Move from browser-request to fetch (#9345)

test/setup/setupLanguage.ts

@@ -14,7 +14,70 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import fetchMock from "fetch-mock-jest";
+
 import * as languageHandler from "../../src/languageHandler";
+import en from "../../src/i18n/strings/en_EN.json";
+import de from "../../src/i18n/strings/de_DE.json";
+
+fetchMock.config.overwriteRoutes = false;
+fetchMock.catch("");
+window.fetch = fetchMock.sandbox();
+
+const lv = {
+    "Save": "Saglabāt",
+    "Uploading %(filename)s and %(count)s others|one": "Качване на %(filename)s и %(count)s друг",
+};
+
+// Fake languages.json containing references to en_EN, de_DE and lv
+// en_EN.json
+// de_DE.json
+// lv.json - mock version with few translations, used to test fallback translation
+
+function weblateToCounterpart(inTrs: object): object {
+    const outTrs = {};
+
+    for (const key of Object.keys(inTrs)) {
+        const keyParts = key.split('|', 2);
+        if (keyParts.length === 2) {
+            let obj = outTrs[keyParts[0]];
+            if (obj === undefined) {
+                obj = outTrs[keyParts[0]] = {};
+            } else if (typeof obj === "string") {
+                // This is a transitional edge case if a string went from singular to pluralised and both still remain
+                // in the translation json file. Use the singular translation as `other` and merge pluralisation atop.
+                obj = outTrs[keyParts[0]] = {
+                    "other": inTrs[key],
+                };
+                console.warn("Found entry in i18n file in both singular and pluralised form", keyParts[0]);
+            }
+            obj[keyParts[1]] = inTrs[key];
+        } else {
+            outTrs[key] = inTrs[key];
+        }
+    }
+
+    return outTrs;
+}
+
+fetchMock
+    .get("/i18n/languages.json", {
+        "en": {
+            "fileName": "en_EN.json",
+            "label": "English",
+        },
+        "de": {
+            "fileName": "de_DE.json",
+            "label": "German",
+        },
+        "lv": {
+            "fileName": "lv.json",
+            "label": "Latvian",
+        },
+    })
+    .get("end:en_EN.json", weblateToCounterpart(en))
+    .get("end:de_DE.json", weblateToCounterpart(de))
+    .get("end:lv.json", weblateToCounterpart(lv));
 
 languageHandler.setLanguage('en');
 languageHandler.setMissingEntryGenerator(key => key.split("|", 2)[1]);

test/setup/setupManualMocks.ts

@@ -45,6 +45,7 @@ global.matchMedia = mockMatchMedia;
 
 // maplibre requires a createObjectURL mock
 global.URL.createObjectURL = jest.fn();
+global.URL.revokeObjectURL = jest.fn();
 
 // polyfilling TextEncoder as it is not available on JSDOM
 // view https://github.com/facebook/jest/issues/9983