improve tests, especially for navigation.

__mocks__/api.ts

@@ -14,6 +14,9 @@ class LanguageServer {
       "es": { code: "es", name: "Spanish", targets: ['fr', 'en'] },
     }
   }
+  static getDefault() {
+    return new LanguageServer("http://localhost:5002");
+  }
 }
 
 class Translator {
@@ -21,6 +24,9 @@ class Translator {
   translate(message : string, target : string) {
     return message;
   }
+  static getDefault(code : string) {
+    return new Translator(code);
+  }
 }
 
 class CachedTranslator extends Translator{

__mocks__/db.ts

@@ -0,0 +1,10 @@
+export default {
+  getDb: jest.fn(() => {
+    return {
+      runAsync: jest.fn((statement: string, value: string) => {}),
+      getFirstAsync: jest.fn((statement: string, value: string) => {
+        return [];
+      }),
+    };
+  }),
+};

__mocks__/settings.ts

@@ -0,0 +1,16 @@
+const originalModule = jest.requireActual("@/app/lib/settings");
+class MockSettings {
+  public constructor(public db = {}) {}
+  public setHostLanguage = jest.fn((val: string) => {});
+  public setLibretranslateBaseUrl(val: string) {}
+  getHostLanguage = jest.fn(() => {
+    return "en";
+  });
+  getLibretranslateBaseUrl = jest.fn(() => {
+    return "http://localhost:5004";
+  });
+}
+export default {
+  ...originalModule,
+  Settings: MockSettings,
+};