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3b8bf85fbc
Before this commit, if a test file or a test suite didn't include
any actual test cases, it was ignored by `boost_test_tree_lister`.
However, this information is useful; for example, it allows us to tell
if the test file the user wants to run doesn't exist or simply doesn't
contain any tests. The kind of error we would return to them should be
different depending on which situation we're dealing with.
We start including those empty suites and files in the output of
`--list_json_content`.
---
Examples (with additional formatting):
* Consider the following test file, `test/boost/dummy_test.cc` [1]:
```
BOOST_AUTO_TEST_SUITE(dummy_suite1)
BOOST_AUTO_TEST_SUITE(dummy_suite2)
BOOST_AUTO_TEST_SUITE_END()
BOOST_AUTO_TEST_SUITE_END()
BOOST_AUTO_TEST_SUITE(dummy_suite3)
BOOST_AUTO_TEST_SUITE_END()
```
Before this commit:
```
$ ./build/debug/test/boost/dummy_test -- --list_json_content
[{"file": "test/boost/dummy_test.cc", "content": {"suites": [], "tests": []}}]
```
After this commit:
```
$ ./build/debug/test/boost/dummy_test -- --list_json_content
[{"file":"test/boost/dummy_test.cc", "content": {"suites": [
{"name": "dummy_suite1", "suites": [
{"name": "dummy_suite2", "suites": [], "tests": []}
], "tests": []},
{"name": "dummy_suite3", "suites": [], "tests": []}
], "tests": []}}]
```
* Consider the same test file as in Example 1, but also assume it's compiled
into `test/boost/combined_tests`.
Before this commit:
```
$ ./build/debug/test/boost/combined_tests -- --list_json_content | grep dummy
$
```
After this commit:
```
$ ./build/debug/test/boost/combined_tests -- --list_json_content
[..., {"file": "test/boost/dummy_test.cc", "content": {"suites": [
{"name": "dummy_suite1", "suites":
[{"name": "dummy_suite2", "suites": [], "tests": []}],
"tests": []},
{"name": "dummy_suite3", "suites": [], "tests": []}],
"tests":[]}}, ...]
```
[1] Note that the example is simplified. As of now, it's not possible to use
`--list_json_content` with a file without any Boost tests. That will
result in the following error: `Test setup error: test tree is empty`.
Refs scylladb/scylladb#25415