Pull request #253: RUM-9059 Fixing HTTPClienTest for Java7

Merge in OP/openkit-java from feature/RUM-9059-mockito-4.x-update-destroyed-compatibility-with-java-7-for-open-kit-java to main

* commit '923e0932da7ec3711020378f886a407411ad1015':
  RUM-9059 Fixing HTTPClienTest for Java7

GitOrigin-RevId: 87bb8509b40aaeb4f82c8fcf425a9c7e73cbacd6

src/test7/java/com/dynatrace/openkit/protocol/HTTPClientTest.java

@@ -382,7 +382,8 @@ public void sendBeaconRequestAndEnsureContentLengthIsLengthOfCompressedSize() th
 
         // ensure that Content-Type and Content-Length were set
         verify(connection, times(1)).setRequestProperty("Content-Encoding", "gzip");
-        verify(connection, times(1)).setRequestProperty("Content-Length", Integer.toString(compressedText.length));
+        verify(connection, times(1)).setRequestProperty("Content-Type", "text/plain; charset=utf-8");
+        verify(connection, times(1)).setFixedLengthStreamingMode(compressedText.length);
 
         // ensure that the message body is as expected
         assertThat(os.toByteArray(), is(equalTo(compressedText)));