diff --git a/.github/workflows/python-lint.yml b/.github/workflows/python-lint.yml
index b667148..13e9057 100644
--- a/.github/workflows/python-lint.yml
+++ b/.github/workflows/python-lint.yml
@@ -1,7 +1,7 @@
 name: python lint
 on: [push]
 jobs:
-  sdk-python-lint:
+  python-lint:
     runs-on: ubuntu-latest
     steps:
       - name: git clone
diff --git a/.github/workflows/python-test.yml b/.github/workflows/python-test.yml
new file mode 100644
index 0000000..192496e
--- /dev/null
+++ b/.github/workflows/python-test.yml
@@ -0,0 +1,21 @@
+name: python test
+on: [push]
+jobs:
+  python-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: git clone
+        uses: actions/checkout@v3
+
+      - name: set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.12"
+
+      - name: install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+
+      - name: unit tests
+        run: python -m unittest
diff --git a/nextmv-py.code-workspace b/nextmv-py.code-workspace
index 5709732..8234f0a 100644
--- a/nextmv-py.code-workspace
+++ b/nextmv-py.code-workspace
@@ -1,8 +1,12 @@
 {
-	"folders": [
-		{
-			"path": "."
-		}
-	],
-	"settings": {}
+  "folders": [
+    {
+      "path": "."
+    }
+  ],
+  "settings": {
+    "python.testing.unittestArgs": ["-v", "-s", "./tests", "-p", "test*.py"],
+    "python.testing.pytestEnabled": false,
+    "python.testing.unittestEnabled": true
+  }
 }
diff --git a/nextmv/nextroute/schema/__init__.py b/nextmv/nextroute/schema/__init__.py
index 9823e5f..c9080f6 100644
--- a/nextmv/nextroute/schema/__init__.py
+++ b/nextmv/nextroute/schema/__init__.py
@@ -1,6 +1,12 @@
 """Schema (class) definitions for the entities in Nextroute."""
 
+from .input import Defaults as Defaults
+from .input import DurationGroup as DurationGroup
+from .input import Input as Input
 from .location import Location as Location
+from .stop import AlternateStop as AlternateStop
 from .stop import Stop as Stop
+from .stop import StopDefaults as StopDefaults
 from .vehicle import InitialStop as InitialStop
 from .vehicle import Vehicle as Vehicle
+from .vehicle import VehicleDefaults as VehicleDefaults
diff --git a/nextmv/nextroute/schema/base.py b/nextmv/nextroute/schema/base.py
index 602b22b..b5bb0dd 100644
--- a/nextmv/nextroute/schema/base.py
+++ b/nextmv/nextroute/schema/base.py
@@ -1,5 +1,6 @@
 """Base class for data wrangling."""
 
+import json
 from dataclasses import asdict, dataclass
 from typing import Any
 
@@ -14,6 +15,15 @@ def from_dict(cls, data: dict[str, Any]):
 
         return cls(**data)
 
+    @classmethod
+    def from_json(cls, filepath: str):
+        """Instantiates the class from a JSON file."""
+
+        with open(filepath) as f:
+            data = json.load(f)
+
+        return cls.from_dict(data)
+
     def to_dict(self) -> dict[str, Any]:
         """Converts the class to a dict."""
 
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/nextroute/__init__.py b/tests/nextroute/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/nextroute/schema/__init__.py b/tests/nextroute/schema/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/nextroute/schema/input.json b/tests/nextroute/schema/input.json
new file mode 100644
index 0000000..bfb9969
--- /dev/null
+++ b/tests/nextroute/schema/input.json
@@ -0,0 +1,263 @@
+{
+  "defaults": {
+    "vehicles": {
+      "capacity": {
+        "bunnies": 20,
+        "rabbits": 10
+      },
+      "start_location": {
+        "lat": 35.791729813680874,
+        "lon": -78.7401685145487
+      },
+      "end_location": {
+        "lat": 35.791729813680874,
+        "lon": -78.7401685145487
+      },
+      "speed": 10
+    },
+    "stops": {
+      "duration": 300,
+      "quantity": {
+        "bunnies": -1,
+        "rabbits": -1
+      },
+      "unplanned_penalty": 200000,
+      "target_arrival_time": "2023-01-01T10:00:00Z",
+      "early_arrival_time_penalty": 1.5,
+      "late_arrival_time_penalty": 1.5
+    }
+  },
+  "stops": [
+    {
+      "id": "s1",
+      "location": {
+        "lon": -78.90919,
+        "lat": 35.72389
+      },
+      "compatibility_attributes": ["premium"]
+    },
+    {
+      "id": "s2",
+      "location": {
+        "lon": -78.813862,
+        "lat": 35.75712
+      },
+      "compatibility_attributes": ["premium"]
+    },
+    {
+      "id": "s3",
+      "location": {
+        "lon": -78.92996,
+        "lat": 35.932795
+      },
+      "compatibility_attributes": ["premium"]
+    },
+    {
+      "id": "s4",
+      "location": {
+        "lon": -78.505745,
+        "lat": 35.77772
+      },
+      "compatibility_attributes": ["premium"]
+    },
+    {
+      "id": "s5",
+      "location": {
+        "lon": -78.75084,
+        "lat": 35.732995
+      },
+      "compatibility_attributes": ["premium"]
+    },
+    {
+      "id": "s6",
+      "location": {
+        "lon": -78.788025,
+        "lat": 35.813025
+      },
+      "compatibility_attributes": ["premium"]
+    },
+    {
+      "id": "s7",
+      "location": {
+        "lon": -78.749391,
+        "lat": 35.74261
+      },
+      "compatibility_attributes": ["premium"]
+    },
+    {
+      "id": "s8",
+      "location": {
+        "lon": -78.94658,
+        "lat": 36.039135
+      },
+      "compatibility_attributes": ["basic"]
+    },
+    {
+      "id": "s9",
+      "location": {
+        "lon": -78.64972,
+        "lat": 35.64796
+      },
+      "compatibility_attributes": ["basic"]
+    },
+    {
+      "id": "s10",
+      "location": {
+        "lon": -78.747955,
+        "lat": 35.672955
+      },
+      "compatibility_attributes": ["basic"]
+    },
+    {
+      "id": "s11",
+      "location": {
+        "lon": -78.83403,
+        "lat": 35.77013
+      },
+      "compatibility_attributes": ["basic"]
+    },
+    {
+      "id": "s12",
+      "location": {
+        "lon": -78.864465,
+        "lat": 35.782855
+      },
+      "compatibility_attributes": ["basic"]
+    },
+    {
+      "id": "s13",
+      "location": {
+        "lon": -78.952142,
+        "lat": 35.88029
+      },
+      "compatibility_attributes": ["basic"]
+    },
+    {
+      "id": "s14",
+      "location": {
+        "lon": -78.52748,
+        "lat": 35.961465
+      },
+      "compatibility_attributes": ["basic"]
+    },
+    {
+      "id": "s15",
+      "location": {
+        "lon": -78.89832,
+        "lat": 35.83202
+      }
+    },
+    {
+      "id": "s16",
+      "location": {
+        "lon": -78.63216,
+        "lat": 35.83458
+      }
+    },
+    {
+      "id": "s17",
+      "location": {
+        "lon": -78.76063,
+        "lat": 35.67337
+      }
+    },
+    {
+      "id": "s18",
+      "location": {
+        "lon": -78.911485,
+        "lat": 36.009015
+      }
+    },
+    {
+      "id": "s19",
+      "location": {
+        "lon": -78.522705,
+        "lat": 35.93663
+      }
+    },
+    {
+      "id": "s20",
+      "location": {
+        "lon": -78.995162,
+        "lat": 35.97414
+      }
+    },
+    {
+      "id": "s21",
+      "location": {
+        "lon": -78.50509,
+        "lat": 35.7606
+      }
+    },
+    {
+      "id": "s22",
+      "location": {
+        "lon": -78.828547,
+        "lat": 35.962635
+      },
+      "precedes": ["s16", "s23"]
+    },
+    {
+      "id": "s23",
+      "location": {
+        "lon": -78.60914,
+        "lat": 35.84616
+      },
+      "start_time_window": [
+        "2023-01-01T09:00:00-06:00",
+        "2023-01-01T09:30:00-06:00"
+      ]
+    },
+    {
+      "id": "s24",
+      "location": {
+        "lon": -78.65521,
+        "lat": 35.740605
+      },
+      "start_time_window": [
+        "2023-01-01T09:00:00-06:00",
+        "2023-01-01T09:30:00-06:00"
+      ],
+      "succeeds": "s25"
+    },
+    {
+      "id": "s25",
+      "location": {
+        "lon": -78.92051,
+        "lat": 35.887575
+      },
+      "start_time_window": [
+        "2023-01-01T09:00:00-06:00",
+        "2023-01-01T09:30:00-06:00"
+      ],
+      "precedes": "s26"
+    },
+    {
+      "id": "s26",
+      "location": {
+        "lon": -78.84058,
+        "lat": 35.823865
+      },
+      "start_time_window": [
+        "2023-01-01T09:00:00-06:00",
+        "2023-01-01T09:30:00-06:00"
+      ]
+    }
+  ],
+  "vehicles": [
+    {
+      "id": "vehicle-0",
+      "start_time": "2023-01-01T06:00:00-06:00",
+      "end_time": "2023-01-01T10:00:00-06:00",
+      "activation_penalty": 4000,
+      "compatibility_attributes": ["premium"]
+    },
+    {
+      "id": "vehicle-1",
+      "start_time": "2023-01-01T10:00:00-06:00",
+      "end_time": "2023-01-01T16:00:00-06:00",
+      "max_duration": 21000,
+      "compatibility_attributes": ["basic"]
+    }
+  ]
+}
diff --git a/tests/nextroute/schema/test_input.py b/tests/nextroute/schema/test_input.py
new file mode 100644
index 0000000..51e3ae4
--- /dev/null
+++ b/tests/nextroute/schema/test_input.py
@@ -0,0 +1,21 @@
+import json
+import os
+import unittest
+
+from nextmv.nextroute.schema import Input
+
+
+class TestInput(unittest.TestCase):
+    def test_from_json(self):
+        filepath = os.path.join(os.path.dirname(__file__), "input.json")
+        input = Input.from_json(filepath)
+        parsed = input.to_dict()
+        with open(filepath) as f:
+            expected = json.load(f)
+
+        self.maxDiff = None
+        self.assertEqual(
+            parsed,
+            expected,
+            "Parsing the JSON into the class and back should yield the same result.",
+        )
diff --git a/tests/test_hello.py b/tests/test_hello.py
deleted file mode 100644
index 43aba5b..0000000
--- a/tests/test_hello.py
+++ /dev/null
@@ -1,10 +0,0 @@
-import nextmv
-
-
-def test_hello():
-    nextmv.main()
-
-
-if __name__ == "__main__":
-    test_hello()
-    print("Everything passed")