Fix flaky TestCreateZipFileAndAddFiles/write_one_file (#27737)

server/channels/app/file_test.go

@@ -321,13 +321,14 @@ func TestCreateZipFileAndAddFiles(t *testing.T) {
 	t.Run("write one file", func(t *testing.T) {
 		mockBackend := filesStoreMocks.FileBackend{}
 		mockBackend.On("WriteFile", mock.Anything, path.Join(directory, zipName)).Return(int64(666), nil).Run(func(args mock.Arguments) {
+			now := time.Now()
 			r, err := zip.OpenReader(zipName)
 			require.NoError(t, err)
 			require.Len(t, r.File, 1)
 
 			file := r.File[0]
 			assert.Equal(t, "file1", file.Name)
-			assert.GreaterOrEqual(t, file.Modified, time.Now().Add(-1*time.Second))
+			assert.GreaterOrEqual(t, file.Modified, now.Truncate(time.Second)) // Files are stored with a second precision
 
 			fr, err := file.Open()
 			require.NoError(t, err)