print messages in tests breaks reporting

[katrinabrock]

Summary

When there are print messages directly in the test_that statement, reporter does not successfully push test results to VSCode nor does this out appear in the output tab.

MRE

Run the tests found in this file:
https://github.com/katrinabrock/minimal-r-package/blob/340306dac9bb73386882f0e8554d28cf78b54d95/tests/testthat/test-output.R (note: not the most recent version)

Expected result

Results successfully recorded in test reporter:

Output tab contains:

Message #1
Message #2

Actual result

Tests appear in reporter as though they haven't run:

No output in output tab.

Note: R output looks like this:

> devtools::load_all('/home/TOP/kbrock/.vscode-server/extensions/meakbiyik.vscode-r-test-adapter-0.7.0/src/testthat/reporter')
ℹ Loading vscodereporter
> l<-testthat::test_file('/home/TOP/kbrock/minimal-r-package/tests/testthat/test-output.R', reporter=VSCodeReporter)
{"type":"start_reporter"}
{"type":"start_file","filename":"test-output.R"}
{"type":"start_test","test":"Output Test #1"}
[1] "Message #1"
{"type":"add_result","context":{},"test":"Output Test #1","result":"success","location":"test-output.R:4:3","filename":"test-output.R"}
{"type":"end_test","test":"Output Test #1"}
{"type":"start_test","test":"Output Test #2"}
[1] "Message #2"
{"type":"add_result","context":{},"test":"Output Test #2","result":"failure","location":"test-output.R:9:3","filename":"test-output.R","message":"FALSE is not TRUE\n\n`actual`:   \u001b[32mFALSE\u001b[39m\n`expected`: \u001b[32mTRUE\u001b[39m "}
{"type":"end_test","test":"Output Test #2"}
{"type":"end_file","filename":"test-output.R"}
{"type":"end_reporter"}