diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..add2efe
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,27 @@
+name: Tests
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  tests:
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 30
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        python: [3.9, 3.11]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Test
+        run: |
+          python3 -m pytest
diff --git a/.gitignore b/.gitignore
index 43ad15f..4a7886e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,7 @@ grasp2alm.egg-info/
 grasp2alm/__pycache__/
 dist/
 build/
+docs/_build/
+docs/_templates/
+test/__pycache__
+.pytest_cache/
diff --git a/poetry.lock b/poetry.lock
index d01b1a3..0a6c2d3 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -20,22 +20,12 @@ test = ["pytest (>=7.0)", "pytest-doctestplus (>=0.12)", "pytest-astropy-header
 test_all = ["pytest (>=7.0)", "pytest-doctestplus (>=0.12)", "pytest-astropy-header (>=0.2.1)", "pytest-astropy (>=0.10)", "pytest-xdist", "objgraph", "ipython (>=4.2)", "coverage", "skyfield (>=1.20)", "sgp4 (>=2.3)"]
 
 [[package]]
-name = "contourpy"
-version = "1.1.1"
-description = "Python library for calculating contours of 2D quadrilateral grids"
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
 category = "main"
 optional = false
-python-versions = ">=3.8"
-
-[package.dependencies]
-numpy = {version = ">=1.16,<2.0", markers = "python_version <= \"3.11\""}
-
-[package.extras]
-docs = ["furo", "sphinx (>=7.2)", "sphinx-copybutton"]
-bokeh = ["bokeh", "selenium"]
-mypy = ["contourpy", "docutils-stubs", "mypy (==1.4.1)", "types-pillow"]
-test = ["contourpy", "matplotlib", "pillow"]
-test-no-images = ["pytest", "pytest-cov", "wurlitzer"]
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 
 [[package]]
 name = "contourpy"
@@ -67,6 +57,17 @@ python-versions = ">=3.8"
 docs = ["ipython", "matplotlib", "numpydoc", "sphinx"]
 tests = ["pytest", "pytest-cov", "pytest-xdist"]
 
+[[package]]
+name = "exceptiongroup"
+version = "1.2.1"
+description = "Backport of PEP 654 (exception groups)"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+test = ["pytest (>=6)"]
+
 [[package]]
 name = "fonttools"
 version = "4.51.0"
@@ -121,6 +122,14 @@ zipp = {version = ">=3.1.0", markers = "python_version < \"3.10\""}
 docs = ["sphinx (>=3.5)", "sphinx (<7.2.5)", "jaraco.packaging (>=9.3)", "rst.linker (>=1.9)", "furo", "sphinx-lint", "jaraco.tidelift (>=1.4)"]
 testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=2.2)", "pytest-ruff (>=0.2.1)", "zipp (>=3.17)", "jaraco.test (>=5.4)", "pytest-mypy"]
 
+[[package]]
+name = "iniconfig"
+version = "2.0.0"
+description = "brain-dead simple config-ini parsing"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
 [[package]]
 name = "kiwisolver"
 version = "1.4.5"
@@ -181,6 +190,18 @@ tests = ["check-manifest", "coverage", "defusedxml", "markdown2", "olefile", "pa
 typing = ["typing-extensions"]
 xmp = ["defusedxml"]
 
+[[package]]
+name = "pluggy"
+version = "1.5.0"
+description = "plugin and hook calling mechanisms for python"
+category = "main"
+optional = false
+python-versions = ">=3.8"
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
+
 [[package]]
 name = "pyerfa"
 version = "2.0.0.3"
@@ -207,6 +228,25 @@ python-versions = ">=3.6.8"
 [package.extras]
 diagrams = ["railroad-diagrams", "jinja2"]
 
+[[package]]
+name = "pytest"
+version = "8.1.1"
+description = "pytest: simple powerful testing with Python"
+category = "main"
+optional = false
+python-versions = ">=3.8"
+
+[package.dependencies]
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=1.4,<2.0"
+tomli = {version = ">=1", markers = "python_version < \"3.11\""}
+
+[package.extras]
+testing = ["argcomplete", "attrs (>=19.2)", "hypothesis (>=3.56)", "mock", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
+
 [[package]]
 name = "python-dateutil"
 version = "2.9.0.post0"
@@ -250,6 +290,14 @@ category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 
+[[package]]
+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
 [[package]]
 name = "zipp"
 version = "3.18.1"
@@ -265,24 +313,30 @@ testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-ena
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.9,<3.13"
-content-hash = "f8a567f8b9faa7c148e0652cbd800c67390b5198d03b4ebff7b1d8993a77ccf8"
+content-hash = "2d3060b16b3396c1c3b7b50463b66d00822db10606466561592623e0aeaf3201"
 
 [metadata.files]
 astropy = []
+colorama = []
 contourpy = []
 cycler = []
+exceptiongroup = []
 fonttools = []
 healpy = []
 importlib-resources = []
+iniconfig = []
 kiwisolver = []
 matplotlib = []
 numpy = []
 packaging = []
 pillow = []
+pluggy = []
 pyerfa = []
 pyparsing = []
+pytest = []
 python-dateutil = []
 pyyaml = []
 scipy = []
 six = []
+tomli = []
 zipp = []
diff --git a/pyproject.toml b/pyproject.toml
index dc4045b..0ad7cc2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,6 +12,7 @@ numpy = "^1.23"
 healpy = "^1.15.0"
 matplotlib = "^3.1"
 scipy = "^1.13.0"
+pytest = "^8.1.1"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]
diff --git a/grasp2alm/test/beam_files/test.cut b/test/beam_files/test.cut
similarity index 100%
rename from grasp2alm/test/beam_files/test.cut
rename to test/beam_files/test.cut
diff --git a/grasp2alm/test/beam_files/test.grd b/test/beam_files/test.grd
similarity index 100%
rename from grasp2alm/test/beam_files/test.grd
rename to test/beam_files/test.grd
diff --git a/grasp2alm/test/test.py b/test/test_main.py
similarity index 62%
rename from grasp2alm/test/test.py
rename to test/test_main.py
index 034f40c..74d0b8b 100644
--- a/grasp2alm/test/test.py
+++ b/test/test_main.py
@@ -1,28 +1,31 @@
 # -*- encoding: utf-8 -*-
 
 import unittest
-import grasp2alm as gp
+from grasp2alm import BeamGrid, BeamCut, grasp2alm
 import numpy as np
+from pathlib import Path
 
 class TestGrasp2Alm(unittest.TestCase):
     def test_grasp2alm_with_gridfile(self):
-        file = "./beam_files/test.grd"
-        beam = gp.BeamGrid(file)
+        file = Path(__file__).parent / "beam_files" / "test.grd"
+        file = str(file)
+        beam = BeamGrid(file)
         polar = beam.to_polar()
         nside = 128
         beammap = polar.to_map(nside)
         blm1 = beammap.to_alm()
-        blm2 = gp.grasp2alm(file, nside)
+        blm2 = grasp2alm(file, nside)
         self.assertTrue(np.array_equal(blm1, blm2), "blm1 and blm2 are not equal")
 
     def test_grasp2alm_with_cutfile(self):
-        file = "./beam_files/test.cut"
-        beam = gp.BeamCut(file)
+        file = Path(__file__).parent / "beam_files" / "test.cut"
+        file = str(file)
+        beam = BeamCut(file)
         polar = beam.to_polar()
         nside = 128
         beammap = polar.to_map(nside)
         blm1 = beammap.to_alm()
-        blm2 = gp.grasp2alm(file, nside)
+        blm2 = grasp2alm(file, nside)
         self.assertTrue(np.array_equal(blm1, blm2), "blm1 and blm2 are not equal")