unit test

test.sh

@@ -0,0 +1,20 @@
+cd test
+gcc ../boot.c
+all=0
+succ=0
+for i in *.c; do
+    all=$((all+1))
+    i=$(basename $i .c)
+    ./a.out < $i.c > $i.s &&
+    riscv64-linux-gnu-gcc-12 -static $i.s -o $i.c.out && 
+    qemu-riscv64 $i.c.out < $i.in > $i.ans
+    echo $? >> $i.ans
+    if cmp $i.out $i.ans; then
+        succ=$((succ+1))
+        echo "Test '$i' passed"
+    else
+        echo "Test '$i' failed"
+    fi
+done
+echo "Passed $succ/$all tests"
+rm *.c.out *.s *.ans a.out