diff --git a/.eslintrc.yaml b/.eslintrc.yaml
index a421fb654ef0..a6423a41d2f5 100644
--- a/.eslintrc.yaml
+++ b/.eslintrc.yaml
@@ -1,8 +1,7 @@
 extends:
 - openlayers
 env:
-    jquery: true
-    jasmine: true
+  jquery: true
 parserOptions:
   ecmaVersion: 2017
 rules:
diff --git a/contribs/gmf/src/controllers/AbstractAppController.js b/contribs/gmf/src/controllers/AbstractAppController.js
index 2e48b66107a5..8a58014ad263 100644
--- a/contribs/gmf/src/controllers/AbstractAppController.js
+++ b/contribs/gmf/src/controllers/AbstractAppController.js
@@ -30,6 +30,7 @@ import olStyleFill from 'ol/style/Fill.js';
 import olStyleStroke from 'ol/style/Stroke.js';
 import olStyleStyle from 'ol/style/Style.js';
 import {ThemeEventType} from 'gmf/theme/Manager.js';
+import {getBrowserLanguage} from 'ngeo/utils.js';
 
 
 /**
@@ -413,11 +414,6 @@ export function AbstractAppController(config, map, $scope, $injector) {
     }
   );
 
-  /**
-   * @type {import('ngeo/misc/getBrowserLanguage.js').miscGetBrowserLanguage}
-   */
-  this.getBrowserLanguage = $injector.get('ngeoGetBrowserLanguage');
-
   /**
    * @type {import("ngeo/statemanager/Service.js").StatemanagerService}
    */
@@ -708,8 +704,7 @@ AbstractAppController.prototype.initLanguage = function() {
     });
   });
 
-  const browserLanguage = /** @type {string|undefined} */
-      (this.getBrowserLanguage(Object.keys(this.langUrls)));
+  const browserLanguage = getBrowserLanguage(Object.keys(this.langUrls));
   const urlLanguage = /** @type {string|undefined} */
       (this.stateManager.getInitialStringValue('lang'));
 
diff --git a/contribs/gmf/test/.eslintrc.yaml b/contribs/gmf/test/.eslintrc.yaml
new file mode 100644
index 000000000000..73255ae23afc
--- /dev/null
+++ b/contribs/gmf/test/.eslintrc.yaml
@@ -0,0 +1,2 @@
+env:
+  jasmine: true
diff --git a/karma-conf.js b/karma-conf.js
index 6db074139a2a..552e704d1bd5 100644
--- a/karma-conf.js
+++ b/karma-conf.js
@@ -18,7 +18,7 @@ module.exports = function(config) {
 
     // frameworks to use
     // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
-    frameworks: ['jasmine'],
+    frameworks: ['jasmine', 'sinon'],
 
     // list of files / patterns to load in the browser
     files: [
diff --git a/package.json b/package.json
index 882661a825e4..704cbdc590e9 100644
--- a/package.json
+++ b/package.json
@@ -98,6 +98,7 @@
     "karma": "^4.1.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-jasmine": "^2.0.1",
+    "karma-sinon": "^1.0.5",
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^4.0.2",
     "loader-utils": "^1.2.3",
@@ -115,6 +116,7 @@
     "proj4": "^2.5.0",
     "raven-js": "^3.27.1",
     "simple-html-tokenizer": "^0.1.1",
+    "sinon": "^7.3.2",
     "svg-inline-loader": "^0.8.0",
     "svgo": "^1.2.2",
     "svgo-loader": "^2.2.0",
diff --git a/src/misc/extraModule.js b/src/misc/extraModule.js
index 7644fe443c56..e2c1957b436f 100644
--- a/src/misc/extraModule.js
+++ b/src/misc/extraModule.js
@@ -11,7 +11,6 @@ import ngeoMiscFeatureHelper from 'ngeo/misc/FeatureHelper.js';
 import ngeoMiscFile from 'ngeo/misc/File.js';
 import ngeoMiscFilereaderComponent from 'ngeo/misc/filereaderComponent.js';
 import ngeoMiscFilters from 'ngeo/misc/filters.js';
-import ngeoMiscGetBrowserLanguage from 'ngeo/misc/getBrowserLanguage.js';
 import ngeoMiscSortableComponent from 'ngeo/misc/sortableComponent.js';
 import ngeoMiscTime from 'ngeo/misc/Time.js';
 import ngeoMiscToolActivateMgr from 'ngeo/misc/ToolActivateMgr.js';
@@ -31,7 +30,6 @@ export default angular.module('ngeoMiscExtraModule', [
   ngeoMiscFile.name,
   ngeoMiscFilereaderComponent.name,
   ngeoMiscFilters.name,
-  ngeoMiscGetBrowserLanguage.name,
   ngeoMiscSortableComponent.name,
   ngeoMiscTime.name,
   ngeoMiscToolActivateMgr.name,
diff --git a/src/misc/getBrowserLanguage.js b/src/misc/getBrowserLanguage.js
deleted file mode 100644
index 1c104be4468f..000000000000
--- a/src/misc/getBrowserLanguage.js
+++ /dev/null
@@ -1,53 +0,0 @@
-import angular from 'angular';
-
-
-/**
- * @type {angular.IModule}
- * @hidden
- */
-const module = angular.module('ngeoGetBrowserLanguage', []);
-
-
-/**
- * Provides a function that returns the most appropriate 2-letter
- * language code depending on the list of available languages and the browser
- * languages settings.
- * @typedef {function(string[]):string} miscGetBrowserLanguage
- */
-
-
-/**
- * Provides a function that returns the most appropriate 2-letter
- * language code depending on the list of available languages and the browser
- * languages settings.
- *
- * @param {angular.IWindowService} $window Angular $window service.
- * @return {miscGetBrowserLanguage} The "GetBrowserLanguage" function.
- *
- * @ngdoc service
- * @ngname ngeoGetBrowserLanguage
- * @ngInject
- * @private
- * @hidden
- */
-function factory($window) {
-  return (
-    /**
-     * @param {string[]} availableLanguages Available languages.
-     * @return {string} The "best" language code.
-     */
-    function(availableLanguages) {
-      const nav = $window.navigator;
-      let browserLanguages = nav.languages || [nav.language];
-      browserLanguages = browserLanguages.map(item => item.substring(0, 2));
-      // remove duplicated language codes
-      browserLanguages = browserLanguages.filter((item, index, arr) => arr.indexOf(item) == index);
-      const supportedLanguages = browserLanguages.filter(item => availableLanguages.indexOf(item) != -1);
-      return supportedLanguages[0];
-    });
-}
-
-module.factory('ngeoGetBrowserLanguage', factory);
-
-
-export default module;
diff --git a/src/utils.js b/src/utils.js
index b7ed2a2c39a4..af9978fb75dc 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -7,6 +7,21 @@ import olGeomPoint from 'ol/geom/Point.js';
 import olGeomPolygon from 'ol/geom/Polygon.js';
 import {getTopLeft, getTopRight, getBottomLeft, getBottomRight} from 'ol/extent.js';
 
+
+/**
+ * @param {string[]} availableLanguages Available languages.
+ * @return {string} The "best" language code.
+ */
+export function getBrowserLanguage(availableLanguages) {
+  let browserLanguages = window.navigator.languages || [window.navigator.language];
+  browserLanguages = browserLanguages.map(item => item.substring(0, 2));
+  // remove duplicated language codes
+  browserLanguages = browserLanguages.filter((item, index, arr) => arr.indexOf(item) == index);
+  const supportedLanguages = browserLanguages.filter(item => availableLanguages.indexOf(item) != -1);
+  return supportedLanguages[0];
+}
+
+
 /**
  * Utility method that converts a simple geometry to its multi equivalent. If
  * the geometry itself is already multi, it is returned as-is.
diff --git a/test/.eslintrc.yaml b/test/.eslintrc.yaml
new file mode 100644
index 000000000000..0b39c32e9c04
--- /dev/null
+++ b/test/.eslintrc.yaml
@@ -0,0 +1,4 @@
+env:
+  jasmine: true
+globals:
+  sinon: true
diff --git a/test/spec/all.js b/test/spec/all.js
index 322b5377692c..ac72194fb572 100644
--- a/test/spec/all.js
+++ b/test/spec/all.js
@@ -2,11 +2,11 @@ import 'jquery';
 import 'angular';
 import 'angular-mocks';
 import 'angular-gettext';
+import './ngeo/getbrowserlanguage.spec.js';
 import './beforeeach.js';
 import './search/createlocationsearchbloodhound.spec.js';
 import './services/wmstime.spec.js';
 import './services/layerHelper.spec.js';
-import './services/getbrowserlanguage.spec.js';
 import './services/backgroundlayermgr.spec.js';
 import './services/decoratelayer.spec.js';
 import './services/wfspermalink.spec.js';
diff --git a/test/spec/ngeo/getbrowserlanguage.spec.js b/test/spec/ngeo/getbrowserlanguage.spec.js
new file mode 100644
index 000000000000..e464064a2f49
--- /dev/null
+++ b/test/spec/ngeo/getbrowserlanguage.spec.js
@@ -0,0 +1,18 @@
+import {getBrowserLanguage} from 'ngeo/utils.js';
+
+describe('ngeo.misc.getBrowserLanguage', () => {
+
+  it('gets language from navigator.languages', () => {
+    const stub = sinon.stub(window.navigator, 'languages').value(['en-US', 'zh-CN', 'ja-JP', 'fr-FR']);
+    const langCode = getBrowserLanguage(['de', 'fr', 'it']);
+    expect(langCode).toBe('fr');
+    stub.restore();
+  });
+
+  it('gets language from navigator.language', () => {
+    const stub = sinon.stub(window.navigator, 'language').value('fr-FR');
+    const langCode = getBrowserLanguage(['de', 'fr', 'it']);
+    expect(langCode).toBe('fr');
+    stub.restore();
+  });
+});
diff --git a/test/spec/services/getbrowserlanguage.spec.js b/test/spec/services/getbrowserlanguage.spec.js
deleted file mode 100644
index 5dcb2a84bbe9..000000000000
--- a/test/spec/services/getbrowserlanguage.spec.js
+++ /dev/null
@@ -1,33 +0,0 @@
-import angular from 'angular';
-describe('ngeo.misc.getBrowserLanguage', () => {
-  /** @type {Object<string, any>} */
-  let win;
-  /** @type {import('ngeo/misc/getBrowserLanguage.js').miscGetBrowserLanguage} */
-  let ngeoGetBrowserLanguage;
-
-  beforeEach(() => {
-    win = {navigator: {}};
-    angular.mock.module(
-      /**
-       * @param {angular.IModule} $provide
-       */
-      ($provide) => {
-        $provide.value('$window', win);
-      });
-    angular.mock.inject((_ngeoGetBrowserLanguage_) => {
-      ngeoGetBrowserLanguage = _ngeoGetBrowserLanguage_;
-    });
-  });
-
-  it('gets language from navigator.languages', () => {
-    win.navigator.languages = ['en-US', 'zh-CN', 'ja-JP', 'fr-FR'];
-    const langCode = ngeoGetBrowserLanguage(['de', 'fr', 'it']);
-    expect(langCode).toBe('fr');
-  });
-
-  it('gets language from navigator.language', () => {
-    win.navigator.language = 'fr-FR';
-    const langCode = ngeoGetBrowserLanguage(['de', 'fr', 'it']);
-    expect(langCode).toBe('fr');
-  });
-});