test.sh

#!/bin/bash
assert() {
  expected="$1"
  input="$2"

  ./9cc "$input" > tmp.s
  cc -Wl,-z,noexecstack -o tmp tmp.s
  ./tmp
  actual="$?"

  if [ "$actual" = "$expected" ]; then
    echo "'$input' => $actual"
  else
    echo "'$input' => $expected expected, but got $actual"
    exit 1
  fi
}

assert 0 "0;"
assert 42 "42;"
assert 21 "5+20-4;"
assert 41 " 12 + 34 - 5 ;"
assert 47 "5+6*7;"
assert 15 "5*(9-6);"
assert 4 "(3+5)/2;"
assert 10 "-10+20;"

assert 0 "0==1;"
assert 1 "42==42;"
assert 1 "0!=1;"
assert 0 "42!=42;"

assert 1 "0<1;"
assert 0 "1<1;"
assert 0 "2<1;"
assert 1 "0<=1;"
assert 1 "1<=1;"
assert 0 "2<=1;"

assert 1 "1>0;"
assert 0 "1>1;"
assert 0 "1>2;"
assert 1 "1>=0;"
assert 1 "1>=1;"
assert 0 "1>=2;"

assert 11 "a = 11; b = 32; a;"
assert 32 "a = 11; b = 32; b;"
assert 43 "a = 11; b = 32; a+b;"
assert 3 "a = 11; b = a = 3; a;"

assert 5 "abc = 2; foo_2 = 4; abc + 3;"
assert 10 "abc = 2; foo_2 = 4; foo_2 + 6;"

echo OK