@Test public void parse_emptyValuesOk() {

  for (String emptyValue : Arrays.asList("k1=", "k1 =", ",k1=", ",k1 =", "k1 =,")) {
    entrySplitter.parse(parseIntoMap, map, emptyValue);
    assertThat(map).containsExactly(entry("k1", ""));
    map.clear();
  }
  entrySplitter.parse(parseIntoMap, map, "k1=v1,k2=");
  assertThat(map).containsExactly(
      entry("k1", "v1"),
      entry("k2", "")
  );
}