public static MapBuilder<Schema> map() {
    return builder().map();
  }
@Test
  void map() {
    Schema intSchema = Schema.create(Schema.Type.INT);
    Schema expected = Schema.createMap(intSchema);

    Schema schema1 = SchemaBuilder.map().values().intType();
    assertEquals(expected, schema1);

    Schema schema2 = SchemaBuilder.map().values(intSchema);
    assertEquals(expected, schema2);

    Schema schema3 = SchemaBuilder.map().prop("p", "v").values().type("int");
    expected.addProp("p", "v");
    assertEquals(expected, schema3);
  }