@Test
public void convertsEpochUnknownToNumber() {

    TimestampShape shape = TimestampShape.builder()
            .id("smithy.example#Timestamp")
            .addTrait(new TimestampFormatTrait("epoch-millis"))
            .build();
    Schema schema = new TimestampMapper().updateSchema(shape, Schema.builder(), new JsonSchemaConfig()).build();
    assertThat(schema.getType().get(), equalTo("number"));
    assertFalse(schema.getFormat().isPresent());
}