expect_same_number_of_rows: Check if a dataframe has the same number of rows as another,...
In dgarmat/expectdata: Test Expectations of a Data Frame

Description Usage Arguments Value Examples

Check if a dataframe has the same number of rows as another, or else 0 rows. If vectors are given, the lengths of the vectors are compared.

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expect_same_number_of_rows(df1, df2 = data.frame(),
  stop_if_fail = TRUE, report_rowcount = FALSE, return_df = TRUE,
  show_fails = TRUE)

`df1`	dataframe or vector to check (required)
`df2`	optional second dataframe or vector to compare (if not given, defaults to zero row data frame)
`stop_if_fail`	T/F for whether to consider failure an error
`report_rowcount`	T/F for whether to return the number of rows
`return_df`	T/F for whether to end function with dataframe 1 input (as in if a check in part of a pipe)
`show_fails`	T/F for whether to show head(df1) and/or head(df2) if it doesn't match. This can help with the next step of debugging why there is a mismatch.

several options depending on whether it fails or succeeeds

expect_same_number_of_rows(mtcars, mtcars)
[1] "Same number of rows...OK"

expect_same_number_of_rows(mtcars, iris)
                   mpg cyl disp  hp drat    wt  qsec vs am gear carb
Mazda RX4         21.0   6  160 110 3.90 2.620 16.46  0  1    4    4
Mazda RX4 Wag     21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
Datsun 710        22.8   4  108  93 3.85 2.320 18.61  1  1    4    1
Hornet 4 Drive    21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
Hornet Sportabout 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
Valiant           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1          5.1         3.5          1.4         0.2  setosa
2          4.9         3.0          1.4         0.2  setosa
3          4.7         3.2          1.3         0.2  setosa
4          4.6         3.1          1.5         0.2  setosa
5          5.0         3.6          1.4         0.2  setosa
6          5.4         3.9          1.7         0.4  setosa
Error:  Different number of rows: 32 vs: 150

expect_same_number_of_rows(mtcars, show_fails = FALSE)
Error:  Different number of rows: 32 vs: 0