini('junit_family') != 'legacy':
+            terminalreporter.write_line(
+                'INFO: We recommend using junit_family=legacy with Codecov.',
+                blue=True,
+                bold=True,
+            )
+
         terminalreporter.write_line(
             'Environment:\n'
-            f'Slug:   {config.option.codecov_slug}\n'
-            f'Branch: {config.option.codecov_branch}\n'
-            f'Commit: {config.option.codecov_commit}\n'
+            f'Slug:   {option.codecov_slug}\n'
+            f'Branch: {option.codecov_branch}\n'
+            f'Commit: {option.codecov_commit}\n'
         )
+        if has_junit_xml:
+            terminalreporter.write_line(
+                'JUnit XML file detected and included in upload.\n'
+            )
         try:
             terminalreporter.write_line('Pinging codecov API...')
             uploader.ping()
@@ -178,6 +204,10 @@ def pytest_terminal_summary(self, terminalreporter, exitstatus, config):
 
 
 def pytest_configure(config):  # pragma: no cover
+    # NOTE: Don't report codecov results on worker nodes
+    if hasattr(config, 'workerinput'):
+        return
+
     # NOTE: if cov is missing we fail silently
     if config.option.codecov and config.pluginmanager.has_plugin('_cov'):
         config.pluginmanager.register(CodecovPlugin())
diff --git a/src/pytest_codecov/codecov.py b/src/pytest_codecov/codecov.py
index e5e3732..95bdb84 100644
--- a/src/pytest_codecov/codecov.py
+++ b/src/pytest_codecov/codecov.py
@@ -1,7 +1,10 @@
 import gzip
 import io
+import json
 import requests
 import tempfile
+import zlib
+from base64 import b64encode
 from urllib.parse import urljoin
 
 
@@ -23,25 +26,38 @@ def __init__(self, slug, commit=None, branch=None, token=None):
         self.commit = commit
         self.branch = branch
         self.token = token
-        self.store_url = None
-        self._buffer = io.StringIO()
+        self._coverage_store_url = None
+        self._coverage_buffer = io.StringIO()
+        self._test_result_store_url = None
+        self._test_result_files = []
 
-    def write_network_files(self, files):
-        self._buffer.write(
+    def add_network_files(self, files):
+        self._coverage_buffer.write(
             '\n'.join(files + ['<<<<<< network'])
         )
 
     def add_coverage_report(self, cov, filename='coverage.xml', **kwargs):
         with tempfile.NamedTemporaryFile(mode='r') as xml_report:
             # embed xml report
-            self._buffer.write(f'\n# path=./{filename}\n')
+            self._coverage_buffer.write(f'\n# path=./{filename}\n')
             cov.xml_report(outfile=xml_report.name)
             xml_report.seek(0)
-            self._buffer.write(xml_report.read())
-            self._buffer.write('\n<<<<<< EOF')
+            self._coverage_buffer.write(xml_report.read())
+            self._coverage_buffer.write('\n<<<<<< EOF')
+
+    def add_junit_xml(self, path, filename='junit.xml'):
+        with open(path, 'rb') as junit_xml:
+            self._test_result_files.append({
+                'filename': filename,
+                'format': 'base64+compressed',
+                'data': b64encode(
+                    zlib.compress(junit_xml.read())
+                ).decode('ascii'),
+                'labels': '',
+            })
 
     def get_payload(self):
-        return self._buffer.getvalue()
+        return self._coverage_buffer.getvalue()
 
     def ping(self):
         if not self.slug:
@@ -77,10 +93,30 @@ def ping(self):
             raise CodecovError(
                 f'Invalid response from codecov API:\n{response.text}'
             )
-        self.store_url = lines[1]
+        self._coverage_store_url = lines[1]
+
+        if not self._test_result_files:
+            return
+
+        headers = {} if self.token is None else {
+            'Authorization': f'token {self.token}',
+            'User-Agent': package()
+        }
+        data = {
+            'slug': self.slug,
+            'branch': self.branch or '',
+            'commit': self.commit or '',
+        }
+        api_url = urljoin(self.api_endpoint, '/upload/test_results/v1')
+        response = requests.post(api_url, headers=headers, json=data)
+        if response.ok:
+            # TODO: Fail more loudly?
+            url = response.json()['raw_upload_location']
+            if url.startswith(self.storage_endpoint):
+                self._test_result_store_url = url
 
     def upload(self):
-        if not self.store_url:
+        if not self._coverage_store_url:
             raise CodecovError('Need to ping API before upload.')
 
         headers = {
@@ -92,10 +128,20 @@ def upload(self):
             payload.write(self.get_payload().encode('utf-8'))
         gz_payload.seek(0)
         response = requests.put(
-            self.store_url, headers=headers, data=gz_payload
+            self._coverage_store_url, headers=headers, data=gz_payload
         )
 
         if not response.ok:
             raise CodecovError('Failed to upload report to storage endpoint.')
 
-        self.store_url = None  # NOTE: Invalidate store url after upload
+        self._coverage_store_url = None
+
+        if not self._test_result_store_url or not self._test_result_files:
+            return
+
+        json_payload = json.dumps({
+            'test_results_files': self._test_result_files
+        }).encode('ascii')
+        # TODO: Fail more loudly?
+        requests.put(self._test_result_store_url, data=json_payload)
+        self._test_result_store_url = None
diff --git a/tests/conftest.py b/tests/conftest.py
index 1c3eb63..800b642 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,11 +1,13 @@
+import importlib
+import json
+
+from coverage.misc import CoverageException
 import pytest
+
 import pytest_codecov
 import pytest_codecov.codecov
 import pytest_codecov.git
 
-from coverage.misc import CoverageException
-from importlib import reload
-
 pytest_plugins = 'pytester'
 
 
@@ -71,6 +73,9 @@ def __init__(self, text='', ok=True):
         self.text = text
         self.ok = ok
 
+    def json(self):
+        return json.loads(self.text)
+
 
 class MockRequests:
 
@@ -82,6 +87,10 @@ def __init__(self) -> None:
     def set_response(self, text, ok=True):
         self._response = MockResponse(text, ok=ok)
 
+    def set_responses(self, *texts):
+        assert texts
+        self._response = [MockResponse(text) for text in texts]
+
     def pop(self):
         calls = self._calls
         self.clear()
@@ -95,6 +104,12 @@ def mock_method(self, method, url, **kwargs):
             raise ConnectionError()
 
         self._calls.append((method.lower(), url, kwargs))
+        if isinstance(self._response, list):
+            response = self._response.pop(0)
+            if not self._response:
+                # repeat the final response indefinitely
+                self._response = response
+            return response
         return self._response
 
 
@@ -113,16 +128,19 @@ class DummyUploader:
     # TODO: Implement some basic behavior, so we can test
     #       more exhaustively.
 
-    def __init__(self, slug, **kwargs):
-        self.fail_report_generation = False
+    def __init__(self, factory, slug, **kwargs):
+        self.factory = factory
 
-    def write_network_files(self, files):
+    def add_network_files(self, files):
         pass
 
     def add_coverage_report(self, cov, **kwargs):
-        if self.fail_report_generation:
+        if self.factory.fail_report_generation:
             raise CoverageException('test exception')
 
+    def add_junit_xml(self, path):
+        self.factory.junit_xml = path
+
     def get_payload(self):
         return 'stub'
 
@@ -135,12 +153,15 @@ def upload(self):
 
 class DummyUploaderFactory:
 
-    fail_report_generation = False
+    def __init__(self):
+        self.fail_report_generation = False
+        self.junit_xml = None
 
     def __call__(self, slug, **kwargs):
-        inst = DummyUploader(slug, **kwargs)
-        inst.fail_report_generation = self.fail_report_generation
-        return inst
+        return DummyUploader(self, slug, **kwargs)
+
+    def clear(self):
+        self.junit_xml = None
 
 
 @pytest.fixture
@@ -156,5 +177,5 @@ def dummy_uploader(monkeypatch):
 # NOTE: Ensure modules are reloaded when coverage.py is looking.
 #       This means we want to avoid importing module members when
 #       using these modules, to ensure they get reloaded as well.
-reload(pytest_codecov)
-reload(pytest_codecov.codecov)
+importlib.reload(pytest_codecov)
+importlib.reload(pytest_codecov.codecov)
diff --git a/tests/test_codecov.py b/tests/test_codecov.py
index 53348b9..1c3e293 100644
--- a/tests/test_codecov.py
+++ b/tests/test_codecov.py
@@ -15,7 +15,7 @@ def test_init():
 
 def test_write_network_files():
     uploader = CodecovUploader('seantis/pytest-codecov')
-    uploader.write_network_files(['foo.py'])
+    uploader.add_network_files(['foo.py'])
     assert uploader.get_payload() == (
         'foo.py\n'
         '<<<<<< network'
@@ -24,7 +24,7 @@ def test_write_network_files():
 
 def test_add_coverage_report(dummy_cov):
     uploader = CodecovUploader('seantis/pytest-codecov')
-    uploader.write_network_files(['foo.py'])
+    uploader.add_network_files(['foo.py'])
     uploader.add_coverage_report(dummy_cov)
     assert uploader.get_payload() == (
         'foo.py\n'
@@ -55,11 +55,27 @@ def test_ping(dummy_cov, mock_requests):
 
     mock_requests.set_response(f'codecov.io\n{uploader.storage_endpoint}')
     uploader.ping()
-    assert uploader.store_url == uploader.storage_endpoint
+    assert uploader._coverage_store_url == uploader.storage_endpoint
+    assert uploader._test_result_store_url is None
 
     # TODO: Verify correct url/headers/params
 
 
+def test_ping_junit(dummy_cov, mock_requests, tmp_path):
+    junit_xml = tmp_path / 'junit.xml'
+    junit_xml.write_text('foo')
+    uploader = CodecovUploader('seantis/pytest-codecov')
+    uploader.add_junit_xml(str(junit_xml))
+
+    mock_requests.set_responses(
+        f'codecov.io\n{uploader.storage_endpoint}',
+        f'{{"raw_upload_location":"{uploader.storage_endpoint}"}}'
+    )
+    uploader.ping()
+    assert uploader._coverage_store_url == uploader.storage_endpoint
+    assert uploader._test_result_store_url == uploader.storage_endpoint
+
+
 def test_ping_no_slug(dummy_cov, mock_requests):
     uploader = CodecovUploader(None)
     with pytest.raises(CodecovError, match=r'valid slug'):
@@ -80,6 +96,27 @@ def test_upload(dummy_cov, mock_requests):
 
     mock_requests.set_response('')
     uploader.upload()
-    assert uploader.store_url is None
+    assert uploader._coverage_store_url is None
+    assert uploader._test_result_store_url is None
+
+    # TODO: Verify correct url/headers/params
+
+
+def test_upload_junit(dummy_cov, mock_requests, tmp_path):
+    junit_xml = tmp_path / 'junit.xml'
+    junit_xml.write_text('foo')
+    uploader = CodecovUploader('seantis/pytest-codecov')
+    uploader.add_junit_xml(str(junit_xml))
+
+    mock_requests.set_responses(
+        f'codecov.io\n{uploader.storage_endpoint}',
+        f'{{"raw_upload_location":"{uploader.storage_endpoint}"}}'
+    )
+    uploader.ping()
+
+    mock_requests.set_response('')
+    uploader.upload()
+    assert uploader._coverage_store_url is None
+    assert uploader._test_result_store_url is None
 
     # TODO: Verify correct url/headers/params
diff --git a/tests/test_plugin.py b/tests/test_plugin.py
index 291fa91..40c9cb4 100644
--- a/tests/test_plugin.py
+++ b/tests/test_plugin.py
@@ -113,6 +113,98 @@ def test_upload_report(pytester, dummy_reporter, dummy_uploader,
     ) in dummy_reporter.text
 
 
+def test_upload_report_junit(pytester, dummy_reporter, dummy_uploader,
+                             dummy_cov, no_gitpython, tmp_path):
+
+    # create a junit xml
+    junit_xml = tmp_path / 'junit.xml'
+    junit_xml.write_text('foo')
+    config = pytester.parseconfig(
+        f'--junit-xml={junit_xml}',
+        '-o',
+        'junit_family=legacy',
+        '--codecov',
+        '--codecov-token=12345678-1234-1234-1234-1234567890ab',
+        '--codecov-slug=foo/bar',
+        '--codecov-branch=master',
+        '--codecov-commit=deadbeef'
+    )
+    plugin = CodecovPlugin()
+    plugin.upload_report(dummy_reporter, config, dummy_cov)
+    assert (
+        'Environment:\n'
+        'Slug:   foo/bar\n'
+        'Branch: master\n'
+        'Commit: deadbeef\n'
+        '\n'
+        'JUnit XML file detected and included in upload.\n'
+    ) in dummy_reporter.text
+    assert (
+        'INFO: We recommend using junit_family=legacy with Codecov.'
+    ) not in dummy_reporter.text
+    assert dummy_uploader.junit_xml == str(junit_xml)
+
+
+def test_upload_report_junit_info(pytester, dummy_reporter, dummy_uploader,
+                                  dummy_cov, no_gitpython, tmp_path):
+
+    # create a junit xml
+    junit_xml = tmp_path / 'junit.xml'
+    junit_xml.write_text('foo')
+    config = pytester.parseconfig(
+        f'--junit-xml={junit_xml}',
+        '--codecov',
+        '--codecov-token=12345678-1234-1234-1234-1234567890ab',
+        '--codecov-slug=foo/bar',
+        '--codecov-branch=master',
+        '--codecov-commit=deadbeef'
+    )
+    plugin = CodecovPlugin()
+    plugin.upload_report(dummy_reporter, config, dummy_cov)
+    assert (
+        'INFO: We recommend using junit_family=legacy with Codecov.\n'
+        'Environment:\n'
+        'Slug:   foo/bar\n'
+        'Branch: master\n'
+        'Commit: deadbeef\n'
+        '\n'
+        'JUnit XML file detected and included in upload.\n'
+    ) in dummy_reporter.text
+    assert dummy_uploader.junit_xml == str(junit_xml)
+
+
+def test_no_upload_report_junit(pytester, dummy_reporter, dummy_uploader,
+                                dummy_cov, no_gitpython, tmp_path):
+
+    # create a junit xml
+    junit_xml = tmp_path / 'junit.xml'
+    junit_xml.write_text('foo')
+    config = pytester.parseconfig(
+        f'--junit-xml={junit_xml}',
+        '--codecov',
+        '--codecov-token=12345678-1234-1234-1234-1234567890ab',
+        '--codecov-slug=foo/bar',
+        '--codecov-branch=master',
+        '--codecov-commit=deadbeef',
+        '--codecov-exclude-junit-xml'
+    )
+    plugin = CodecovPlugin()
+    plugin.upload_report(dummy_reporter, config, dummy_cov)
+    assert (
+        'Environment:\n'
+        'Slug:   foo/bar\n'
+        'Branch: master\n'
+        'Commit: deadbeef\n'
+    ) in dummy_reporter.text
+    assert (
+        'JUnit XML file detected and included in upload.'
+    ) not in dummy_reporter.text
+    assert (
+        'INFO: We recommend using junit_family=legacy with Codecov.'
+    ) not in dummy_reporter.text
+    assert dummy_uploader.junit_xml is None
+
+
 def test_upload_report_generation_failure(
     pytester, dummy_reporter, dummy_uploader,
     dummy_cov, no_gitpython