fs: Replace os.Setenv() usage in testing with (testing.T).Setenv() #45
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Reference: https://pkg.go.dev/testing#T.Setenv Added in Go 1.17. It will automatically reset the environment variable after each test.
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Reference: https://pkg.go.dev/testing#T.Setenv
Added in Go 1.17. It will automatically reset the environment variable after each test.