unignore test

tests/.gitignore

@@ -2,3 +2,4 @@
 
 !.gitignore
 !*.s
+!*.rs

tests/instructions.rs

@@ -0,0 +1,38 @@
+use std::{fs::File, io::Read};
+
+use rstest::rstest;
+use rysk::cpu::Cpu;
+
+#[rstest]
+#[case::addi("tests/addi.bin", &[(31, 6)], &[], &[])]
+#[case::csr("tests/csr.bin", &[(5, 1), (6, 2), (7, 3)], &[], &[(256, 4), (261, 5), (321, 6), (768, 1), (773, 2), (833, 3)])]
+fn run_test(
+    #[case] path: &str,
+    #[case] expected_regs: &[(usize, u64)],
+    #[case] expected_mem: &[(usize, u8)],
+    #[case] expected_csr: &[(usize, u64)],
+) {
+    let mut file = File::open(path).expect("did you run 'make test' ?");
+    let mut code = Vec::new();
+    file.read_to_end(&mut code).unwrap();
+
+    let mut cpu = Cpu::new(code);
+    cpu.run().unwrap();
+
+    cpu.dump_registers();
+    cpu.dump_csr();
+
+    assert_eq!(cpu.regs[0], 0, "zero register is not 0");
+
+    for (reg, value) in expected_regs {
+        assert_eq!(cpu.regs[*reg], *value, "register mismatch");
+    }
+
+    for (addr, value) in expected_mem {
+        assert_eq!(cpu.bus.dram.dram[*addr], *value, "memory mismatch");
+    }
+
+    for (addr, value) in expected_csr {
+        assert_eq!(cpu.csrs[*addr], *value, "csrs mismatch");
+    }
+}