use serde_json::Value as JsonValue;use crate::pull::PullEvent;// Convert a single JSON object representing a pull update into one or more events.pub(crate) fn pull_events_from_value(value: &JsonValue) -> Vec<PullEvent> {    let mut events = Vec::new();    if let Some(status) = value.get("status").and_then(|s| s.as_str()) {        events.push(PullEvent::Status(status.to_string()));        if status == "success" {            events.push(PullEvent::Success);        }    }    let digest = value        .get("digest")        .and_then(|d| d.as_str())        .unwrap_or("")        .to_string();    let total = value.get("total").and_then(JsonValue::as_u64);    let completed = value.get("completed").and_then(JsonValue::as_u64);    if total.is_some() || completed.is_some() {        events.push(PullEvent::ChunkProgress {            digest,            total,            completed,        });    }    events}#[cfg(test)]mod tests {    use assert_matches::assert_matches;    use super::*;    #[test]    fn test_pull_events_decoder_status_and_success() {        let v: JsonValue = serde_json::json!({"status":"verifying"});        let events = pull_events_from_value(&v);        assert_matches!(events.as_slice(), [PullEvent::Status(s)] if s == "verifying");        let v2: JsonValue = serde_json::json!({"status":"success"});        let events2 = pull_events_from_value(&v2);        assert_eq!(events2.len(), 2);        assert_matches!(events2[0], PullEvent::Status(ref s) if s == "success");        assert_matches!(events2[1], PullEvent::Success);    }    #[test]    fn test_pull_events_decoder_progress() {        let v: JsonValue = serde_json::json!({"digest":"sha256:abc","total":100});        let events = pull_events_from_value(&v);        assert_eq!(events.len(), 1);        assert_matches!(            &events[0],            PullEvent::ChunkProgress {                digest,                total,                completed,            } if digest == "sha256:abc" && total == &Some(100) && completed.is_none()        );        let v2: JsonValue = serde_json::json!({"digest":"sha256:def","completed":42});        let events2 = pull_events_from_value(&v2);        assert_eq!(events2.len(), 1);        assert_matches!(            &events2[0],            PullEvent::ChunkProgress {                digest,                total,                completed,            } if digest == "sha256:def" && total.is_none() && completed == &Some(42)        );    }}