diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b512c09
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/index.js b/index.js
index 093123f..8099576 100644
--- a/index.js
+++ b/index.js
@@ -13,8 +13,8 @@ const sortby = (properties) => (a, b) => {
 
     const collator = new Intl.Collator('en', { numeric: true, sensitivity: 'base' })
     const compare = collator.compare(a[property], b[property])
-    if (compare > 0) return order
-    if (compare < 0) return -order
+    if (compare > 0) return -order
+    if (compare < 0) return order
 
   }
 
diff --git a/lib/sort.test.js b/lib/sort.test.js
new file mode 100644
index 0000000..2289ea9
--- /dev/null
+++ b/lib/sort.test.js
@@ -0,0 +1,44 @@
+import { deepEqual as equal } from 'node:assert/strict'
+import { metaltest } from 'metaltest'
+const test = metaltest('Sort')
+export { test }
+
+import { sortby } from '../index.js'
+
+const data = [
+  { age: 40, name: "Persone 1", new: true },
+  { age: 17, name: "Persone 2", new: false },
+]
+
+test('sort by name ascending', () => {
+  const result = data.sort(sortby(['name']))
+
+
+  equal(result, [
+    { age: 40, name: "Persone 1", new: true },
+    { age: 17, name: "Persone 2", new: false },
+  ])
+})
+
+test('sort by age ascending', () => {
+  const result = data.sort(sortby(['age']))
+
+
+  equal(result, [
+    { age: 17, name: "Persone 2", new: false },
+    { age: 40, name: "Persone 1", new: true },
+  ])
+})
+
+test('sort by age descending', () => {
+  const result = data.sort(sortby(['age', 'desc']))
+
+
+  equal(result, [
+    { age: 40, name: "Persone 1", new: true },
+    { age: 17, name: "Persone 2", new: false },
+  ])
+})
+
+import { runifmain, summaryreporter, errorreporter } from 'metaltest'
+await runifmain(import.meta, () => test.run(summaryreporter(), errorreporter()))
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 9a7c780..529611b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,35 @@
 {
   "name": "sortby",
+  "version": "1.0.0",
   "lockfileVersion": 3,
   "requires": true,
-  "packages": {}
+  "packages": {
+    "": {
+      "name": "sortby",
+      "version": "1.0.0",
+      "license": "AGPL-3.0-or-later",
+      "dependencies": {
+        "metaltest": "git+https://git.tranche.ca/fmatte/metaltest"
+      }
+    },
+    "node_modules/chalk": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-5.3.0.tgz",
+      "integrity": "sha512-dLitG79d+GV1Nb/VYcCDFivJeK1hiukt9QjRNVOsUtTy1rR1YJsmpGGTZ3qJos+uw7WmWF4wUwBd9jxjocFC2w==",
+      "engines": {
+        "node": "^12.17.0 || ^14.13 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/metaltest": {
+      "version": "1.3.0",
+      "resolved": "git+https://git.tranche.ca/fmatte/metaltest#90b20029c9dde21218e2464a1e8958435fd42286",
+      "license": "AGPL-3.0-or-later",
+      "dependencies": {
+        "chalk": "^5.1.2"
+      }
+    }
+  }
 }
diff --git a/package.json b/package.json
index 7b98eb7..b25b4f6 100644
--- a/package.json
+++ b/package.json
@@ -9,5 +9,8 @@
   "repository": {
     "type": "git",
     "url": "https://git.tranche.ca/fmatte/sortby"
+  },
+  "dependencies": {
+    "metaltest": "git+https://git.tranche.ca/fmatte/metaltest"
   }
 }