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+;;; Catbird Game Engine
+;;; Copyright © 2023 David Thompson <davet@gnu.org>
+;;;
+;;; Catbird is free software: you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation, either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; Catbird is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with Catbird.  If not, see <http://www.gnu.org/licenses/>.
+(define-module (tests math)
+  #:use-module (catbird math)
+  #:use-module (chickadee math vector)
+  #:use-module (srfi srfi-64)
+  #:use-module (tests utils))
+
+(with-tests "math"
+  (test-group "vec"
+    (test-equal "with 2 numbers"
+      (vec2 1.0 2.0)
+      (vec 1.0 2.0))
+    (test-equal "with 3 numbers"
+      (vec3 1.0 2.0 3.0)
+      (vec 1.0 2.0 3.0))
+    (test-equal "with a number and a vec2"
+      (vec3 1.0 2.0 3.0)
+      (vec 1.0 (vec 2.0 3.0)))
+    (test-equal "with a vec2 and a number"
+      (vec3 1.0 2.0 3.0)
+      (vec (vec 1.0 2.0) 3.0)))
+  (test-group "+"
+    (test-equal "with 2 vec2s"
+      (vec2 4.0 6.0)
+      (+ (vec 1.0 2.0) (vec 3.0 4.0)))
+    (test-equal "with a vec2 and a number"
+      (vec2 4.0 5.0)
+      (+ (vec 1.0 2.0) 3.0))
+    (test-equal "with a number and a vec2"
+      (vec2 4.0 5.0)
+      (+ 3.0 (vec 1.0 2.0)))
+    (test-equal "with 2 vec3s"
+      (vec3 5.0 7.0 9.0)
+      (+ (vec 1.0 2.0 3.0) (vec 4.0 5.0 6.0)))
+    (test-equal "with a vec3 and a number"
+      (vec3 5.0 6.0 7.0)
+      (+ (vec 1.0 2.0 3.0) 4.0))
+    (test-equal "with a number and a vec3"
+      (vec3 5.0 6.0 7.0)
+      (+ 4.0 (vec 1.0 2.0 3.0))))
+  (test-group "-"
+    (test-equal "with 2 vec2s"
+      (vec2 2.0 1.0)
+      (- (vec 3.0 2.0) (vec 1.0 1.0)))
+    (test-equal "with a vec2 and a number"
+      (vec2 2.0 1.0)
+      (- (vec 3.0 2.0) 1.0))
+    (test-equal "with 2 vec3s"
+      (vec3 3.0 2.0 1.0)
+      (- (vec 4.0 3.0 2.0) (vec 1.0 1.0 1.0)))
+    (test-equal "with a vec3 and a number"
+      (vec3 3.0 2.0 1.0)
+      (- (vec 4.0 3.0 2.0) 1.0)))
+  (test-group "*"
+    (test-equal "with 2 vec2s"
+      (vec2 3.0 8.0)
+      (* (vec 1.0 2.0) (vec 3.0 4.0)))
+    (test-equal "with a vec2 and a number"
+      (vec2 3.0 6.0)
+      (* (vec 1.0 2.0) 3.0))
+    (test-equal "with a number and a vec2"
+      (vec2 3.0 6.0)
+      (* 3.0 (vec 1.0 2.0)))
+    (test-equal "with 2 vec3s"
+      (vec3 4.0 10.0 18.0)
+      (* (vec 1.0 2.0 3.0) (vec 4.0 5.0 6.0)))
+    (test-equal "with a vec3 and a number"
+      (vec3 4.0 8.0 12.0)
+      (* (vec 1.0 2.0 3.0) 4.0))
+    (test-equal "with a number and a vec3"
+      (vec3 4.0 8.0 12.0)
+      (* 4.0 (vec 1.0 2.0 3.0))))
+  (test-group "/"
+    (test-equal "with 2 vec2s"
+      (vec2 2.0 3.0)
+      (/ (vec 4.0 9.0) (vec 2.0 3.0)))
+    (test-equal "with a vec2 and a number"
+      (vec2 2.0 4.0)
+      (/ (vec 4.0 8.0) 2.0))
+    (test-equal "with 2 vec3s"
+      (vec3 2.0 3.0 4.0)
+      (/ (vec 4.0 9.0 16.0) (vec 2.0 3.0 4.0)))
+    (test-equal "with a vec3 and a number"
+      (vec3 2.0 4.0 6.0)
+      (/ (vec 4.0 8.0 12.0) 2.0))))