Some expected are not overwritten with BINDGEN_OVERWRITE_EXPECTED=1

STR:

1. Change some code in src/codegen/mod.rs related to the generating tests for layout
2. Try to overwrite expected

BINDGEN_OVERWRITE_EXPECTED=1 cargo test

3. Run the tests again

cargo test

Actual result:

failures:
test_mixed_header_and_header_contents
test_multiple_header_calls_in_builder

There no changes in appropriate files test_mixed_header_and_header_contents.rs and test_multiple_header_calls_in_builder.rs in tests/expectations/tests/

Expected result:
Tests are passed because expected files are overwritten

As I can see, we are regenerating expected files in fn compare_generated_header inside of macro_rules! test_header which is written to $OUT_DIR/out/tests.rs by build.rs. However, in build.rs we are applying this macro only to headers from tests/headers while test_mixed_header_and_header_contents.rs is generated manually from different headers in fn test_mixed_header_and_header_contents (tests/tests.rs). So, BINDGEN_OVERWRITE_EXPECTED=1 doesn't work here.

I've caught this bug in test_mixed_header_and_header_contents and test_multiple_header_calls_in_builder but I suppose it also affects all tests generated in tests/tests.rs manually.

Sorry, the codebase is a new for me, so I don't know how to fix it easily.

Read build.rs and tests/tests.rs, focusing on macro_rules! test_header, compare_generated_header, and the two named tests. Run BINDGEN_OVERWRITE_EXPECTED=1 cargo test followed by cargo test. Done means the manually generated tests overwrite their expectation files and the subsequent test run passes.