58 lines
1.6 KiB
Rust
58 lines
1.6 KiB
Rust
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//! Conditionally compiling tests with std and our executable with no_std.
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//!
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//! Rust's built in unit testing framework requires the standard library,
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//! but we need to build our final executable with no_std.
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//! The testing framework also generates a `main` method, so we need to only use the `#[entry]`
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//! annotation when building our final image.
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//! For more information on why this example works, see this excellent blog post.
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//! https://os.phil-opp.com/unit-testing/
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//!
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//! Running this example:
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//!
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//! Ensure there are no targets specified under `[build]` in `.cargo/config`
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//! In order to make this work, we lose the convenience of having a default target that isn't the
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//! host.
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//!
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//! cargo build --example test_on_host --target thumbv7m-none-eabi
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//! cargo test --example test_on_host
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#![cfg_attr(test, allow(unused_imports))]
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#![cfg_attr(not(test), no_std)]
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#![cfg_attr(not(test), no_main)]
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// pick a panicking behavior
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#[cfg(not(test))]
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extern crate panic_halt; // you can put a breakpoint on `rust_begin_unwind` to catch panics
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// extern crate panic_abort; // requires nightly
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// extern crate panic_itm; // logs messages over ITM; requires ITM support
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// extern crate panic_semihosting; // logs messages to the host stderr; requires a debugger
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use cortex_m::asm;
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use cortex_m_rt::entry;
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#[cfg(not(test))]
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#[entry]
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fn main() -> ! {
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asm::nop(); // To not have main optimize to abort in release mode, remove when you add code
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loop {
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// your code goes here
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}
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}
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fn add(a: i32, b: i32) -> i32 {
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a + b
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn foo() {
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println!("tests work!");
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assert!(2 == add(1,1));
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}
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}
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