feat(ai): add get_peaks unittests

tests/ai/test_fitness.py

@@ -0,0 +1,31 @@
+import unittest
+
+import numpy as np
+from ai.fitness.peaks import get_peaks
+
+
+class TestFitness(unittest.TestCase):
+    def test_get_peaks(self) -> None:
+        field = np.array(
+            [
+                [0, 1, 0, 0, 1],
+                [1, 0, 0, 1, 0],
+                [0, 1, 1, 0, 0],
+            ]
+        )
+        self.assertEqual(get_peaks(field), 11)
+
+    def test_get_peaks_zeros(self) -> None:
+        field = np.zeros((3, 5))
+        self.assertEqual(get_peaks(field), 0)
+
+    def test_single_peak(self):
+        field = np.array(
+            [
+                [0, 0, 0, 0, 0],
+                [0, 1, 0, 0, 0],
+                [0, 0, 0, 0, 0],
+            ]
+        )
+
+        self.assertEqual(get_peaks(field), 2)