n collectBenchesPerTestCase(entries) {
            const map = new Map();
            for (const entry of entries) {
              const {commit, date, tool, benches} = entry;
              for (const bench of benches) {
                const result = { commit, date, tool, bench };
                const arr = map.get(bench.name);
                if (arr === undefined) {
                  map.set(bench.name, [result]);
                } else {
                  arr.push(result);
                }
           