test(app): add live-tests flag for testing app as a whole

.github/workflows/ci.yml

@@ -98,7 +98,7 @@ jobs:
           mv cargo-tarpaulin ~/.cargo/bin/
 
       - name: Run tests
-        run: NO_COLOR=1 cargo tarpaulin --out Xml --verbose
+        run: NO_COLOR=1 sudo -E cargo tarpaulin --features live-tests --out Xml --verbose
 
       - name: Upload reports to codecov
         uses: codecov/codecov-action@v1

systeroid/Cargo.toml

@@ -4,6 +4,10 @@ version = "0.1.0"
 authors = ["Orhun Parmaksız <orhunparmaksiz@gmail.com>"]
 edition = "2021"
 
+[features]
+# tests that affect the system state
+live-tests = []
+
 [dependencies]
 getopts = "0.2.21"
 

systeroid/src/lib.rs

@@ -9,13 +9,13 @@ pub mod args;
 
 use crate::app::App;
 use crate::args::Args;
-use std::io;
+use std::io::Write;
 use systeroid_core::config::Config;
 use systeroid_core::error::Result;
 use systeroid_core::sysctl::controller::Sysctl;
 
 /// Runs `systeroid`.
-pub fn run(args: Args) -> Result<()> {
+pub fn run<Output: Write>(args: Args, output: &mut Output) -> Result<()> {
     let config = Config {
         verbose: args.verbose,
         ignore_errors: args.ignore_errors,
@@ -24,9 +24,8 @@ pub fn run(args: Args) -> Result<()> {
         display_type: args.display_type,
         ..Default::default()
     };
-    let mut stdout = io::stdout();
     let mut sysctl = Sysctl::init(config)?;
-    let mut app = App::new(&mut sysctl, &mut stdout, args.tree_output)?;
+    let mut app = App::new(&mut sysctl, output, args.tree_output)?;
 
     if args.preload_system_files {
         app.preload_from_system()?;

systeroid/src/main.rs

@@ -1,10 +1,12 @@
 use std::env;
+use std::io;
 use std::process;
 use systeroid::args::Args;
 
 fn main() {
     if let Some(args) = Args::parse(env::args().collect()) {
-        match systeroid::run(args) {
+        let mut stdout = io::stdout();
+        match systeroid::run(args, &mut stdout) {
             Ok(_) => process::exit(0),
             Err(e) => {
                 eprintln!("{}", e);

systeroid/tests/live_test.rs

@@ -0,0 +1,30 @@
+use {
+    systeroid::args::Args, systeroid_core::error::Result,
+    systeroid_core::sysctl::display::DisplayType,
+};
+
+#[cfg_attr(not(feature = "live-tests"), ignore)]
+#[test]
+fn test_systeroid() -> Result<()> {
+    let args = Args::default();
+    let mut output = Vec::new();
+    systeroid::run(args, &mut output)?;
+    assert!(String::from_utf8_lossy(&output).contains("kernel.watchdog ="));
+
+    let args = Args {
+        values: vec![String::from("vm.zone_reclaim_mode=0")],
+        display_type: DisplayType::Binary,
+        ..Args::default()
+    };
+    let mut output = Vec::new();
+    systeroid::run(args, &mut output)?;
+    assert_eq!("0", String::from_utf8_lossy(&output));
+
+    let args = Args {
+        preload_system_files: true,
+        ..Args::default()
+    };
+    systeroid::run(args, &mut Vec::new())?;
+
+    Ok(())
+}