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// Copyright 2026 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package instance
import (
"errors"
"fmt"
)
// AggregateTestResults selects the most relevant result from a set of test runs.
// It prioritizes crashes, then successes (to ignore transient errors), then errors.
func AggregateTestResults(results []EnvTestResult) (*EnvTestResult, error) {
if len(results) == 0 {
return nil, fmt.Errorf("no env test runs")
}
var best *EnvTestResult
var bestRank int
for i := range results {
res := &results[i]
rank, preferLast := resultRank(res)
if best == nil {
best = res
bestRank = rank
continue
}
if rank > bestRank {
best = res
bestRank = rank
} else if rank == bestRank && preferLast {
best = res
}
}
return best, nil
}
const (
rankError = 1
rankSuccess = 2
rankCrash = 3 // Crash without report.
rankCrashReport = 4 // Crash with report.
)
// resultRank returns the rank of the result and whether we should prefer
// the last result (true) or first (false).
func resultRank(res *EnvTestResult) (int, bool) {
if res.Error == nil {
return rankSuccess, true
}
var crash *CrashError
if errors.As(res.Error, &crash) {
if crash.Report != nil && len(crash.Report.Report) > 0 {
return rankCrashReport, false
}
return rankCrash, false
}
return rankError, true
}
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