Adf adapter: add coppa signal support (prebid#8375)

* Coppa signal support in adf adapter

* Update

Co-authored-by: Justas Pupelis <justas.pupelis@adform.com>

modules/adfBidAdapter.js

@@ -206,6 +206,11 @@ export const spec = {
       request.is_debug = !!test;
       request.test = 1;
     }
+
+    if (config.getConfig('coppa')) {
+      deepSetValue(request, 'regs.coppa', 1);
+    }
+
     if (deepAccess(bidderRequest, 'gdprConsent.gdprApplies') !== undefined) {
       deepSetValue(request, 'user.ext.consent', bidderRequest.gdprConsent.consentString);
       deepSetValue(request, 'regs.ext.gdpr', bidderRequest.gdprConsent.gdprApplies & 1);

test/spec/modules/adfBidAdapter_spec.js

@@ -178,6 +178,33 @@ describe('Adf adapter', function () {
       assert.equal(request.source.fd, 1);
     });
 
+    it('should not set coppa when coppa is not provided or is set to false', function () {
+      config.setConfig({
+      });
+      let validBidRequests = [{ bidId: 'bidId', params: { test: 1 } }];
+      let bidderRequest = { gdprConsent: { gdprApplies: true, consentString: 'consentDataString' }, refererInfo: { referer: 'page' } };
+      let request = JSON.parse(spec.buildRequests(validBidRequests, bidderRequest).data);
+
+      assert.equal(request.regs.coppa, undefined);
+
+      config.setConfig({
+        coppa: false
+      });
+      request = JSON.parse(spec.buildRequests(validBidRequests, bidderRequest).data);
+
+      assert.equal(request.regs.coppa, undefined);
+    });
+
+    it('should set coppa to 1 when coppa is provided with value true', function () {
+      config.setConfig({
+        coppa: true
+      });
+      let validBidRequests = [{ bidId: 'bidId', params: { test: 1 } }];
+      let request = JSON.parse(spec.buildRequests(validBidRequests, { refererInfo: { referer: 'page' } }).data);
+
+      assert.equal(request.regs.coppa, 1);
+    });
+
     it('should send info about device', function () {
       config.setConfig({
         device: { w: 100, h: 100 }