Coverage measures the page's Node tests and runs the Rust on Postgres (#407)

page-unit.ts and native-bridge.ts run the page's script outside a
browser, so the page's coverage counted none of what they test, and
native.ts read as mostly untested. In a coverage run they now run the
script from a file of its own, named as the browser names it, under
NODE_V8_COVERAGE (scripts/coverage-node.sh, before the browser suite in
npm run coverage:page and coverage.sh api), and the report's teardown
takes their record in, mapped to web/src by the build's source map: the
page's lines went from 73.3% to 80.0% of 3,043, native.ts to 93 of 120.

The cargo tests in coverage.sh's container run on Postgres, as
production does, when IPX_TEST_DATABASE_URL names the _test database,
from the shell or else /src/.envrc (that variable only); on SQLite
without it. The integration tests' own files are left out of the
totals; a crate's inline mod tests cannot be on stable Rust.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/coverage.sh

@@ -14,6 +14,11 @@
 # it, say so and leave the cap be. The browser suite runs here, as it always does, its servers the
 # container's build: the image is Ubuntu's, as code-server is, so they start here.
 #
+# The cargo tests run on Postgres, production's database, when IPX_TEST_DATABASE_URL names the
+# _test one (#407), from the shell or else /src/.envrc; on SQLite without it, whose paths are then
+# the only ones measured. The integration tests' own files (tests/) are left out of the totals;
+# a crate's inline `mod tests` cannot be, on stable Rust.
+#
 # Reports: target/coverage/cargo and target/coverage/api (summary.txt, a line a file; lcov.info;
 # html/index.html), target/coverage/page (npm run coverage:page's, or api's). Each run ends by
 # writing the numbers for Grafana (scripts/coverage-metrics.ts).
@@ -35,6 +40,13 @@ LLVM_TARGET=$TARGET/llvm-cov-target
 
 cd "$(dirname "$0")/.."
 
+# Only the one variable, not the whole file: it holds keys the tests are not to see.
+if [ -z "${IPX_TEST_DATABASE_URL:-}" ] && [ -f /src/.envrc ]; then
+  IPX_TEST_DATABASE_URL=$(sed -n 's/^export IPX_TEST_DATABASE_URL=//p' /src/.envrc | tr -d "\"'")
+fi
+export IPX_TEST_DATABASE_URL="${IPX_TEST_DATABASE_URL:-}"
+[ -n "$IPX_TEST_DATABASE_URL" ] && echo "the cargo tests run on Postgres (IPX_TEST_DATABASE_URL)"
+
 room() {
   avail=$(awk '/^MemAvailable:/ {print $2}' /proc/meminfo)
   load=$(cut -d' ' -f1 /proc/loadavg)
@@ -55,6 +67,7 @@ run() {
   docker run --rm --memory "$MEM" --memory-swap "$MEM" --cpuset-cpus "$CPUS" \
     -v "$SRC:/work:ro" -v "$TARGET:/target" -v "$REGISTRY:/usr/local/cargo/registry" \
     -e CARGO_TARGET_DIR=/target/llvm-cov-target -e CARGO_LLVM_COV_TARGET_DIR=/target/llvm-cov-target \
+    -e IPX_TEST_DATABASE_URL \
     "$IMAGE" "$@" || {
       code=$?
       [ "$code" -eq 137 ] && echo "killed at the ${MEM} memory cap: tell the user, do not raise it" >&2
@@ -66,9 +79,10 @@ run() {
 report() {
   room
   mkdir -p "$TARGET/coverage/$1"
-  run sh -c "cargo llvm-cov report --lcov --output-path /target/coverage/$1/lcov.info \
-    && cargo llvm-cov report --html --output-dir /target/coverage/$1 \
-    && cargo llvm-cov report --summary-only > /target/coverage/$1/summary.txt"
+  skip="--ignore-filename-regex '(^|/)tests/'"
+  run sh -c "cargo llvm-cov report $skip --lcov --output-path /target/coverage/$1/lcov.info \
+    && cargo llvm-cov report $skip --html --output-dir /target/coverage/$1 \
+    && cargo llvm-cov report $skip --summary-only > /target/coverage/$1/summary.txt"
   # The paths inside the container are /work/...; the tree's own, from here.
   sed -i 's#/work/##' "$TARGET/coverage/$1/summary.txt" "$TARGET/coverage/$1/lcov.info"
   tail -1 "$TARGET/coverage/$1/summary.txt"
@@ -91,6 +105,7 @@ if [ "${1:-}" = api ]; then
   # Not `set -e`'s to stop on: a failing test still ran what it ran, and the report says so; the
   # suite's own exit code is this script's at the end.
   suite=0
+  sh scripts/coverage-node.sh
   IPX_API_COVERAGE=$LLVM_TARGET IPX_COVERAGE=1 IPX_SIGNALS_TESTS=1 LLVM_PROFILE_FILE="$LLVM_TARGET/ipx-browser-%p-%14m.profraw" \
     npx playwright test || suite=$?
   ls "$LLVM_TARGET"/ipx-browser-*.profraw >/dev/null 2>&1 \