!5083 fix dateModified assertfail

Merge pull request !5083 from yangbo/xts_dateModified

multimedia/medialibrary/mediaLibrary_file/entry/src/main/ets/test/fileTestCallback.test.ets

@@ -146,7 +146,7 @@ export default function fileTestCallbackTest(abilityContext) {
                     fetchFileResult = await media.getFileAssets(idOP);
                     let newAsset = await fetchFileResult.getFirstObject();
                     expect(isNum(newAsset.dateModified)).assertTrue();
-                    expect(newAsset.dateModified != asset.dateModified).assertTrue()
+                    expect(newAsset.dateModified).assertEqual(asset.dateModified);
                     done();
                 });
             } catch (error) {

multimedia/medialibrary/mediaLibrary_file/entry/src/main/ets/test/fileTestPromise.test.ets

@@ -130,7 +130,7 @@ export default function fileTestPromiseTest(abilityContext) {
                 fetchFileResult = await media.getFileAssets(idOP);
                 let newAsset = await fetchFileResult.getFirstObject();
                 expect(isNum(newAsset.dateModified)).assertTrue();
-                expect(newAsset.dateModified != asset.dateModified).assertTrue()
+                expect(newAsset.dateModified).assertEqual(asset.dateModified);
                 done();
             } catch (error) {
                 console.info(`${testNum} failed error: ${error}`)