`assert_eq!` should show a diff for failing asserts
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C-feature-request
T-libs
- Dominant language
- Rust
- Stars
- 119k
- Forks
- 16.1k
- PR merge metrics
- PR metrics pending
Description
Problem
When an assert_eq! in a test fails, the differences between left and right are very hard to see.
Proposed Solution
cargo test should show a diff, when an assert_eq! fails.
Notes
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing a failing assert_eq! with cargo test and trace how the failure output is produced. Identify the relevant implementation and tests in the Rust repository; the work is done when failing equality assertions show a useful diff without regressing existing test output.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- testing-qa
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100