From 6ec259a0e71174651bae95d4628138bf6fd68742 Mon Sep 17 00:00:00 2001
From: kj_sh604
Date: Sun, 15 Mar 2026 16:19:35 -0400
Subject: refactor: packages/

---
 packages/math/line.test.ts | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 packages/math/line.test.ts

(limited to 'packages/math/line.test.ts')

diff --git a/packages/math/line.test.ts b/packages/math/line.test.ts
new file mode 100644
index 0000000..0e6bb1c
--- /dev/null
+++ b/packages/math/line.test.ts
@@ -0,0 +1,31 @@
+import { line, linesIntersectAt } from "./line";
+import { pointFrom } from "./point";
+
+describe("line-line intersections", () => {
+  it("should correctly detect intersection at origin", () => {
+    expect(
+      linesIntersectAt(
+        line(pointFrom(-5, -5), pointFrom(5, 5)),
+        line(pointFrom(5, -5), pointFrom(-5, 5)),
+      ),
+    ).toEqual(pointFrom(0, 0));
+  });
+
+  it("should correctly detect intersection at non-origin", () => {
+    expect(
+      linesIntersectAt(
+        line(pointFrom(0, 0), pointFrom(10, 10)),
+        line(pointFrom(10, 0), pointFrom(0, 10)),
+      ),
+    ).toEqual(pointFrom(5, 5));
+  });
+
+  it("should correctly detect parallel lines", () => {
+    expect(
+      linesIntersectAt(
+        line(pointFrom(0, 0), pointFrom(0, 10)),
+        line(pointFrom(10, 0), pointFrom(10, 10)),
+      ),
+    ).toBe(null);
+  });
+});
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