test_that("lazy_semi_join_query() checks arguments", {
  by0 <- list(x = "x", y = "x", x_as = ident("LHS"), y_as = ident("RHS"), na_matches = "never")
  lmod <- purrr::list_modify

  my_lazy_semi_join_query <- function(x = lazy_frame(x = 1, y = 2)$lazy_query,
                                      y = lazy_frame(x = 1, z = 2)$lazy_query,
                                      anti = FALSE,
                                      by = by0) {
    lazy_semi_join_query(
      x = x,
      y = y,
      vars = tibble(name = "x", var = "x"),
      anti = anti,
      by = by
    )
  }

  expect_snapshot(error = TRUE, {
    (my_lazy_semi_join_query(x = lazy_frame(x = 1)))
    (my_lazy_semi_join_query(y = lazy_frame(x = 1)))
  })

  expect_snapshot(error = TRUE, {
    (my_lazy_semi_join_query(by = lmod(by0, x = 1)))
  })

  expect_snapshot(error = TRUE, {
    (my_lazy_semi_join_query(anti = NA))
  })
})