diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
new file mode 100644
index 0000000..b5c2cfb
--- /dev/null
+++ b/.github/workflows/build-test.yml
@@ -0,0 +1,62 @@
+name: install-test
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - '*'
+  pull_request:
+    branches:
+      - master
+  schedule:
+    # 7am EST / 8am EDT Mondays
+    - cron: '0 12 * * 1'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.7, 3.8, 3.9, 3.10]
+        install: [repo]
+        pip-flags: ['', '--pre']
+        include:
+          - python-version: 3.9
+            install: sdist
+            pip-flags: ''
+          - python-version: 3.9
+            install: wheel
+            pip-flags: ''
+          - python-version: 3.9
+            install: editable
+            pip-flags: ''
+
+    env:
+      INSTALL_TYPE: ${{ matrix.install }}
+      PIP_FLAGS: ${{ matrix.pip-flags }}
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Select archive
+      run: |
+        if [ "$INSTALL_TYPE" = "sdist" ]; then
+          ARCHIVE=$( ls dist/*.tar.gz )
+        elif [ "$INSTALL_TYPE" = "wheel" ]; then
+          ARCHIVE=$( ls dist/*.whl )
+        elif [ "$INSTALL_TYPE" = "repo" ]; then
+          ARCHIVE="."
+        elif [ "$INSTALL_TYPE" = "editable" ]; then
+          ARCHIVE="-e ."
+        fi
+        echo "ARCHIVE=$ARCHIVE" >> $GITHUB_ENV
+    - name: Install package and test dependencies
+      run: python -m pip install $PIP_FLAGS $ARCHIVE[test]
+    - name: Run tests
+      run: python -m pytest -sv --doctest-modules etelemetry
diff --git a/etelemetry/config.py b/etelemetry/config.py
index 99d2883..1379e69 100644
--- a/etelemetry/config.py
+++ b/etelemetry/config.py
@@ -7,7 +7,7 @@
 
 
 DEFAULT_ENDPOINT = "http://0.0.0.0:8000/graphql"  # localhost test
-CONFIG_FILENAME = Path.home() / '.cache' / 'etelemetry' / 'config.json'
+DEFAULT_CONFIG_FILE = Path.home() / '.cache' / 'etelemetry' / 'config.json'
 
 # TODO: 3.10 - Replace with | operator
 File = typing.Union[str, Path]
@@ -15,23 +15,69 @@
 
 @dataclass
 class Config:
+    """
+    Class to store client-side configuration, facilitating communication with the server.
+
+    The class stores the following components:
+    - `endpoint`:
+    The URL of the etelemetry server
+    - `user_id`:
+    A string representation of a UUID (RFC 4122) assigned to the user.
+    - `session_id`:
+    A string representation of a UUID assigned to the lifespan of the etelemetry invocation.
+    """
     endpoint: str = None
-    user_id: uuid.UUID = None
+    user_id: str = None
+    session_id: str = None
     _is_setup = False
 
-
-def load(filename: File = CONFIG_FILENAME) -> bool:
+    @classmethod
+    def init(
+        cls,
+        *,
+        endpoint: str = None,
+        user_id: str = None,
+        session_id: str = None,
+        final: bool = True,
+    ) -> None:
+        if cls._is_setup:
+            return
+        if endpoint is not None:
+            cls.endpoint = endpoint
+        elif cls.endpoint is None:
+            cls.endpoint = DEFAULT_ENDPOINT
+        if user_id is not None or cls.user_id is None:
+            try:
+                uuid.UUID(user_id)
+                cls.user_id = user_id
+            except Exception:
+                cls.user_id = gen_uuid()
+        # Do not set automatically, leave to developers
+        if session_id is not None:
+            try:
+                uuid.UUID(session_id)
+                cls.session_id = session_id
+            except Exception:
+                pass
+        cls._is_setup = final
+
+
+    @classmethod
+    def _reset(cls):
+        cls.endpoint = None
+        cls.user_id = None
+        cls.session_id = None
+        cls._is_setup = False
+
+
+def load(filename: File) -> bool:
     """Load existing configuration file, or create a new one."""
     config = json.loads(Path(filename).read_text())
-    Config.endpoint = config.get("endpoint")
-    user_id = config.get("user_id")
-    if user_id:
-        Config.user_id = uuid.UUID(user_id)
-    Config._is_setup = True
+    Config.init(final=False, **config)
     return True
 
 
-def save(filename: File = CONFIG_FILENAME) -> str:
+def save(filename: File) -> str:
     """Save to a file."""
     config = {
         field: getattr(Config, field) for field in Config.__annotations__.keys()
@@ -42,23 +88,36 @@ def save(filename: File = CONFIG_FILENAME) -> str:
     return str(filename)
 
 
-def setup(et_endpoint: str = None, user_id: uuid.UUID = None, filename: File = CONFIG_FILENAME):
-    """Configure the client, and save configuration to an output file."""
+def setup(
+    *,
+    endpoint: str = None,
+    user_id: str = None,
+    session_id: str = None,
+    save_config: bool = True,
+    filename: File = None,
+) -> None:
+    """
+    Configure the client, and save configuration to an output file.
+
+    This method is invoked before each API call, but can also be called by
+    application developers for finer-grain control.
+    """
     if Config._is_setup:
         return
+    filename = filename or DEFAULT_CONFIG_FILE
     if Path(filename).exists():
-        return load(filename)
-    Config.endpoint = et_endpoint or DEFAULT_ENDPOINT
-    Config.user_id = user_id or gen_user_uuid()
-    Config._is_setup = True
-    save(filename)
+        load(filename)
+    # if any parameters have been set, override the current attribute
+    Config.init(endpoint=endpoint, user_id=user_id, session_id=session_id)
+    if save_config:
+        save(filename)
 
 
-def gen_user_uuid(uuid_factory: str = "safe") -> uuid.UUID:
+def gen_uuid(uuid_factory: str = "safe") -> str:
     """
-    Generate a user ID in UUID format.
+    Generate a RFC 4122 UUID.
 
-    Depending on what `uuid_factory` is provided, the user ID will be generated differently:
+    Depending on what `uuid_factory` is provided, the UUID will be generated differently:
     - `safe`: This is multiprocessing safe, and uses system information.
     - `random`: This is random, and may run into problems if setup is called across multiple
     processes.
@@ -70,12 +129,12 @@ def gen_user_uuid(uuid_factory: str = "safe") -> uuid.UUID:
     # TODO: 3.10 - Replace with match/case
     if uuid_factory == "safe":
         return _safe_uuid_factory()
-    if uuid_factory == "random":
-        return uuid.uuid4()
+    elif uuid_factory == "random":
+        return str(uuid.uuid4())
     raise NotImplementedError
 
 
-def _safe_uuid_factory() -> uuid.UUID:
+def _safe_uuid_factory() -> str:
     import getpass
     import socket
 
diff --git a/etelemetry/tests/__init__.py b/etelemetry/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/etelemetry/tests/test_config.py b/etelemetry/tests/test_config.py
new file mode 100644
index 0000000..afc4541
--- /dev/null
+++ b/etelemetry/tests/test_config.py
@@ -0,0 +1,37 @@
+import uuid
+
+import pytest
+
+from .. import config
+
+
+@pytest.fixture(autouse=True)
+def tmp_config(tmp_path, monkeypatch):
+    home = tmp_path / 'config.json'
+    monkeypatch.setattr(config, 'DEFAULT_CONFIG_FILE', home)
+
+
+def test_setup_default():
+
+    conf = config.Config
+    assert conf.endpoint is None
+    assert conf.user_id is None
+    assert conf.session_id is None
+    assert conf._is_setup is False
+
+    config.setup()
+    assert conf.endpoint == config.DEFAULT_ENDPOINT
+    assert uuid.UUID(conf.user_id)
+    assert conf.session_id is None
+    assert conf._is_setup is True
+
+    # after being set up, cannot be overriden
+    new_endpoint = 'https://github.com'
+    config.setup(endpoint=new_endpoint)
+    assert conf.endpoint == config.DEFAULT_ENDPOINT
+
+    # but fine if cleared
+    conf._reset()
+    assert conf.endpoint is None
+    config.setup(endpoint=new_endpoint)
+    assert conf.endpoint == new_endpoint
diff --git a/setup.cfg b/setup.cfg
index 264665c..4d8b825 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -21,6 +21,10 @@ install_requires =
     ci-info >= 0.2
     typing_extensions; python_version<'3.8'
 
+[options.extras_require]
+test =
+    pytest
+
 [flake8]
 max-line-length = 99