Clarify that integration tests go in tests/

"External" is a bit confusing. Then if we say where integration tests
go, that might make someone wonder where the unit tests go, so I added a
note about unit tests.

diff --git a/src/doc/guide.md b/src/doc/guide.md
index 00cd86deb7da480a0358f815cb564cb003fb4d19..ffd96005a891d7a895a89b5dcac9c7eb0c273b27 100644 (file)
--- a/src/doc/guide.md
+++ b/src/doc/guide.md
@@ -216,7 +216,7 @@ Cargo project:
 * The default library file is `src/lib.rs`.
 * The default executable file is `src/main.rs`.
 * Other executables can be placed in `src/bin/*.rs`.
-* External tests go in the `tests` directory.
+* Integration tests go in the `tests` directory (unit tests go in each file they're testing).
 * Example executable files go in the `examples` directory.
 * Benchmarks go in the `benches` directory.