diff --git a/.github/workflows/oss-image.yml b/.github/workflows/oss-image.yml
index e8541f82..3e867b6f 100644
--- a/.github/workflows/oss-image.yml
+++ b/.github/workflows/oss-image.yml
@@ -63,9 +63,11 @@ jobs:
           docker run --rm --memory=4g --cpus=2 --network=none \
             --env NODE_ENV=test --env READER_MAX_WORKERS=2 \
             --mount "type=bind,source=$GITHUB_WORKSPACE/tests,target=/app/tests,readonly" \
+            --mount "type=bind,source=$GITHUB_WORKSPACE/fixtures,target=/app/fixtures,readonly" \
             --tmpfs /app/tests-build:mode=1777 \
             --entrypoint sh reader-candidate:"$GITHUB_SHA" \
-            -c 'npm run test:futurity && npm test'
+            -c 'npm run test:futurity && npm test' 2>&1 | tee "$RUNNER_TEMP/reader-tests.log"
+          node futurity/assert-test-results.cjs "$RUNNER_TEMP/reader-tests.log"
       - name: Check container startup
         run: |
           docker run --rm --memory=2g --cpus=2 --network=none \
diff --git a/futurity/assert-test-results.cjs b/futurity/assert-test-results.cjs
new file mode 100644
index 00000000..c39d5220
--- /dev/null
+++ b/futurity/assert-test-results.cjs
@@ -0,0 +1,16 @@
+const fs = require('node:fs');
+
+const output = fs.readFileSync(process.argv[2], 'utf8').replace(/\x1b\[[0-9;]*m/g, '');
+const counts = (name) => [...output.matchAll(new RegExp(`^ℹ ${name} (\\d+)$`, 'gm'))]
+  .map((match) => Number(match[1]));
+const tests = counts('tests');
+const passed = counts('pass');
+const failed = counts('fail');
+const cancelled = counts('cancelled');
+if ([tests, passed, failed, cancelled].some((values) => values.length !== 3)
+    || tests.some((count, index) => count === 0 || passed[index] !== count)
+    || failed.some(Boolean) || cancelled.some(Boolean)) {
+  console.error('Reader regression summaries are incomplete or contain failures.');
+  process.exit(1);
+}
+console.log(`Verified ${passed.reduce((sum, count) => sum + count, 0)} passing regressions.`);