diff --git a/tests/node/index.mjs b/tests/node/index.mjs
index c5baeedd7..f872f8f48 100644
--- a/tests/node/index.mjs
+++ b/tests/node/index.mjs
@@ -22,7 +22,6 @@ import "./tests/File.mjs";
 import "./tests/Dish.mjs";
 import "./tests/NodeDish.mjs";
 import "./tests/Utils.mjs";
-import "./tests/Arithmetic.mjs";
 import "./tests/Categories.mjs";
 import "./tests/lib/BigIntUtils.mjs";
 
diff --git a/tests/node/tests/Arithmetic.mjs b/tests/node/tests/Arithmetic.mjs
deleted file mode 100644
index eb72a8386..000000000
--- a/tests/node/tests/Arithmetic.mjs
+++ /dev/null
@@ -1,17 +0,0 @@
-import assert from "assert";
-import BigNumber from "bignumber.js";
-import it from "../assertionHandler.mjs";
-import TestRegister from "../../lib/TestRegister.mjs";
-import { median } from "../../../src/core/lib/Arithmetic.mjs";
-
-TestRegister.addApiTests([
-    it("Arithmetic: median sorts odd-length input", () => {
-        const result = median([new BigNumber(10), new BigNumber(1), new BigNumber(2)]);
-        assert.strictEqual(result.toString(), "2");
-    }),
-
-    it("Arithmetic: median keeps even-length behavior", () => {
-        const result = median([new BigNumber(10), new BigNumber(1), new BigNumber(2), new BigNumber(5)]);
-        assert.strictEqual(result.toString(), "3.5");
-    }),
-]);
diff --git a/tests/operations/index.mjs b/tests/operations/index.mjs
index fb03a5f71..702d552ef 100644
--- a/tests/operations/index.mjs
+++ b/tests/operations/index.mjs
@@ -109,6 +109,7 @@ import "./tests/LuhnChecksum.mjs";
 import "./tests/LZNT1Decompress.mjs";
 import "./tests/LZString.mjs";
 import "./tests/Magic.mjs";
+import "./tests/Median.mjs";
 import "./tests/Media.mjs";
 import "./tests/MIMEDecoding.mjs";
 import "./tests/Modhex.mjs";
diff --git a/tests/operations/tests/Median.mjs b/tests/operations/tests/Median.mjs
new file mode 100644
index 000000000..74bbfe746
--- /dev/null
+++ b/tests/operations/tests/Median.mjs
@@ -0,0 +1,33 @@
+/**
+ * Median operation tests.
+ *
+ * @author copilot-swe-agent[bot]
+ * @copyright Crown Copyright 2018
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        name: "Median: sorts odd-length input",
+        input: "10 1 2",
+        expectedOutput: "2",
+        recipeConfig: [
+            {
+                op: "Median",
+                args: ["Space"],
+            },
+        ],
+    },
+    {
+        name: "Median: keeps even-length behavior",
+        input: "10 1 2 5",
+        expectedOutput: "3.5",
+        recipeConfig: [
+            {
+                op: "Median",
+                args: ["Space"],
+            },
+        ],
+    },
+]);