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Truncate the printed output when expect_equal_to_reference() fails #538

jennybc opened this Issue Nov 2, 2016 · 2 comments


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jennybc commented Nov 2, 2016

I used expect_equal_to_reference() for a deeply nested list. When this test fails, it prints >1K lines of this form:

Component X: Component Y: target is blah, current is yo

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hadley commented Dec 15, 2016

Could you please provide a small reprex?

@hadley hadley added the reprex label Dec 15, 2016


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jennybc commented Dec 15, 2016


x <- list(
  list(fruit = "apple", color = "red"),
  list(fruit = "grape", color = "green")

expect_equal_to_reference(x, "x.rds")

x <- x %>%
  map(function(x) {
    x$color <- sample(colors(), 1)
#> [[1]]
#> [[1]]$fruit
#> [1] "apple"
#> [[1]]$color
#> [1] "dodgerblue"
#> [[2]]
#> [[2]]$fruit
#> [1] "grape"
#> [[2]]$color
#> [1] "plum"

expect_equal_to_reference(x, "x.rds")
#> Error: `x` not equal to reference from `x.rds`.
#> Component 1: Component 2: 1 string mismatch
#> Component 2: Component 2: 1 string mismatch

I think you get one line of Component 2: Component 2: 1 string mismatch for every mismatch, no matter how many thousands there are.

My original context was roundtripping JSON: does the R object I get from httr::content() on a request match what I get after writing that list out to JSON and reading it back in. Apparently the answer is no and this is how I learned that. At very great length.

@hadley hadley added expectation feature and removed reprex labels Dec 15, 2016

@hadley hadley closed this in bd683c8 Dec 15, 2016

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