2 files changed, 118 insertions, 0 deletions
diff --git a/tests/vnf-tests/Cargo.toml b/tests/vnf-tests/Cargo.toml
new file mode 100644
index 0000000..8ad6b70
--- /dev/null
+++ b/tests/vnf-tests/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "vnf-tests"
+version = "0.1.0"
+edition = "2024"
+license.workspace = true
+authors.workspace = true
+
+[dependencies]
+vnf.workspace = true
+xixanta.workspace = true
diff --git a/tests/vnf-tests/src/main.rs b/tests/vnf-tests/src/main.rs
new file mode 100644
index 0000000..6c62dbd
--- /dev/null
+++ b/tests/vnf-tests/src/main.rs
@@ -0,0 +1,108 @@
+use std::path::PathBuf;
+
+use vnf::{Machine, MemoryPolicy};
+use xixanta::opcodes::InstructionIdentifier;
+
+#[derive(Default)]
+struct Args {
+    file: String,
+}
+
+fn print_help() {
+    println!("End-to-end tests for the vnf library\n");
+    println!("usage: vnf-tests [OPTIONS] <tests/ directory>\n");
+    println!("Options:");
+    println!("  -h, --help\t\t\tPrint this message and quit.");
+    std::process::exit(0);
+}
+
+// Print the given `message` and exit(1).
+fn die(message: String) -> ! {
+    eprintln!("error: {message}");
+    std::process::exit(1);
+}
+
+fn parse_arguments() -> Args {
+    let mut args = std::env::args();
+    let mut res = Args::default();
+
+    // Skip command name.
+    args.next();
+
+    for arg in args {
+        match arg.as_str() {
+            "-h" | "--help" => print_help(),
+            _ => {
+                if arg.starts_with('-') {
+                    die(format!("don't know how to handle the '{arg}' flag"));
+                }
+                if !res.file.is_empty() {
+                    die("cannot have multiple paths".to_string());
+                }
+                res.file = arg;
+            }
+        }
+    }
+
+    if res.file.is_empty() {
+        die("you have to provide a path to the tests/ directory".to_string());
+    }
+
+    res
+}
+
+fn run_break_mark_test(path: &String) -> Result<(), String> {
+    let rom = PathBuf::from(path).join("out/stack.nes");
+    let roms: String = rom.to_string_lossy().into_owned().to_string();
+
+    let mut machine = Machine::from(&roms, 0x8000, MemoryPolicy::default())?;
+
+    // Get out of <start>
+    let _ = machine.next_iteration();
+
+    // Assert that we are at the expected location.
+    assert!(matches!(
+        machine.current_instruction.identifier,
+        InstructionIdentifier::Brk
+    ));
+
+    // Before vs after running 'brk'.
+    assert_eq!(machine.status_register.break_mark, 0);
+    assert!(!machine.status_register.brk);
+    let _ = machine.next_iteration();
+    assert_eq!(machine.status_register.break_mark, 0x42);
+    assert!(machine.status_register.brk);
+
+    // Skip instructions we don't care about here.
+    for _ in 0..11 {
+        let _ = machine.next_iteration();
+    }
+
+    // Before running 'plp', everything is still as expected.
+    assert!(matches!(
+        machine.current_instruction.identifier,
+        InstructionIdentifier::Plp
+    ));
+    assert_eq!(machine.status_register.break_mark, 0x42);
+    assert!(machine.status_register.brk);
+
+    // After running 'plp'.
+    let _ = machine.next_iteration();
+    assert_eq!(machine.status_register.break_mark, 0x00);
+    assert!(!machine.status_register.brk);
+
+    Ok(())
+}
+
+fn main() {
+    let args = parse_arguments();
+    let file = PathBuf::from(args.file.clone());
+
+    if !file.is_dir() {
+        die("you have to provide a path to the tests/ directory".to_string());
+    }
+
+    if let Err(e) = run_break_mark_test(&args.file) {
+        die(e)
+    }
+}