Added tests for removing files

tests/fs-test.rs

@@ -1,9 +1,12 @@
 mod common;
 
-use std::{fs::read_to_string, path::PathBuf};
+use std::{
+	fs::{read_to_string, File},
+	path::PathBuf,
+};
 
 use byte_unit::{Byte, Unit};
-use common::{build_hermit_bin, check_result, remove_file_if_exists};
+use common::{build_hermit_bin, check_result, remove_file_if_exists, run_simple_vm};
 use uhyvelib::{
 	params::{Output, Params},
 	vm::UhyveVm,
@@ -67,3 +70,42 @@ fn uhyvefilemap_test() {
 	check_result(&res);
 	verify_file_equals(&output_path, "Hello, world!");
 }
+
+#[test]
+fn remove_file_test() {
+	env_logger::try_init().ok();
+	let output_path = PathBuf::from("/tmp/file_to_remove.txt");
+	remove_file_if_exists(&output_path);
+	File::create(&output_path).unwrap();
+
+	let bin_path = build_hermit_bin("remove_file");
+
+	let params = Params {
+		cpu_count: 2.try_into().unwrap(),
+		memory_size: Byte::from_u64_with_unit(64, Unit::MiB)
+			.unwrap()
+			.try_into()
+			.unwrap(),
+		file_mapping: vec!["/tmp/file_to_remove.txt:/root/file_to_remove.txt".to_string()],
+		output: Output::Buffer,
+		stats: true,
+		..Default::default()
+	};
+
+	assert!(output_path.exists());
+
+	let vm = UhyveVm::new(bin_path.clone(), params.clone()).unwrap();
+	let res = vm.run(None);
+	check_result(&res);
+	assert!(!output_path.exists());
+}
+
+#[test]
+fn remove_non_present_file_test() {
+	// kernel tries to open a non-present file, so uhyve will reject the hypercall and the kernel
+	// will panic.
+	env_logger::try_init().ok();
+	let bin_path = build_hermit_bin("remove_file");
+	let res = run_simple_vm(bin_path);
+	assert_ne!(res.code, 0);
+}

tests/test-kernels/src/bin/remove_file.rs

@@ -0,0 +1,10 @@
+use std::fs;
+
+#[cfg(target_os = "hermit")]
+use hermit as _;
+
+fn main() {
+	println!("Hello from remove_file!");
+
+	fs::remove_file("/root/file_to_remove.txt").unwrap();
+}