From 352480ac14c8daa5509b269cdf67a6ee2baf3f18 Mon Sep 17 00:00:00 2001
From: David Moody <david.moody@penta-inc.com>
Date: Fri, 24 Oct 2025 10:08:28 -0500
Subject: [PATCH 1/4] add test_dot_product to test_vector.py

---
 test/test_vector.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/test_vector.py b/test/test_vector.py
index 1f4ae0c..04d7304 100644
--- a/test/test_vector.py
+++ b/test/test_vector.py
@@ -10,3 +10,11 @@ class TestVector(unittest.TestCase):
         v3 = v1 + v2
         self.assertIsInstance(v3, Vector)
         self.assertEqual(v3.x, v1.x + v2.x)
+        
+    def test_dot_product(self):
+        v1 = Vector(1, 2, 3)
+        v2 = Vector(-3, -2, -1)
+        v3 = v1.dot(v2)
+        self.assertEqual(v3,v1.x * v2.x + v1.y * v2.y + v1.z * v2.z)
+        vzero = Vector(0, 0, 0)
+        self.assertEqual(v1.dot(vzero),0)

From 13ac74132c8496cb924f98a568ebb56dfa4ee64a Mon Sep 17 00:00:00 2001
From: Corran Webster <cwebster@unital.dev>
Date: Fri, 24 Oct 2025 16:13:25 +0100
Subject: [PATCH 2/4] Add cross-product and tests

---
 test/test_vector.py | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/test/test_vector.py b/test/test_vector.py
index 1f4ae0c..3606b6d 100644
--- a/test/test_vector.py
+++ b/test/test_vector.py
@@ -4,6 +4,28 @@ from fancymath.vector import Vector
 
 
 class TestVector(unittest.TestCase):
+    def test_cross_product(self):
+        # given
+        v1 = Vector(1, 2, 3)
+        v2 = Vector(3, 2, 1)
+
+        # when
+        v3 = v1 * v2
+
+        # then
+        self.assertIsInstance(v3, Vector)
+        self.assertEqual(v3.x, -4)
+        self.assertEqual(v3.y, 8)
+        self.assertEqual(v3.z, -4)
+
+    def test_cross_product_failure(self):
+        v1 = Vector(1, 2, 3)
+        v2 = (3, 2, 1)
+
+        with self.assertRaises(TypeError):
+            v1 * v2
+
+
     def test_add_vector(self):
         v1 = Vector(1, 2, 3)
         v2 = Vector(-3, -2, -1)

From 4d5e2db71adc7d9e4467d9b07ff72950070b16b1 Mon Sep 17 00:00:00 2001
From: Tim Diller <tim@dillerdigital.com>
Date: Fri, 24 Oct 2025 10:11:43 -0500
Subject: [PATCH 3/4] add test for proper failure of Vector.dot

---
 test/test_vector.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/test/test_vector.py b/test/test_vector.py
index 04d7304..d3b0f65 100644
--- a/test/test_vector.py
+++ b/test/test_vector.py
@@ -11,6 +11,11 @@ class TestVector(unittest.TestCase):
         self.assertIsInstance(v3, Vector)
         self.assertEqual(v3.x, v1.x + v2.x)
         
+    def test_dot_failure(self):
+        with self.assertRaises(ValueError):
+            v1 = Vector(1, 2, 3)
+            v1.dot(3)
+
     def test_dot_product(self):
         v1 = Vector(1, 2, 3)
         v2 = Vector(-3, -2, -1)

From 437be17f51b8bc7fbf9e79cceff3769e98ac04de Mon Sep 17 00:00:00 2001
From: Corran Webster <cwebster@unital.dev>
Date: Fri, 24 Oct 2025 16:21:50 +0100
Subject: [PATCH 4/4] Add cross product impleimentation

---
 src/fancymath/vector.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/fancymath/vector.py b/src/fancymath/vector.py
index 6c10466..c027e5b 100644
--- a/src/fancymath/vector.py
+++ b/src/fancymath/vector.py
@@ -36,6 +36,14 @@ class Vector(object):
         z = self.z + other.z
         return self.__class__(x, y, z)
 
+    def __mul__(self, other):
+        if not isinstance(other, Vector):
+            return NotImplemented
+        x = self.y * other.z - self.z * other.y
+        y = self.z * other.x - self.x * other.z
+        z = self.x * other.y - self.y * other.x
+        return self.__class__(x, y, z)
+
 
 if __name__ == "__main__":
     v1 = Vector(3, 4, 0)