@Test
  void resolveTemplateWithHeaderEmptyResult() {
    RequestTemplate template =
        new RequestTemplate().method(HttpMethod.GET).header("Encoded", "{var}");

    template = template.resolve(mapOf("var", ""));

    assertThat(template).hasNoHeader("Encoded");
  }
This ensures we don't mess up vnd types
core/src/test/java/feign/RequestTemplateTest.java