More Test coverage + fix some code coverage bugs (#321)

Connection to the CI databases is viewed by Postgres as coming from localhost. The pg_hba.conf file generated by the docker image uses trust for these connections, that's why we had no test coverage on SASL and md5 branches.

This PR fixes this issue. There was also an issue with under-reporting code coverage. This should be fixed now

tests/docker/run.sh

@@ -1,21 +1,37 @@
 #!/bin/bash
 
+rm -rf /app/target/ || true
 rm /app/*.profraw || true
 rm /app/pgcat.profdata || true
 rm -rf /app/cov || true
 
-cd /app/
+export LLVM_PROFILE_FILE="/app/pgcat-%m-%p.profraw"
+export RUSTC_BOOTSTRAP=1
+export CARGO_INCREMENTAL=0
+export RUSTFLAGS="-Zprofile -Ccodegen-units=1 -Copt-level=0 -Clink-dead-code -Coverflow-checks=off -Zpanic_abort_tests -Cpanic=abort -Cinstrument-coverage"
+export RUSTDOCFLAGS="-Cpanic=abort"
 
+cd /app/
+cargo clean
 cargo build
 cargo test --tests
 
 bash .circleci/run_tests.sh
 
-rust-profdata merge -sparse pgcat-*.profraw -o pgcat.profdata
+TEST_OBJECTS=$( \
+    for file in $(cargo test --no-run 2>&1 | grep "target/debug/deps/pgcat-[[:alnum:]]\+" -o); \
+    do \
+        printf "%s %s " --object $file; \
+    done \
+)
 
-rust-cov export -ignore-filename-regex="rustc|registry" -Xdemangler=rustfilt -instr-profile=pgcat.profdata --object ./target/debug/pgcat --format lcov > ./lcov.info
+echo "Generating coverage report"
 
-genhtml lcov.info --output-directory cov --prefix $(pwd)
+rust-profdata merge -sparse /app/pgcat-*.profraw -o /app/pgcat.profdata
+
+bash -c "rust-cov export -ignore-filename-regex='rustc|registry' -Xdemangler=rustfilt -instr-profile=/app/pgcat.profdata $TEST_OBJECTS --object ./target/debug/pgcat --format lcov > ./lcov.info"
+
+genhtml lcov.info -show-details --highlight --ignore-errors source --legend  --output-directory cov --prefix $(pwd)
 
 rm /app/*.profraw
 rm /app/pgcat.profdata