#2 [harolei] Wrote the test of refresh the map when the land is sold or upgrade, and faked it.
#2 [harolei] Wrote the test and implement of refresh the map when the land is sold or upgrade.
#2 [harolei] Wrote the test and implement of refresh the map when the land is sold or upgrade， and refactor it.
#2 [harolei] Wrote the test and implement of refresh the map when the land is sold or upgrade， and refactor it.
#2 [harolei] Wrote the test and implement of refresh the map when the land is sold or upgrade， and refactor it.