Go has a pretty comprehensive test suite for URI handling - https://go.dev/src/net/url/url_test.go. I know there is some spec testing in https://github.com/lambdaisland/uri/blob/main/test/lambdaisland/uri_test.cljc, but I think the Go tests cover more than that.
Would there be interest in porting their tests to uri, assuming the licenses are compatible?
Or perhaps more directly port more test suites from https://www.w3.org/wiki/UriTesting, or http://test.greenbytes.de/tech/tc/uris/