Fix some tests involving lazy or GPU

Author: sayomaki

src/commons/sagas/__tests__/BackendSaga.ts

@@ -832,8 +832,8 @@ describe('Test CHANGE_SUBLANGUAGE action', () => {
   test('when chapter is changed', () => {
     const sublang: SALanguage = {
       chapter: Chapter.SOURCE_4,
-      variant: Variant.GPU,
-      displayName: 'Source \xa74 GPU',
+      variant: Variant.CONCURRENT,
+      displayName: 'Source \xa74 Concurrent',
       mainLanguage: SupportedLanguage.JAVASCRIPT,
       supports: {}
     };
@@ -854,7 +854,7 @@ describe('Test CHANGE_SUBLANGUAGE action', () => {
         [
           call(putCourseConfig, mockTokens, {
             sourceChapter: Chapter.SOURCE_4,
-            sourceVariant: Variant.GPU
+            sourceVariant: Variant.CONCURRENT
           }),
           { ok: true }
         ]

src/commons/sagas/__tests__/PersistenceSaga.ts

@@ -20,7 +20,7 @@ const FILE_ID = '123';
 const FILE_NAME = 'file';
 const FILE_DATA = '// Hello world';
 const SOURCE_CHAPTER = Chapter.SOURCE_3;
-const SOURCE_VARIANT = Variant.LAZY;
+const SOURCE_VARIANT = Variant.DEFAULT;
 const SOURCE_LIBRARY = ExternalLibraryName.SOUNDS;
 
 beforeAll(() => {