CODEWITHSUNDEEP
unit-testingtestingrustrust-cargo
user1413793
user1413793

Reputation: 9347

Compile specific tests into binary

I would like to compile a binary which runs a certain subset of tests. When I run the following, it works:

ubuntu@ubuntu-xenial:/ox$ cargo test hash::vec
    Finished dev [unoptimized + debuginfo] target(s) in 0.11 secs
     Running target/debug/deps/ox-824a031ff1732165

running 9 tests
test hash::vec::test_hash_entry::test_get_offset_tombstone ... ok
test hash::vec::test_hash_entry::test_get_offset_value ... ok
test hash::vec::test_hash_table::test_delete ... ok
test hash::vec::test_hash_table::test_delete_and_set ... ok
test hash::vec::test_hash_table::test_get_from_hash ... ok
test hash::vec::test_hash_table::test_get_non_existant_from_hash ... ok
test hash::vec::test_hash_table::test_override ... ok
test hash::vec::test_hash_table::test_grow_hash ... ok
test hash::vec::test_hash_table::test_set_after_filled_with_tombstones ... ok

test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 8 filtered out

When I try to run target/debug/deps/ox-824a031ff1732165, it runs all my tests, not just the 9 specified in hash::vec.

I've tried to run cargo rustc --test hash::vec but I get error: no test target namedhash::vec.cargo rustc -- --testworks, but creates a binary that runs all tests. If I trycargo rustc -- --test hash::vec`, I get:

   Compiling ox v0.1.0 (file:///ox)
error: multiple input filenames provided

error: Could not compile `ox`.

cargo rustc -h says that you can pass NAME with the --test flag (--test NAME Build only the specified test target), so I'm wondering what "NAME" is and how to pass it in so I get a binary that only runs the specified 9 tests in hash::vec.

Upvotes: 0

Views: 1028

Answers (2)

Alen Siljak
Alen Siljak

Reputation: 2595

This functionality has found its way into Cargo. cargo build now has a parameter

 --test [<NAME>]           Build only the specified test target

which builds a binary with the specified set of tests only.

Upvotes: -1

DK.
DK.

Reputation: 59155

You can't, at least not directly.

In the case of cargo test hash::vec, the hash::vec is just a substring matched against the full path of each test function when the test runner is executed. That is, it has absolutely no impact whatsoever on which tests get compiled, only on which tests run. In fact, this parameter is passed to the test runner itself; Cargo doesn't even interpret it itself.

In the case of --test NAME, NAME is the name of the test source. As in, passing --test blah tells Cargo to build and run the tests in tests/blah.rs. It's the same sort of argument as --bin NAME (for src/bin/NAME.rs) and --example NAME (for examples/NAME.rs).

If you really want to only compile a particular subset of tests, the only way I can think of is to use conditional compilation via features. You'd need a package feature for each subset of tests you want to be able to enable/disable.

Upvotes: 3

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