test: use t.Setenv
to set env vars in tests
#4169
Merged
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Which problem is this PR solving?
Short description of the changes
This PR replaces
os.Setenv
witht.Setenv
. Starting from Go 1.17, we can uset.Setenv
to set environment variable in test. The environment variable is automatically restored to its original value when the test and all its subtests complete. This ensures that each test does not start with leftover environment variables from previous completed tests.Reference: https://pkg.go.dev/testing#T.Setenv