Enable only unicode / utf8 string tests

Author: MarkDuckworth

packages/firestore/test/integration/api/database.test.ts

@@ -2433,7 +2433,7 @@ apiDescribe('Database', persistence => {
     });
   });
 
-  describe('Sort unicode strings', () => {
+  describe.only('Sort unicode strings', () => {
     const expectedDocs = [
       'b',
       'a',

packages/firestore/test/unit/util/misc.test.ts

@@ -54,7 +54,7 @@ describe('FieldMask', () => {
   });
 });
 
-describe('CompareUtf8Strings', () => {
+describe.only('CompareUtf8Strings', () => {
   it('compareUtf8Strings should return correct results', () => {
     const errors = [];
     const seed = Math.floor(Math.random() * Number.MAX_SAFE_INTEGER);