"Helper function for successive difference quadratic forms works correctly"
"Helper function for SRSWOR quadratic forms works correctly"
"Generates correct quadratic form for Horvitz-Thompson"
"Horvitz-Thompson estimate matches the 'survey' package"
"Generates correct quadratic form for Yates-Grundy"
"`make_quad_form_matrix()` works correctly for 'SD1' and 'SD2' with stratified single-stage samples"
"`make_quad_form_matrix()` with 'SD1' and 'SD2' works correctly when data frame isn't sorted"
"successive-differences estimate less than ST-SRSWOR approximation, for sys sample from sorted frame"
"Fills in implicit cluster or strata IDs"
"Correct results for stratified multistage SRS"
"Correct results for Deville-1 and Deville-2"
"Deville-Tille quadratic form gives expected estimate"
"`made-up` is not a supported variance estimator"
"must supply a matrix or data frame to `cluster_ids`"
"matrix or data frame to `strata_pop_sizes`"
"must supply a matrix or data frame to `probs`"
"Must set `rows=TRUE` and/or `cols=TRUE`"