This is the only Cantonese Test I know, in HK.
https://www.lshk.org/cantonese-read-aloud-test
You might want to see the sample paper:
https://www.lshk.org/_files/ugd/508b98_3567f48037f1443c824277dacaa41fee.pdf
https://www.lshk.org/_files/ugd/508b98_a2d84c2701b44f7db1cd076f38e00e78.pdf
https://www.lshk.org/cantonese-read-aloud-test
You might want to see the sample paper:
https://www.lshk.org/_files/ugd/508b98_3567f48037f1443c824277dacaa41fee.pdf
https://www.lshk.org/_files/ugd/508b98_a2d84c2701b44f7db1cd076f38e00e78.pdf