Add tests

Author: sarahchen6

dd-java-agent/testing/src/main/groovy/datadog/trace/agent/test/base/HttpClientTest.groovy

@@ -765,7 +765,7 @@ abstract class HttpClientTest extends VersionedNamingTestBase {
   def "test request header #header tag mapping"() {
     when:
     def url = server.address.resolve("/success")
-    def status = doRequest(method, url, [(header): value])
+    def status = (value2 == null) ? doRequest(method, url, [(header): value]) : doRequest(method, url, [(header): value, (header): value2])
     if (isDataStreamsEnabled()) {
       TEST_DATA_STREAMS_WRITER.waitForGroups(1)
     }
@@ -788,11 +788,13 @@ abstract class HttpClientTest extends VersionedNamingTestBase {
     }
 
     where:
-    method | header                           | value     | tags
-    'GET'  | 'X-Datadog-Test-Both-Header'     | 'foo'     | [ 'both_header_tag': 'foo' ]
-    'GET'  | 'X-Datadog-Test-Request-Header'  | 'bar'     | [ 'request_header_tag': 'bar' ]
-    'GET'  | 'X-Datadog-Test-Both-Header'     | 'bar,baz' | [ 'both_header_tag': 'bar,baz' ]
-    'GET'  | 'X-Datadog-Test-Request-Header'  | 'foo,bar' | [ 'request_header_tag': 'foo,bar' ]
+    method | header                           | value     | value2 | tags
+    'GET'  | 'X-Datadog-Test-Both-Header'     | 'foo'     | null   | [ 'both_header_tag': 'foo' ]
+    'GET'  | 'X-Datadog-Test-Request-Header'  | 'bar'     | null   | [ 'request_header_tag': 'bar' ]
+    'GET'  | 'X-Datadog-Test-Both-Header'     | 'bar,baz' | null   | [ 'both_header_tag': 'bar,baz' ]
+    'GET'  | 'X-Datadog-Test-Request-Header'  | 'foo,bar' | null   | [ 'request_header_tag': 'foo,bar' ]
+    'GET'  | 'X-Datadog-Test-Both-Header'     | 'foo'     | 'foo2' | [ 'both_header_tag': 'foo, foo2' ]
+    'GET'  | 'X-Datadog-Test-Request-Header'  | 'bar'     | 'bar2' | [ 'request_header_tag': 'bar, bar2' ]
   }
 
   def "test response header #header tag mapping"() {