Issue

The response header does not reflect the correct version for HTTP2 requests. Even though, wiremock replies in h2 but the version in the response header shows "HTTP/1.1 200". This is caused by the hardcoded value in the toString() method of Response.java class

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        **sb.append("HTTP

Right now ErrorMessageTest.testCustomMessage is written in a strange way.

• Instead of using assertThrows we're catching an exception.
• There is a custom fail() method that does nothing.
• We're not asserting anything, see sonar smell here[0]

https://github.com/fabric8io/kubernetes-client/blob/d1740ffeaa624bd63b6d929b25d764a477c1c17e/kubernetes-tests/src/test/java/io/fabric8/kubernete

Modify the test to start to use https://github.com/stretchr/testify instead of the native Go tests