cat <<'EOF' > expected
foobar=100
prefix_test=200
test_suffix=300
var_1=10
var_2=20
var_A=30
number_12=12
EOF

test_diff <<'EOF'
int printf();

#define CONCAT(a, b) a##b
#define PREFIX(name) prefix_##name
#define SUFFIX(name) name##_suffix

int CONCAT(foo, bar) = 100;
int PREFIX(test) = 200;
int SUFFIX(test) = 300;

#define MAKE_VAR(n) var_##n
int MAKE_VAR(1) = 10;
int MAKE_VAR(2) = 20;

#define A 0
int MAKE_VAR(A) = 30;

#define NUMBER(x, y) number_##x##y
int NUMBER(1, 2) = 12;

int main() {
    printf("foobar=%d\n", foobar);
    printf("prefix_test=%d\n", prefix_test);
    printf("test_suffix=%d\n", test_suffix);
    printf("var_1=%d\n", var_1);
    printf("var_2=%d\n", var_2);
    printf("var_A=%d\n", var_A);
    printf("number_12=%d\n", number_12);
    return 0;
}
EOF