session: migrate test-infra to testify for clustered_index_test

[tisonkun]

This closes #28323 .

Signed-off-by: tison [email protected]

Release note

None

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• lysu
• mmyj

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[tisonkun]

/cc @morgo @mmyj

[morgo]

It needs go fmt to be run:

[2021-10-18T05:39:56.307Z] gofmt (simplify)
[2021-10-18T05:40:08.517Z] session/clustered_index_test.go

[tisonkun]

@morgo updated.

Also go fmt ./... will introduce redundant change to this PR, see also #28903, it will change br/cmd/tidb-lightning-ctl/main.go also.

[mmyj]

lgtm

[lysu]

lgtm

[lysu]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: f6a4ed2

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