build: add tests to template automation and clean up templating logic #1587
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chore: add tests to template automation and clean up templating logic
chore: add test fixtures and update tests
run test
Source-Link: googleapis/synthtool@ca63956
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:ebf1487fdb5be0d02d49a20b01547be3cd15cbd03f4ded7b47c65eae7920a080