Extend test coverage (#505)

* increase test coverage

* add error for compact sequence, add serialize test

* change imports

* add dns verifier tests

* disable codecov comments

* add tests to id conversion

* use actual fqdn

* rm unused line

* use checkout v4

* add support for multiple digests, extend testing

* add test for missing header, use oneshot where possible

* move tests

* add redis test

* add graphql tests

* order tests

* up

* add decode test

* add encode and serialise tests, use btreeset for determinism

* test to_owned impl

* rename test

.github/workflows/coverage.yml

@@ -36,7 +36,7 @@ jobs:
           --health-retries 5
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - name: Install cargo-nextest
         uses: taiki-e/install-action@nextest
@@ -50,6 +50,5 @@ jobs:
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v3
         with:
-          #token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos
           files: lcov.info
           fail_ci_if_error: true