This provides two convenience macros to make tests with easy to understand failure messages from simple Rust expressions.
assertify!(expr)Generates an assertion for expr with a friendly failure message. If expr is
a binary expression, the actual value should be on the left and the expected
value should be on the right.
```rust
fn simple_eq() { assertify!(1 + 2 == 0); } ```
---- tests::simple_eq stdout ----
thread 'tests::simple_eq' panicked at 'failed: 1 + 2 == 0
actual: 3
expected: == 0
', src/lib.rs:98:9
This is a major improvement over the message generated by assert_eq!, since
the failure message shows what the failed expression was.
```rust
fn simpleeqtraditional() { assert_eq!(1 + 2, 0); } ```
``
---- tests::simple_eq_traditional stdout ----
thread 'tests::simple_eq_traditional' panicked at 'assertion failed:(left == right)
left:3,
right:0`', src/lib.rs:103:9
```
testify!(name, expr)Generates a test function named name that asserts that expr is true.
rust
testify!(concat_literals, concat("a", "b") == "ab");
Again, the failure messages are easy to understand:
---- tests::concat_literals stdout ----
thread 'tests::concat_literals' panicked at 'failed: concat("a", "b") == "aX"
actual: "ab"
expected: == "aX"
', src/lib.rs:106:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
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