Greptile Summary

This PR extends the Startio bid adapter with test-mode support for publisher simulation environments, plus two minor data-mapping improvements. No structural changes to the bidding flow are made.

• Channel metadata: request.ext.prebid.channel is now populated with {name: 'pbjs', version: '$prebid.version$'} so the endpoint can identify the Prebid.js version making the call.
• placementId → imp.tagid: When params.placementId is provided, it is mapped (as a string) to imp.tagid in the OpenRTB impression, which is the standard field for placement identification.
• Test-mode flags: params.test sets request.test = 1 in the ORTB payload, and params.testAdsEnabled appends &testAdsEnabled=true to the endpoint URL so the SSP can return test creatives without affecting production billing.

Confidence Score: 5/5

The changes are additive and isolated to test-mode opt-in paths; production bid requests are unaffected unless a publisher explicitly sets the new params.

All three new features (channel metadata, tagid mapping, test flags) follow existing patterns in the adapter and only activate when the publisher sets the corresponding params. The getEndpointUrl helper correctly extends the already-querystring-bearing ENDPOINT_URL with &testAdsEnabled=true. A previously noted issue around request.test not being explicitly set to 0 in the default case is the only open gap, and it is confined to a test assertion rather than production behavior.

test/spec/modules/startioBidAdapter_spec.js — the expect(request.test).to.equal(0) assertion in the default case may behave differently depending on whether ortbConverter initializes the field.

Important Files Changed

Sequence Diagram

sequenceDiagram
    participant Page as Publisher Page
    participant Adapter as startioBidAdapter
    participant SSP as Start.io SSP

    Page->>Adapter: "buildRequests(bidRequests)<br/>params: {test, testAdsEnabled, placementId}"
    Adapter->>Adapter: "converter.toORTB()<br/>→ imp.tagid = placementId<br/>→ request.ext.prebid.channel = {pbjs, version}<br/>→ request.test = 1 (if params.test)"
    alt "params.testAdsEnabled = true"
        Adapter->>SSP: "POST /getbid?account=pbc&testAdsEnabled=true"
    else normal request
        Adapter->>SSP: "POST /getbid?account=pbc"
    end
    SSP-->>Adapter: BidResponse (test creatives or live)
    Adapter->>Page: interpretResponse → bids

_{Reviews (3): Last reviewed commit: "Enhance: Advertise Prebid channel name a..." | Re-trigger Greptile}