throws_error("Offset and length must be positive values."))
expect_that(fish$read(contentType = "text", offset = -1, length = -1),
throws_error("Offset and length must be positive values."))
throws_error("Offset and length must be positive values."))
expect_that(fish$read(contentType = "text", offset = -1, length = -1),
throws_error("Offset and length must be positive values."))