Add comprehensive short type tests to driver.sh

- Add overflow behavior tests for char, short, and int types
- Add sizeof tests for short type and struct containing short
- Add union size test with short member
- Ensure test coverage for short type functionality

Author: hhhh1300

tests/driver.sh

@@ -400,6 +400,37 @@ declare -a arithmetic_tests=(
 run_expr_tests arithmetic_tests
 expr 6 "111 % 7"
 
+# Category: Overflow Behavior
+begin_category "Overflow Behavior" "Testing integer overflow handling"
+
+try_output 0 "-2147483647" << EOF
+int main()
+{
+    int a = 2147483647;
+    a += 2;
+    printf("%d\n", a);
+    return 0;
+}
+EOF
+
+try_output 0 "-32767" << EOF
+int main() {
+    short a = 32767;
+    a += 2;
+    printf("%d\n", a);
+    return 0;
+}
+EOF
+
+try_output 0 "-127" << EOF
+int main() {
+    char a = 127;
+    a += 2;
+    printf("%d\n", a);
+    return 0;
+}
+EOF
+
 # Category: Comparison Operations
 begin_category "Comparison Operations" "Testing relational and equality operators"
 
@@ -2097,6 +2128,16 @@ typedef struct {
 } struct_t;
 int main() { return sizeof(struct_t*); }
 EOF
+
+try_ 6 << EOF
+typedef struct {
+    int x;
+    short y;
+} struct_t;
+
+int main() { return sizeof(struct_t); }
+EOF
+
 # sizeof enum
 try_ 4 << EOF
 typedef enum {
@@ -2111,6 +2152,7 @@ items 4 "int x = 42; return sizeof(x);"
 items 4 "int arr[5]; return sizeof(arr[0]);"
 items 4 "int x = 10; int *ptr = &x; return sizeof(*ptr);"
 items 1 "char c = 'A'; return sizeof(c);"
+items 2 "short s = 100; return sizeof(s);"
 items 4 "int a = 1, b = 2; return sizeof(a + b);"
 
 # sizeof with complex expressions
@@ -4761,6 +4803,17 @@ int main() {
 }
 EOF
 
+try_ 2 << EOF
+typedef union {
+    short s;    /* 2 bytes */
+    char c;     /* 1 byte */
+} size_union_t;
+
+int main() {
+    return sizeof(size_union_t);  /* Returns 2 (size of short) */
+}
+EOF
+
 # Union with different data types
 try_output 0 "Value as int: 1094795585, as char: 65" << EOF
 typedef union {