Appears to have issues with CRLF line endings

[Alpvax]

I wish to test against a file with the line endings as CRLF, using expect_file
When I use UPDATE_EXPECT, the test passes, but if I then re-run the test, it fails, with no highlighted error characters.

[bjorn3]

Do you mean that the value which you are testing is a string containing a CRLF? In other words something like

use expect_test::expect;

#[test]
fn foo() {
    let actual = "foo\r\n";
    let expected = expect![[r#"
    foo
"#]];
    expected.assert_eq(&actual);
}

? Rust normalizes all strings from CRLF to LF, so expect_test will think that the test expectation is meant to use LF even if the source file contains CRLF. This then results in a mismatch between the actual (CRLF line endings) and expected (LF line endings) value. You can use .assert_debug_eq() instead of .assert_eq() to make the line endings get rendered as \r\n in the test expectation to avoid this normalization:

use expect_test::expect;

#[test]
fn foo() {
    let actual = "foo\r\n";
    let expected = expect![[r#"
        "foo\r\n"
    "#]];
    expected.assert_debug_eq(&actual);
}