add tests for the unikernel

examples/Cargo.toml

+[package]
+name = "hctests"
+version = "0.1.0"
+authors = ["Stefan Lankes <slankes@eonerc.rwth-aachen.de>"]
+edition = "2018"
+
+[dependencies]
+
+[workspace]

examples/Makefile

+RM = rm -rf
+#TARGET =
+TARGET = --target x86_64-unknown-hermit
+#TARGET = --target x86_64-unknown-linux-gnu
+ 
+all:
+	cargo build --tests $(TARGET)
+
+clean:
+	$(RM) target

examples/src/main.rs

+#![feature(test)]
+
+extern crate test;
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use std::thread;
+	use test::Bencher;
+
+	fn pi(nthreads: u64, num_steps: u64)
+	{
+		let step = 1.0 / num_steps as f64;
+		let mut sum = 0.0 as f64;
+
+		let threads: Vec<_> = (0..nthreads)
+   	     .map(|tid| {
+				thread::spawn(move || {
+					let mut partial_sum = 0 as f64;
+					let start = (num_steps / nthreads) * tid;
+					let end = (num_steps / nthreads) * (tid+1);
+
+					for i  in start..end {
+				        let x = (i as f64 + 0.5) * step;
+						partial_sum += 4.0 / (1.0 + x * x);
+				    }
+
+					partial_sum
+				})
+			}).collect();
+
+		for t in threads {
+			sum += t.join().unwrap();
+		}
+
+		println!("Pi: {}", sum * (1.0 / num_steps as f64));
+	}
+
+
+	#[bench]
+	fn bench_pi(b: &mut Bencher) {
+    	b.iter(|| pi(2, 10000000));
+	}
+
+	#[test]
+	fn hello() {
+    	println!("Hello, world!");
+	}
+}
+
+fn main() {
+	println!("Please use `cargo test --no-run' to build the tests");
+}