Co-authored-by: Kenneth Bandes <kbandes@google.com>

In generated unit tests checking behavior of required fields in REST transports, fields are given default values in accordance with the type of the field.

🤖 I have created a release \*beep\* \*boop\*
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### [0.58.2](https://www.github.com/googleapis/gapic-generator-python/compare/v0.58.1...v0.58.2) (2021-12-13)


### Bug Fixes

* fix case for expected field names in required fields test. ([#1107](https://www.github.com/googleapis/gapic-generator-python/issues/1107)) ([6a593f9](https://www.github.com/googleapis/gapic-generator-python/commit/6a593f9807141aaf6c13a8843804e9fa9b300c91))
* non-string required fields provide correct values ([#1108](https://www.github.com/googleapis/gapic-generator-python/issues/1108)) ([bc5f729](https://www.github.com/googleapis/gapic-generator-python/commit/bc5f729cf777d30e1053e23a1d115460952478af))
* syntax fix and test for multiple required fields ([#1105](https://www.github.com/googleapis/gapic-generator-python/issues/1105)) ([4e5fe2d](https://www.github.com/googleapis/gapic-generator-python/commit/4e5fe2db9d0d81929cc1559d3a134c9a38ae595c))
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