PAAPI: emit addComponentAuction event

Component Auction Configs appear to be entirely contained within the
PAAPI + fledgeForGPT modules. This event provides a way to access
those configs from outside of those 2 modules.

src/adapters/bidderFactory.js

@@ -549,6 +549,7 @@ export const registerSyncInner = hook('async', function(spec, responses, gdprCon
 }, 'registerSyncs')
 
 export const addComponentAuction = hook('sync', (request, fledgeAuctionConfig) => {
+  events.emit(CONSTANTS.EVENTS.ADD_COMPONENT_AUCTION, request, fledgeAuctionConfig);
 }, 'addComponentAuction');
 
 // check that the bid has a width and height set

src/constants.json

@@ -51,7 +51,8 @@
     "BID_VIEWABLE": "bidViewable",
     "STALE_RENDER": "staleRender",
     "BILLABLE_EVENT": "billableEvent",
-    "BID_ACCEPTED": "bidAccepted"
+    "BID_ACCEPTED": "bidAccepted",
+    "ADD_COMPONENT_AUCTION": "addComponentAuction"
   },
   "AD_RENDER_FAILED_REASON": {
     "PREVENT_WRITING_ON_MAIN_DOCUMENT": "preventWritingOnMainDocument",

test/spec/unit/core/bidderFactory_spec.js

@@ -1588,4 +1588,29 @@ describe('bidderFactory', () => {
       });
     })
   });
+
+  describe('addComponentAuction', () => {
+    let requestStub
+    let fledgeAuctionConfigStub
+    let eventEmitterSpy
+
+    beforeEach(() => {
+      eventEmitterSpy = sinon.spy(events, 'emit');
+      requestStub = sinon.stub();
+      fledgeAuctionConfigStub = sinon.stub();
+    })
+
+    afterEach(() => {
+      eventEmitterSpy.restore();
+    })
+
+    it(`should emit an addComponentAuction event`, () => {
+      addComponentAuction(requestStub, fledgeAuctionConfigStub);
+      const eventCall = eventEmitterSpy.withArgs(CONSTANTS.EVENTS.ADD_COMPONENT_AUCTION).getCalls()[0];
+      const [event, request, fledgeAuctionConfig] = eventCall.args;
+      assert.equal(event, CONSTANTS.EVENTS.ADD_COMPONENT_AUCTION)
+      assert.equal(request, requestStub);
+      assert.equal(fledgeAuctionConfig, fledgeAuctionConfigStub);
+    })
+  });
 })