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diff --git a/aoc/tests/__init__.py b/aoc/tests/__init__.py
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+++ b/aoc/tests/__init__.py
diff --git a/aoc/tests/test_datastructures.py b/aoc/tests/test_datastructures.py
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+# -*- coding: utf-8 -*-
+from aoc.datastructures import Coordinate, Coordinate3
+
+
+class TestCoordinate:
+    def test_addition(self):
+        c1 = Coordinate(1, 1)
+        c2 = Coordinate(2, 2)
+        assert c1 + c2 == Coordinate(3, 3)
+
+    def test_subtraction(self):
+        c1 = Coordinate(2, 2)
+        c2 = Coordinate(1, 1)
+        assert c1 - c2 == Coordinate(1, 1)
+
+    def test_manhattan_distance(self):
+        c1 = Coordinate(1, 1)
+        c2 = Coordinate(3, 3)
+        assert c1.manhattan_distance(c2) == 4
+
+    def test_polarity(self):
+        c1 = Coordinate(2, -3)
+        assert c1.polarity == Coordinate(1, -1)
+
+    def test_neighbours(self):
+        c = Coordinate(0, 0)
+        neighbours = {Coordinate(-1, 0), Coordinate(1, 0), Coordinate(0, -1), Coordinate(0, 1),
+                      Coordinate(-1, -1), Coordinate(-1, 1), Coordinate(1, -1), Coordinate(1, 1)}
+        assert set(c.neighbours()) == neighbours
+
+    def test_neighbours_no_diagonal(self):
+        c = Coordinate(0, 0)
+        neighbours_no_diagonal = {Coordinate(-1, 0), Coordinate(1, 0), Coordinate(0, -1), Coordinate(0, 1)}
+        assert set(c.neighbours(no_diagonal=True)) == neighbours_no_diagonal
+
+
+class TestCoordinate3:
+    def test_addition(self):
+        c1 = Coordinate3(1, 1, 1)
+        c2 = Coordinate3(2, 2, 2)
+        assert c1 + c2 == Coordinate3(3, 3, 3)
+
+    def test_subtraction(self):
+        c1 = Coordinate3(2, 2, 2)
+        c2 = Coordinate3(1, 1, 1)
+        assert c1 - c2 == Coordinate3(1, 1, 1)
+
+    def test_manhattan_distance(self):
+        c1 = Coordinate3(1, 1, 1)
+        c2 = Coordinate3(3, 3, 3)
+        assert c1.manhattan_distance(c2) == 6
+
+    def test_polarity(self):
+        c1 = Coordinate3(2, -3, 0)
+        assert c1.polarity == Coordinate3(1, -1, 0)
+
+    def test_neighbours(self):
+        c = Coordinate3(0, 0, 0)
+        neighbours = {
+            Coordinate3(-1, -1, -1), Coordinate3(-1, -1, 0), Coordinate3(-1, -1, 1),
+            Coordinate3(-1, 0, -1), Coordinate3(-1, 0, 0), Coordinate3(-1, 0, 1),
+            Coordinate3(-1, 1, -1), Coordinate3(-1, 1, 0), Coordinate3(-1, 1, 1),
+            Coordinate3(0, -1, -1), Coordinate3(0, -1, 0), Coordinate3(0, -1, 1),
+            Coordinate3(0, 0, -1), Coordinate3(0, 0, 1),
+            Coordinate3(0, 1, -1), Coordinate3(0, 1, 0), Coordinate3(0, 1, 1),
+            Coordinate3(1, -1, -1), Coordinate3(1, -1, 0), Coordinate3(1, -1, 1),
+            Coordinate3(1, 0, -1), Coordinate3(1, 0, 0), Coordinate3(1, 0, 1),
+            Coordinate3(1, 1, -1), Coordinate3(1, 1, 0), Coordinate3(1, 1, 1)
+        }
+        assert set(c.neighbours()) == neighbours
+
+    def test_neighbours_no_diagonal(self):
+        c = Coordinate3(0, 0, 0)
+        neighbours_no_diagonal = {
+            Coordinate3(-1, 0, 0), Coordinate3(1, 0, 0),
+            Coordinate3(0, -1, 0), Coordinate3(0, 1, 0),
+            Coordinate3(0, 0, -1), Coordinate3(0, 0, 1)
+        }
+        assert set(c.neighbours(no_diagonal=True)) == neighbours_no_diagonal