How do I configure Magento ≥ 2.2 for testing?

Development
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2

Step 1

UPDATE `sales_sequence_profile` SET suffix = '-DF';

Step 2

bin/magento config:set design/head/demonotice 1
bin/magento config:set dev/css/merge_css_files 1
bin/magento config:set dev/css/minify_files 0
bin/magento config:set dev/js/enable_js_bundling 1
bin/magento config:set dev/js/merge_files 1
bin/magento config:set dev/js/minify_files 0
bin/magento config:set dev/static/sign 1
bin/magento cache:clean
3

See also: How do I configure Magento for development?