diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e9a471c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,112 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+
+# version file
+**_version.py
+
+# Input/Output files
+*.bp
+*.xdmf
+*.h5
\ No newline at end of file
diff --git a/src/hisp/__init__.py b/src/hisp/__init__.py
new file mode 100644
index 0000000..e7c053e
--- /dev/null
+++ b/src/hisp/__init__.py
@@ -0,0 +1 @@
+from .helpers import PulsedSource, Scenario
diff --git a/helpers.py b/src/hisp/helpers.py
similarity index 100%
rename from helpers.py
rename to src/hisp/helpers.py
diff --git a/scenario_test.txt b/test/scenario_test.txt
similarity index 100%
rename from scenario_test.txt
rename to test/scenario_test.txt
diff --git a/test/test_scenario.py b/test/test_scenario.py
new file mode 100644
index 0000000..7fdc624
--- /dev/null
+++ b/test/test_scenario.py
@@ -0,0 +1,27 @@
+from hisp.helpers import Scenario
+import os
+import pytest
+
+current_dir = os.path.dirname(__file__)
+scenario_path = os.path.join(current_dir, "scenario_test.txt")
+
+
+def test_maximum_time():
+    # BUILD
+    my_scenario = Scenario(scenario_path)
+    expected_maximum_time = 2 * (455 + 455 + 650 + 1000) + 2 * (36 + 36 + 180 + 1000)
+
+    # RUN
+    computed_maximum_time = my_scenario.get_maximum_time()
+
+    # TEST
+    assert computed_maximum_time == expected_maximum_time
+
+
+@pytest.mark.parametrize("t, expected_row", [(0, 0), (6000, 1)])
+def test_get_pulse_row(t, expected_row):
+    my_scenario = Scenario(scenario_path)
+
+    pulse_row = my_scenario.get_row(t=t)
+
+    assert pulse_row == expected_row