diff --git a/src/extensions/ElapsedTime.test.ts b/src/extensions/ElapsedTime.test.ts
new file mode 100644
index 00000000..b8cbbdce
--- /dev/null
+++ b/src/extensions/ElapsedTime.test.ts
@@ -0,0 +1,80 @@
+import { describe, test } from "node:test";
+import assert from "node:assert/strict";
+import { ElapsedTime } from "./ElapsedTime";
+
+describe("ElapsedTime", () => {
+ test("should be able to be initialised", () => {
+ const db = new ElapsedTime(0n);
+ assert.equal(db != null, true);
+ });
+
+ test("should return correct total nanoseconds", () => {
+ const db = new ElapsedTime(1234567890n);
+ assert.equal(db.totalNanoseconds, 1234567890n);
+ });
+
+ test("should return correct total microseconds", () => {
+ const db = new ElapsedTime(1234567890n);
+ assert.equal(db.totalMicroseconds, 1234567);
+ });
+
+ test("should return correct total milliseconds", () => {
+ const db = new ElapsedTime(1234567890n);
+ assert.equal(db.totalMilliseconds, 1234);
+ });
+
+ test("should return correct total seconds", () => {
+ const db = new ElapsedTime(5000000000n);
+ assert.equal(db.totalSeconds, 5);
+ });
+
+ test("should return correct total minutes", () => {
+ const db = new ElapsedTime(300000000000n); // 5 minutes
+ assert.equal(db.totalMinutes, 5);
+ });
+
+ test("should return correct total hours", () => {
+ const db = new ElapsedTime(7200000000000n); // 2 hours
+ assert.equal(db.totalHours, 2);
+ });
+
+ test("should return correct total days", () => {
+ const db = new ElapsedTime(172800000000000n); // 2 days
+ assert.equal(db.totalDays, 2);
+ });
+
+ test("should return correct nanoseconds", () => {
+ const db = new ElapsedTime(1234567890n);
+ assert.equal(db.nanoseconds, 890);
+ });
+
+ test("should return correct microseconds", () => {
+ const db = new ElapsedTime(1234567890n);
+ assert.equal(db.microseconds, 567);
+ });
+
+ test("should return correct milliseconds", () => {
+ const db = new ElapsedTime(1234567890n);
+ assert.equal(db.milliseconds, 234);
+ });
+
+ test("should return correct seconds", () => {
+ const db = new ElapsedTime(5000000000n);
+ assert.equal(db.seconds, 5);
+ });
+
+ test("should return correct minutes", () => {
+ const db = new ElapsedTime(300000000000n); // 5 minutes
+ assert.equal(db.minutes, 5);
+ });
+
+ test("should return correct hours", () => {
+ const db = new ElapsedTime(7200000000000n); // 2 hours
+ assert.equal(db.hours, 2);
+ });
+
+ test("should return correct days", () => {
+ const db = new ElapsedTime(172800000000000n); // 2 days
+ assert.equal(db.days, 2);
+ });
+});
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