Expectation: Are Two Datasets Equal? — expect_dfs

Uses diffdf::diffdf() to compares 2 datasets for any differences. This function can be thought of as an R-equivalent of SAS proc compare and a useful tool for unit testing as well.

Usage

expect_dfs_equal(base, compare, keys, ...)

Arguments

base: Input dataset
compare: Comparison dataset
keys: character vector of variables that define a unique row in the base and compare datasets
...: Additional arguments passed onto diffdf::diffdf()

Value

An error if base and compare do not match or NULL invisibly if they do

Examples

library(dplyr, warn.conflicts = FALSE)
library(tibble)

tbl1 <- tribble(
  ~USUBJID, ~AGE, ~SEX,
  "1001", 18, "M",
  "1002", 19, "F",
  "1003", 20, "M",
  "1004", 18, "F"
)

tbl2 <- tribble(
  ~USUBJID, ~AGE, ~SEX,
  "1001", 18, "M",
  "1002", 18.9, "F",
  "1003", 20, NA
)

try(expect_dfs_equal(tbl1, tbl2, keys = "USUBJID"))
#> Error : Differences found between the objects!
#> 
#> A summary is given below.
#> 
#> There are rows in BASE that are not in COMPARE !!
#> All rows are shown in table below
#> 
#>   =========
#>    USUBJID 
#>   ---------
#>     1004   
#>   ---------
#> 
#> Not all Values Compared Equal
#> All rows are shown in table below
#> 
#>   =============================
#>    Variable  No of Differences 
#>   -----------------------------
#>      AGE             1         
#>      SEX             1         
#>   -----------------------------
#> 
#> 
#> All rows are shown in table below
#> 
#>   ==================================
#>    VARIABLE  USUBJID  BASE  COMPARE 
#>   ----------------------------------
#>      AGE      1002     19    18.9   
#>   ----------------------------------
#> 
#> 
#> All rows are shown in table below
#> 
#>   ==================================
#>    VARIABLE  USUBJID  BASE  COMPARE 
#>   ----------------------------------
#>      SEX      1003     M     <NA>   
#>   ----------------------------------
#> 

tlb3 <- tribble(
  ~USUBJID, ~AGE, ~SEX,
  "1004", 18, "F",
  "1003", 20, "M",
  "1002", 19, "F",
  "1001", 18, "M",
)

# Note the sorting order of the keys is not required
expect_dfs_equal(tbl1, tlb3, keys = "USUBJID")