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Implement #85440 (Random test ordering)
This PR adds `--shuffle` and `--shuffle-seed` options to `libtest`. The options are similar to the [`-shuffle` option](https://github.com/golang/go/blob/c894b442d1e5e150ad33fa3ce13dbfab1c037b3a/src/testing/testing.go#L1482-L1499) that was recently added to Go.
Here are the relevant parts of the help message:
```
--shuffle Run tests in random order
--shuffle-seed SEED
Run tests in random order; seed the random number
generator with SEED
...
By default, the tests are run in alphabetical order. Use --shuffle or set
RUST_TEST_SHUFFLE to run the tests in random order. Pass the generated
"shuffle seed" to --shuffle-seed (or set RUST_TEST_SHUFFLE_SEED) to run the
tests in the same order again. Note that --shuffle and --shuffle-seed do not
affect whether the tests are run in parallel.
```
Is an RFC needed for this?
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Co-authored-by: kennytm <kennytm@gmail.com>
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Show test type during prints
Test output can sometimes be confusing. For example doctest with the no_run argument are displayed the same way than test that are run.
During #83857 I got the feedback that test output can be confusing.
For the moment test output is
```
test $DIR/test-type.rs - f (line 12) ... ignored
test $DIR/test-type.rs - f (line 15) ... ok
test $DIR/test-type.rs - f (line 21) ... ok
test $DIR/test-type.rs - f (line 6) ... ok
```
I propose to change output by indicating the test type as
```
test $DIR/test-type.rs - f (line 12) ... ignored
test $DIR/test-type.rs - f (line 15) - compile ... ok
test $DIR/test-type.rs - f (line 21) - compile fail ... ok
test $DIR/test-type.rs - f (line 6) ... ok
```
by indicating the test type after the test name (and in the case of doctest after the function name and line) and before the "...".
------------
Note: this is a proof of concept, the implementation is probably not optimal as the properties added in `TestDesc` are only use in the display and does not represent actual change of behavior, maybe `TestType::DocTest` could have fields
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Pretty formatter when using multiple test threads displays test name twice on
timeout event. This implicitly suggest that those are two different events,
while in fact they are always printed together.
Print test name only once.
Before:
```
running 3 tests
test src/lib.rs - c (line 16) ... ok
test src/lib.rs - a (line 3) ... ok
test src/lib.rs - b (line 9) ... test src/lib.rs - b (line 9) has been running for over 60 seconds
test src/lib.rs - b (line 9) ... ok
```
After:
```
running 3 tests
test src/lib.rs - c (line 16) ... ok
test src/lib.rs - a (line 3) ... ok
test src/lib.rs - b (line 9) has been running for over 60 seconds
test src/lib.rs - b (line 9) ... ok
```
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Fixing escaping to ensure generation of welformed json.
doc tests' json name have a filename in them. When json test output is asked for on windows currently produces invalid json.
Tracking issue for json test output: #49359
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Modern compilers allow reaching external crates
like std or core via relative paths in modules
outside of lib.rs and main.rs.
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Found while working on https://github.com/rust-lang/rust/pull/77351;
these are just the ones that could be fixed automatically.
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