autopkgtest fails in bionic

[Balint Reczey]

https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-bionic/bionic/amd64/r/r-cran-curl/20200921_121752_7738c@/log.gz

autopkgtest [12:17:11]: test run-unit-test: [-----------------------

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> library(testthat)
> library(curl)
>
> test_check("curl")
This is libcurl version 7.58.0 with OpenSSL/1.1.1
Using test server: http://hb.opencpu.org
-- 1. Error: Invalid domain raises an error (@test-certificates.R#16) ---------
SSL certificate problem: self signed certificate
1: expect_is(curl_fetch_memory(fake_url, handle = new_handle(ssl_verifyhost = FALSE))$status,
       "integer") at testthat/test-certificates.R:16
2: quasi_label(enquo(object), label)
3: eval_bare(get_expr(quo), get_env(quo))
4: curl_fetch_memory(fake_url, handle = new_handle(ssl_verifyhost = FALSE))

== testthat results ===========================================================
OK: 128 SKIPPED: 2 FAILED: 1
1. Error: Invalid domain raises an error (@test-certificates.R#16)

Error: testthat unit tests failed
Execution halted
autopkgtest [12:17:27]: test run-unit-test: -----------------------]
autopkgtest [12:17:27]: test run-unit-test: - - - - - - - - - - results - - - - - - - - - -
run-unit-test FAIL non-zero exit status 1