}

    /**
     * Adds one or more warnings to the given test
     *
     * @param testName the test name to add the warning
     * @param warnings the warning(s) to add
     */
    public void addWarning(String testName, String... warnings) {
        transformations.add(new InjectWarnings(Arrays.asList(warnings), testName));
    }

    /**
     * Adds one or more regex warnings to the given test
     *

              task.removeMatch("_source.blah")
              task.removeMatch("_source.junk", "two")
              task.addMatch("_source.added", [name: 'jake', likes: 'cheese'], "one")
              task.addWarning("one", "warning1", "warning2")
              task.addWarningRegex("two", "regex warning here .* [a-z]")
              task.addAllowedWarning("added allowed warning")

        .build()
    assertThat(headers["Test-Instant"]).isEqualTo("Thu, 01 Jan 1970 00:00:01 GMT")
    assertThat(headers.getInstant("Test-Instant")).isEqualTo(expected)
  }

  @Test fun addParsing() {
    val headers =
      Headers
        .Builder()
        .add("foo: bar")
        .add(" foo: baz") // Name leading whitespace is trimmed.
        .add("foo : bak") // Name trailing whitespace is trimmed.