diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..ad4ccd3
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,29 @@
+name: Build and test
+on:
+  push:
+    branches: [ 'main' ]
+
+  pull_request:
+    branches: [ 'main' ]
+
+# This allows a subsequently queued workflow run to interrupt and cancel previous runs
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  Run-tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python: [ '3.8', '3.9', '3.10', '3.11' ]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v3
+        with:
+          python-version: '${{ matrix.python }}'
+          architecture: 'x64'
+      - run: pip install -U pip wheel poetry
+      - run: poetry install --with dev
+      - run: poetry run pytest tests
diff --git a/airflowctl/cli.py b/airflowctl/cli.py
index cba5395..6947586 100644
--- a/airflowctl/cli.py
+++ b/airflowctl/cli.py
@@ -74,8 +74,7 @@ def init(
 def build(
     project_path: Path = typer.Argument(Path.cwd(), help="Absolute path to the Airflow project directory."),
     settings_file: Path = typer.Option(
-        Path.cwd() / SETTINGS_FILENAME,
-        help="Path to the settings file.",
+        None, help="Path to the settings file. Defaults to PROJECT_DIR/settings.yaml.", show_default=False
     ),
     venv_path: Path = typer.Option(
         Path.cwd() / ".venv",
@@ -93,9 +92,12 @@ def build(
 
     airflowctl_project_check(project_path)
     project_path = Path(project_path).absolute()
+
+    if not settings_file:
+        settings_file = project_path / SETTINGS_FILENAME
     settings_file = Path(settings_file).absolute()
 
-    if not Path(project_path / SETTINGS_FILENAME).exists():
+    if not settings_file.exists():
         typer.echo(f"Settings file '{settings_file}' not found.")
         raise typer.Exit(1)
 
@@ -412,7 +414,7 @@ def print_next_steps(venv_path: str | Path, version: str):
 
     next_steps = "Next Steps:"
 
-    activate_command = f"$ source {venv_path}/bin/activate"
+    activate_command = activate_virtualenv_cmd(venv_path)
 
     assert Path(venv_path).exists()
 
diff --git a/airflowctl/utils/virtualenv.py b/airflowctl/utils/virtualenv.py
index d99148d..49725b3 100644
--- a/airflowctl/utils/virtualenv.py
+++ b/airflowctl/utils/virtualenv.py
@@ -69,7 +69,7 @@ def verify_or_create_venv(venv_path: str | Path, recreate: bool, python_version:
 def activate_virtualenv_cmd(venv_path: str | Path) -> str:
     if os.name == "posix":
         bin_path = os.path.join(venv_path, "bin", "activate")
-        activate_cmd = f"source {bin_path}"
+        activate_cmd = f". {bin_path}"
     elif os.name == "nt":
         bin_path = os.path.join(venv_path, "Scripts", "activate")
         activate_cmd = f"call {bin_path}"
diff --git a/poetry.lock b/poetry.lock
index 3706fc1..5bde19c 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -162,6 +162,17 @@ docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker
 perf = ["ipython"]
 testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-mypy (>=0.9.1)", "pytest-perf (>=0.9.2)", "pytest-ruff"]
 
+[[package]]
+name = "iniconfig"
+version = "2.0.0"
+description = "brain-dead simple config-ini parsing"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"},
+    {file = "iniconfig-2.0.0.tar.gz", hash = "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3"},
+]
+
 [[package]]
 name = "markdown-it-py"
 version = "2.2.0"
@@ -198,6 +209,35 @@ files = [
     {file = "mdurl-0.1.2.tar.gz", hash = "sha256:bb413d29f5eea38f31dd4754dd7377d4465116fb207585f97bf925588687c1ba"},
 ]
 
+[[package]]
+name = "packaging"
+version = "23.1"
+description = "Core utilities for Python packages"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "packaging-23.1-py3-none-any.whl", hash = "sha256:994793af429502c4ea2ebf6bf664629d07c1a9fe974af92966e4b8d2df7edc61"},
+    {file = "packaging-23.1.tar.gz", hash = "sha256:a392980d2b6cffa644431898be54b0045151319d1e7ec34f0cfed48767dd334f"},
+]
+
+[[package]]
+name = "pluggy"
+version = "1.2.0"
+description = "plugin and hook calling mechanisms for python"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "pluggy-1.2.0-py3-none-any.whl", hash = "sha256:c2fd55a7d7a3863cba1a013e4e2414658b1d07b6bc57b3919e0c63c9abb99849"},
+    {file = "pluggy-1.2.0.tar.gz", hash = "sha256:d12f0c4b579b15f5e054301bb226ee85eeeba08ffec228092f8defbaa3a4c4b3"},
+]
+
+[package.dependencies]
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
+
 [[package]]
 name = "psutil"
 version = "5.9.5"
@@ -238,6 +278,29 @@ files = [
 [package.extras]
 plugins = ["importlib-metadata"]
 
+[[package]]
+name = "pytest"
+version = "7.4.0"
+description = "pytest: simple powerful testing with Python"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "pytest-7.4.0-py3-none-any.whl", hash = "sha256:78bf16451a2eb8c7a2ea98e32dc119fd2aa758f1d5d66dbf0a59d69a3969df32"},
+    {file = "pytest-7.4.0.tar.gz", hash = "sha256:b4bf8c45bd59934ed84001ad51e11b4ee40d40a1229d2c79f9c592b0a3f6bd8a"},
+]
+
+[package.dependencies]
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
+
+[package.extras]
+testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
+
 [[package]]
 name = "python-dotenv"
 version = "0.21.1"
@@ -356,6 +419,17 @@ files = [
     {file = "sniffio-1.3.0.tar.gz", hash = "sha256:e60305c5e5d314f5389259b7f22aaa33d8f7dee49763119234af3755c55b9101"},
 ]
 
+[[package]]
+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
+    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
+]
+
 [[package]]
 name = "typer"
 version = "0.9.0"
@@ -409,4 +483,4 @@ testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.7"
-content-hash = "5489348a9dda8a0b909056a414dcc74be7d8049410a82b2e725e0f3ea2cef205"
+content-hash = "92e8f317c8c31b7839e3572f107bd6d7aca39351250be6443512d01854fc221a"
diff --git a/pyproject.toml b/pyproject.toml
index 1cd59e2..6c975e7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,6 +37,9 @@ psutil = "^5.9.5"
 [tool.poetry.scripts]
 airflowctl = "airflowctl.cli:app"
 
+[tool.poetry.group.dev.dependencies]
+pytest = "^7.4.0"
+
 [build-system]
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..593e964
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,58 @@
+import tempfile
+
+import pytest
+from typer.testing import CliRunner
+
+from airflowctl.cli import app
+
+runner = CliRunner()
+
+
+@pytest.fixture(scope="function")
+def temp_project_dir():
+    with tempfile.TemporaryDirectory() as temp_dir:
+        yield temp_dir
+
+
+def test_init_command(temp_project_dir):
+    result = runner.invoke(
+        app,
+        [
+            "init",
+            temp_project_dir,
+            "--project-name",
+            "my_project",
+            "--airflow-version",
+            "2.6.3",
+            "--build-start",
+            "--background",
+        ],
+    )
+
+    assert result.exit_code == 0, result.output
+    assert "Airflow project built successfully." in result.output
+
+
+def test_build_command(temp_project_dir):
+    result = runner.invoke(
+        app,
+        [
+            "init",
+            temp_project_dir,
+            "--project-name",
+            "my_project",
+        ],
+    )
+
+    assert result.exit_code == 0, result.output
+    result_1 = runner.invoke(
+        app,
+        [
+            "build",
+            temp_project_dir,
+            # "--recreate-venv"
+        ],
+    )
+
+    assert result_1.exit_code == 0, result_1.output
+    assert "Airflow project built successfully." in result_1.output