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

    template.resolve(mapOf("dont_expand_me", "1234"));

    assertThat(template)
        .hasHeaders(entry("Encoded", Collections.singletonList("{{{{dont_expand_me}}")));
  }
Avoid depending on guava solely for map literals.
core/src/test/java/feign/RequestTemplateTest.java