From 1ebc0ac43f18e6919dd98c1cb49934f24c9c1a81 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fabian=20Vi=C3=B6l?= <f.vioel@googlemail.com>
Date: Fri, 4 Jun 2021 23:40:00 +0200
Subject: [PATCH] Disable test harness for lib target

Without this change, if `testsuite/src/lib.rs` will be crated and `cargo
test` is invoked, cargo will try to link libtest with the crate.

As this crate is `no_std` and will usually be run for targets, where no
std library exists and therefor also no libtest, this will fail with an
error similar to this:

    error[E0463]: can't find crate for `test`

    error: aborting due to previous error

    For more information about this error, try `rustc --explain E0463`.
    error: could not compile `testsuite`

To circumvent this issue, disable the harness for lib as well.

Because the crates lib.rs is handled as a binary for test mode,
rust will look for a main function.
Add a minimal lib.rs, so that it will compile and run, when
test is invoked.
---
 testsuite/Cargo.toml | 3 +++
 testsuite/src/lib.rs | 7 +++++++
 2 files changed, 10 insertions(+)
 create mode 100644 testsuite/src/lib.rs

diff --git a/testsuite/Cargo.toml b/testsuite/Cargo.toml
index 5078a98..3567356 100644
--- a/testsuite/Cargo.toml
+++ b/testsuite/Cargo.toml
@@ -6,6 +6,9 @@ publish = false
 edition = "2018"
 version = "0.1.0"
 
+[lib]
+harness = false
+
 [[test]]
 name = "test"
 harness = false
diff --git a/testsuite/src/lib.rs b/testsuite/src/lib.rs
new file mode 100644
index 0000000..d4dd9ce
--- /dev/null
+++ b/testsuite/src/lib.rs
@@ -0,0 +1,7 @@
+#![no_std]
+#![cfg_attr(test, no_main)]
+
+use {{crate_name}} as _; // memory layout + panic handler
+
+#[defmt_test::tests]
+mod tests {}