sequenceDiagram
    participant Test as "Test Suite"
    participant Capture as "capture.ts"
    participant Mock as "Mock Page/CDP"
    
    Note over Test,Mock: NEW: Unit Tests for "computeFramePrefixes"
    
    Test->>Capture: computeFramePrefixes(page, context, perFrameMaps)
    
    loop For each child frame in context
        Capture->>Mock: getSessionForFrame(parentId)
        Capture->>Mock: send("DOM.getFrameOwner", { frameId: childId })
        
        alt Success (Same Process / Local Frame)
            Mock-->>Capture: { backendNodeId: 200 }
            Capture->>Capture: Look up XPath for node 200 in parent map
            Note right of Capture: e.g., "/html/body/iframe[1]"
            Capture->>Capture: Store AbsPrefix = ParentPrefix + IframeXPath
            Capture->>Capture: Map ChildFrame to EncodedHostID
        else Failure (OOPIF / Cross-Process)
            Mock-->>Capture: Error or Empty
            Capture->>Capture: Fallback: Inherit ParentPrefix
            Note right of Capture: No explicit host mapping created
        end
    end
    
    Capture-->>Test: Return { absPrefix, iframeHostEncByChild }

    Note over Test,Mock: NEW: Unit Tests for "mergeFramesIntoSnapshot"

    Test->>Capture: mergeFramesIntoSnapshot(maps, outlines, prefixes...)
    
    loop For each frame
        Capture->>Capture: Retrieve AbsPrefix for frame
        Capture->>Capture: Prefix all entries in XPath map
        Capture->>Capture: Merge URL/Scroll maps into root
    end

    Capture->>Capture: Identify Root Frame Outline
    
    loop For each child frame
        alt Parent Iframe Host Exists
            Capture->>Capture: Locate encoded ID in Parent Outline
            Capture->>Capture: Inject Child Outline into Parent Tree
            opt Multiple children same slot
                Capture->>Capture: Overwrite previous child (Last write wins)
            end
        else Orphaned / No Host Map
            Capture->>Capture: Skip tree injection
        end
    end

    Capture-->>Test: Return Combined Snapshot (Tree + Maps)