rover: use Pydantic for Vector and Rover classes

Pydantic is similar to Dataclasses, but enables run-time type-checking.

rover/Pipfile

@@ -8,6 +8,7 @@ pytest = "*"
 pytest-cov = "*"
 
 [packages]
+pydantic = "*"
 
 [requires]
 python_version = "3.8"

rover/Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "4e6c8e77ff1a48b470f5c8aa479b97d87225ac2cd2fb9b9f9ebceae1713e3adb"
+            "sha256": "afeb69259202b698c70d288232d6bd89a36b75720f9efeb8f0360d5f8a5217dd"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -15,7 +15,20 @@
             }
         ]
     },
-    "default": {},
+    "default": {
+        "pydantic": {
+            "hashes": [
+                "sha256:2588e5c68b7927fd44c4bf2c5768cdaff7948fc4ae0e3f602376b76b1913c3b0",
+                "sha256:2d8d8c14b6349066e27aca9bfd3fb973fb2c45a860a6ba83fbea16ee42efbfd1",
+                "sha256:40b62f5e8db4957221e4aa06cea015c4a74740405edea0e11def4c6418e7c62c",
+                "sha256:43f8ac74e114aaac0d844040fea971fc6c53434f24cee2e1aa0486e6601817b4",
+                "sha256:4f3baf0b4ef8f68021186448efddbcc259ed473e18acf4433ef75dd13d795594",
+                "sha256:f85a63028003d8778dc3bf27c5c5cd25da64593422ab82a696cca32b1ce3e750"
+            ],
+            "index": "pypi",
+            "version": "==1.1"
+        }
+    },
     "develop": {
         "atomicwrites": {
             "hashes": [

rover/rover.py

@@ -1,11 +1,11 @@
 import enum
-from dataclasses import dataclass
+
+from pydantic import BaseModel
 
 
-@dataclass
+class Vector(BaseModel):
-class Vector:
+    x: int = 0
-    x: int
+    y: int = 0
-    y: int
 
 
 class Direction(enum.Enum):
@@ -15,8 +15,7 @@ class Direction(enum.Enum):
     WEST = "W"
 
 
-@dataclass
+class Rover(BaseModel):
-class Rover:
+    pos: Vector = Vector(x=0, y=0)
-    pos: Vector = (0, 0)
+    planet_size: Vector = Vector(x=100, y=100)
-    planet_size: Vector = (100, 100)
     dir: Direction = Direction.NORTH

rover/test_rover.py

@@ -1,14 +1,14 @@
-from rover import Direction, Rover
+from rover import Direction, Rover, Vector
 
 
 def test_rover_constructor():
-    rov = Rover(pos=(0, 0), planet_size=(100, 100))
+    rov = Rover(pos={"x": 0, "y": 0}, planet_size={"x": 100, "y": 100})
-    assert rov.pos == (0, 0) and rov.planet_size == (100, 100)
+    assert rov.pos == Vector(x=0, y=0) and rov.planet_size == Vector(x=100, y=100)
 
 
 def test_rover_default_values():
     rov = Rover()
-    assert rov.pos == (0, 0) and rov.planet_size == (100, 100)
+    assert rov.pos == Vector(x=0, y=0) and rov.planet_size == Vector(x=100, y=100)
 
 
 def test_rover_has_direction():