fix: change b3 injection format for b3 fetch and xml-http-request tests

Author: mwear

packages/opentelemetry-plugin-fetch/test/fetch.test.ts

@@ -218,7 +218,11 @@ describe('fetch', () => {
   });
 
   before(() => {
-    api.propagation.setGlobalPropagator(new core.B3Propagator());
+    api.propagation.setGlobalPropagator(
+      new core.B3Propagator({
+        injectEncoding: core.B3InjectEncoding.MULTI_HEADER,
+      })
+    );
   });
 
   describe('when request is successful', () => {

packages/opentelemetry-plugin-xml-http-request/test/xhr.test.ts

@@ -23,6 +23,7 @@ import {
   X_B3_TRACE_ID,
   isWrapped,
   NoopLogger,
+  B3InjectEncoding,
 } from '@opentelemetry/core';
 import { ZoneContextManager } from '@opentelemetry/context-zone';
 import * as tracing from '@opentelemetry/tracing';
@@ -143,7 +144,9 @@ describe('xhr', () => {
       });
 
       before(() => {
-        api.propagation.setGlobalPropagator(new B3Propagator());
+        api.propagation.setGlobalPropagator(
+          new B3Propagator({ injectEncoding: B3InjectEncoding.MULTI_HEADER })
+        );
       });
 
       describe('when request is successful', () => {