diff --git a/app/paroles/[slug]/page.js b/app/paroles/[slug]/page.js
index 68f1753..4065cae 100644
--- a/app/paroles/[slug]/page.js
+++ b/app/paroles/[slug]/page.js
@@ -3,7 +3,7 @@ import Box from '@mui/material/Box'
 
 import {jwennTeksEpiSlug} from '../../../lib/oki-api'
 import AnTeks from '../../../components/teks/an-teks'
-import {getAlias} from '../../../lib/utils/format'
+import {getAlias} from '../../../lib/utils/get-alias'
 import {formatKuveti} from '../../../lib/kuveti'
 import Footer from '../../../components/footer'
 
diff --git a/components/akey/an-vedette.js b/components/akey/an-vedette.js
index c22d285..cd4b0d3 100644
--- a/components/akey/an-vedette.js
+++ b/components/akey/an-vedette.js
@@ -10,7 +10,7 @@ import Chip from '@mui/material/Chip'
 import Image from 'next/image'
 import Link from 'next/link'
 
-import {getAlias} from '../../lib/utils/format'
+import {getAlias} from '../../lib/utils/get-alias'
 import {formatKuveti} from '../../lib/kuveti'
 
 const IMAGE_URL = process.env.NEXT_PUBLIC_API_URL_ROOT || 'http://localhost:1337'
diff --git a/components/awtis/mizik-lyen.js b/components/awtis/mizik-lyen.js
index bbd0134..30c4866 100644
--- a/components/awtis/mizik-lyen.js
+++ b/components/awtis/mizik-lyen.js
@@ -12,7 +12,7 @@ import LibraryMusicIcon from '@mui/icons-material/LibraryMusic'
 import ExplicitIcon from '@mui/icons-material/Explicit'
 
 import {esBrandNew} from '../../lib/date'
-import {getAlias} from '../../lib/utils/format'
+import {getAlias} from '../../lib/utils/get-alias'
 
 const apiUrl = process.env.NEXT_PUBLIC_API_URL_ROOT || 'http://localhost:1337'
 
diff --git a/components/teks/lekte.js b/components/teks/lekte.js
index 9cee8ee..c17ebc4 100644
--- a/components/teks/lekte.js
+++ b/components/teks/lekte.js
@@ -16,7 +16,7 @@ import Image from 'next/image'
 import {grey} from '@mui/material/colors'
 import {Link} from '@mui/material'
 
-import {getAlias} from '../../lib/utils/format'
+import {getAlias} from '../../lib/utils/get-alias'
 import {formatKuveti} from '../../lib/kuveti'
 
 const IMAGE_URL = process.env.NEXT_PUBLIC_API_URL_ROOT || 'http://localhost:1337'
diff --git a/components/teks/teks-kat.js b/components/teks/teks-kat.js
index 444eef8..7c25595 100644
--- a/components/teks/teks-kat.js
+++ b/components/teks/teks-kat.js
@@ -15,7 +15,7 @@ import Grid from '@mui/material/Grid'
 import ExplicitIcon from '@mui/icons-material/Explicit'
 import {styled} from '@mui/material/styles'
 
-import {getAlias} from '../../lib/utils/format'
+import {getAlias} from '../../lib/utils/get-alias'
 import {formatKuveti} from '../../lib/kuveti'
 
 const PREFIX = 'teks-kat'
diff --git a/components/teks/teks.js b/components/teks/teks.js
index f96b5c4..7306eda 100644
--- a/components/teks/teks.js
+++ b/components/teks/teks.js
@@ -18,7 +18,8 @@ import ArrowForwardIosIcon from '@mui/icons-material/ArrowForwardIos'
 
 import Image from 'next/image'
 
-import {formatJsonString, getAlias} from '../../lib/utils/format'
+import {formatJsonString} from '../../lib/utils/format'
+import {getAlias} from '../../lib/utils/get-alias'
 import {formatKuveti} from '../../lib/kuveti'
 
 import LicenseModal from '../cc/license-modal'
diff --git a/lib/utils/__tests__/get-alias.test.js b/lib/utils/__tests__/get-alias.test.js
new file mode 100644
index 0000000..537815d
--- /dev/null
+++ b/lib/utils/__tests__/get-alias.test.js
@@ -0,0 +1,26 @@
+import {describe, it, expect} from 'vitest'
+import {getAlias} from '../get-alias'
+
+describe('getAlias', () => {
+  it('retourne une chaîne vide sans planter quand artistes est undefined', () => {
+    expect(getAlias(undefined)).toBe('')
+  })
+
+  it('retourne une chaîne vide sans planter quand artistes est un tableau vide', () => {
+    expect(getAlias([])).toBe('')
+  })
+
+  it('retourne l\'alias unique quand il n\'y a qu\'un artiste', () => {
+    expect(getAlias([{id: 1, alias: 'Foo'}])).toBe('Foo')
+  })
+
+  it('ignore un id de priorité qui ne correspond à aucun artiste (donnée obsolète)', () => {
+    const artistes = [{id: 1, alias: 'Foo'}, {id: 2, alias: 'Bar'}]
+    expect(getAlias(artistes, '1-99-2')).toBe('Foo et Bar')
+  })
+
+  it('formate plusieurs artistes selon la priorité fournie', () => {
+    const artistes = [{id: 1, alias: 'Foo'}, {id: 2, alias: 'Bar'}]
+    expect(getAlias(artistes, '2-1')).toBe('Bar et Foo')
+  })
+})
diff --git a/lib/utils/format.js b/lib/utils/format.js
index e798515..42c4117 100644
--- a/lib/utils/format.js
+++ b/lib/utils/format.js
@@ -1,54 +1,2 @@
-import slugify from 'slugify'
-
 export const formatJsonString = stringToFormat =>
   stringToFormat.split('\n').map((string, index) => <div key={index}>{`${string}`}<br /></div>) // eslint-disable-line react/no-array-index-key
-
-export const getAlias = (artistes, priorite = null, enhanced = false) => {
-  if (artistes.length === 1 && !enhanced) {
-    return artistes[0].alias
-  }
-
-  if (artistes.length === 1 && enhanced) {
-    return [{
-      type: 'element',
-      value: artistes[0].alias
-    }]
-  }
-
-  const alias = []
-  const splittedPriority = priorite ? priorite.split('-')
-    .map(p => Number.parseInt(p, 10)) : null
-
-  if (splittedPriority) {
-    for (const element of splittedPriority) {
-      const foundedArtistes = artistes.find(({id}) => id === element)
-      alias.push(foundedArtistes.alias)
-    }
-  } else {
-    for (const artiste of artistes) {
-      alias.push(artiste.alias)
-    }
-  }
-
-  if (enhanced) {
-    const list = new Intl.ListFormat('fr').formatToParts(alias)
-    return list
-  }
-
-  return new Intl.ListFormat('fr').format(alias)
-}
-
-function separateString(inputString) {
-  const regex = /\s*,\s*|\s+et\s+/
-  const strings = inputString.split(regex).map(element => element.trim())
-  return strings
-}
-
-export const getAliasObject = inputString => {
-  const awtis = separateString(inputString)
-
-  return awtis.map(alias => ({
-    alias,
-    slug: slugify(alias, {lower: true, remove: /[*#+~.()'"!:@]/g})
-  }))
-}
diff --git a/lib/utils/get-alias.js b/lib/utils/get-alias.js
new file mode 100644
index 0000000..f968fb5
--- /dev/null
+++ b/lib/utils/get-alias.js
@@ -0,0 +1,55 @@
+import slugify from 'slugify'
+
+export const getAlias = (artistes, priorite = null, enhanced = false) => {
+  const safeArtistes = artistes || []
+
+  if (safeArtistes.length === 1 && !enhanced) {
+    return safeArtistes[0].alias
+  }
+
+  if (safeArtistes.length === 1 && enhanced) {
+    return [{
+      type: 'element',
+      value: safeArtistes[0].alias
+    }]
+  }
+
+  const alias = []
+  const splittedPriority = priorite ? priorite.split('-')
+    .map(p => Number.parseInt(p, 10)) : null
+
+  if (splittedPriority) {
+    for (const element of splittedPriority) {
+      const foundedArtistes = safeArtistes.find(({id}) => id === element)
+      if (foundedArtistes) {
+        alias.push(foundedArtistes.alias)
+      }
+    }
+  } else {
+    for (const artiste of safeArtistes) {
+      alias.push(artiste.alias)
+    }
+  }
+
+  if (enhanced) {
+    const list = new Intl.ListFormat('fr').formatToParts(alias)
+    return list
+  }
+
+  return new Intl.ListFormat('fr').format(alias)
+}
+
+function separateString(inputString) {
+  const regex = /\s*,\s*|\s+et\s+/
+  const strings = inputString.split(regex).map(element => element.trim())
+  return strings
+}
+
+export const getAliasObject = inputString => {
+  const awtis = separateString(inputString)
+
+  return awtis.map(alias => ({
+    alias,
+    slug: slugify(alias, {lower: true, remove: /[*#+~.()'"!:@]/g})
+  }))
+}