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Swap inconsistent assert_eq! argument order in testing chapter #3497

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merged 2 commits into from
Jun 12, 2024
Merged

Swap inconsistent assert_eq! argument order in testing chapter #3497

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e58e314
Swap inconsistent `assert_eq!` argument order in testing chapter
regexident Jan 4, 2023
9a01b7c
Merge branch 'main' into swap-assert-eq-arg-order
chriskrycho Jun 12, 2024
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5 changes: 2 additions & 3 deletions listings/ch11-writing-automated-tests/no-listing-04-bug-in-add-two/output.txt
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Expand Up @@ -9,10 +9,9 @@ test tests::it_adds_two ... FAILED
failures:

---- tests::it_adds_two stdout ----
thread 'tests::it_adds_two' panicked at src/lib.rs:11:9:
assertion `left == right` failed
left: 4
right: 5
left: 5
right: 4
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


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2 changes: 1 addition & 1 deletion listings/ch11-writing-automated-tests/no-listing-04-bug-in-add-two/src/lib.rs
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Expand Up @@ -10,6 +10,6 @@ mod tests {

#[test]
fn it_adds_two() {
assert_eq!(4, add_two(2));
assert_eq!(add_two(2), 4);
}
}
2 changes: 1 addition & 1 deletion src/ch11-01-writing-tests.md
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Expand Up @@ -317,7 +317,7 @@ assertion functions are called `expected` and `actual`, and the order in which
we specify the arguments matters. However, in Rust, they’re called `left` and
`right`, and the order in which we specify the value we expect and the value
the code produces doesn’t matter. We could write the assertion in this test as
`assert_eq!(add_two(2), 4)`, which would result in the same failure message
`assert_eq!(4, add_two(2))`, which would result in the same failure message
that displays `` assertion failed: `(left == right)` ``.

The `assert_ne!` macro will pass if the two values we give it are not equal and
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