The `__FILE__` macro does not always get you an absolute path, so our
assumptions about it in test_data_util.cc were flawed.
If `foo.c` references `__FILE__`, something like `gcc -c foo.c`, will
define `__FILE__` as `"foo.c"`. If you use `gcc -c /path/to/foo.c`, then
`__FILE__` will be `"/path/to/foo.c"`.
The Ninja generator for CMake only generates absolute paths for source
files in certain CMake versions. (Exact range unknown.) Rather than
require newer CMake versions and depend on CMake's Ninja generator
maintaining the latest behavior forever, set the macro TEST_DATA_DIR to
point to the test data folder. This is consistent and never depends on
unspecified behavior.
This change will allow the use of the Ninja generator with older
versions of CMake, as found in most of our Docker builds.
This adds Mongoose as a third-party library, and builds on top of that
an embedded HTTP server for our unit tests.
We are using a fork of Mongoose pending the merging of this PR:
https://github.com/cesanta/mongoose/pull/2301
The embedded web server will make our HTTP-based tests independent of
httpbin.org, which will make them quick and reliable.
Rewrite test_data_util.cc to locate files relative to the source file
itself, rather than using a service from chromium `base::`.
Issue #1047 (CMake porting)
Issue #346 (absl porting)
Joey Parrish