Crate test_format

Test Debug and Display implementations (with no_std)

Testing of Debug and Display format implementations with support for no_std via assert_debug_fmt and assert_display_fmt macros.

std vs no_std

This crate builds in no_std mode by default.

Examples

Assume the following type Test that we will use to provide some test data:

struct Test<'a>(&'a str, char, &'a str);

use core::fmt::{Debug, Write};
use test_format::assert_debug_fmt;

impl<'a> Debug for Test<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        f.write_str(self.0)?;
        f.write_char(self.1)?;
        f.write_str(self.2)
    }
}

let input = Test("valid", ' ', "input");
assert_debug_fmt!(input, "valid input");

If the formatting fails, the assertion will fail:

let input = Test("valid", ' ', "inputs");
assert_debug_fmt!(input, "valid input"); // panics

Macros

assert_debug_fmt

Asserts that the Debug trait is correctly implemented.

assert_display_fmt

Asserts that the Display trait is correctly implemented.

Structs

AssertFormat

Functionality for testing Debug or Display implementations.