diff --git a/test/basic/comment.c b/test/basic/comment.c
new file mode 100644
index 0000000..ac46d2d
--- /dev/null
+++ b/test/basic/comment.c
@@ -0,0 +1,4 @@
+// hello
+/* world */
+
+int main() {}
\ No newline at end of file
diff --git a/test/basic/comment.out b/test/basic/comment.out
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/test/basic/comment.out
@@ -0,0 +1 @@
+0
diff --git a/test/loop/break.c b/test/loop/break.c
new file mode 100644
index 0000000..bfa4699
--- /dev/null
+++ b/test/loop/break.c
@@ -0,0 +1,39 @@
+int printf(char* format, ...);
+
+int main() {
+    int i;
+
+    // For loop
+    printf("For loop:\n");
+    for (i = 0; i < 5; i++) {
+        if (i == 3) {
+            break; // Exit the loop when i is 3
+        }
+        printf("%d ", i);
+    }
+    printf("\n");
+
+    // While loop
+    printf("While loop:\n");
+    i = 0;
+    while (i < 5) {
+        if (i == 3) {
+            break; // Exit the loop when i is 3
+        }
+        printf("%d ", i);
+        i++;
+    }
+    printf("\n");
+
+    // Do-while loop
+    printf("Do-while loop:\n");
+    i = 0;
+    do {
+        if (i == 3) {
+            break; // Exit the loop when i is 3
+        }
+        printf("%d ", i);
+        i++;
+    } while (i < 5);
+    printf("\n");
+}
diff --git a/test/loop/break.out b/test/loop/break.out
new file mode 100644
index 0000000..e8ad5e7
--- /dev/null
+++ b/test/loop/break.out
@@ -0,0 +1,7 @@
+For loop:
+0 1 2 
+While loop:
+0 1 2 
+Do-while loop:
+0 1 2 
+0
diff --git a/test/loop/continue.c b/test/loop/continue.c
new file mode 100644
index 0000000..214a62d
--- /dev/null
+++ b/test/loop/continue.c
@@ -0,0 +1,41 @@
+int printf(char* format, ...);
+
+int main() {
+    int i;
+
+    // For loop
+    printf("For loop:\n");
+    for (i = 0; i < 5; i++) {
+        if (i == 3) {
+            continue; // Skip the rest of the loop when i is 3
+        }
+        printf("%d ", i);
+    }
+    printf("\n");
+
+    // While loop
+    printf("While loop:\n");
+    i = 0;
+    while (i < 5) {
+        if (i == 3) {
+            i++;
+            continue; // Skip the rest of the loop when i is 3
+        }
+        printf("%d ", i);
+        i++;
+    }
+    printf("\n");
+
+    // Do-while loop
+    printf("Do-while loop:\n");
+    i = 0;
+    do {
+        if (i == 3) {
+            i++;
+            continue; // Skip the rest of the loop when i is 3
+        }
+        printf("%d ", i);
+        i++;
+    } while (i < 5);
+    printf("\n");
+}
\ No newline at end of file
diff --git a/test/loop/continue.out b/test/loop/continue.out
new file mode 100644
index 0000000..a59c441
--- /dev/null
+++ b/test/loop/continue.out
@@ -0,0 +1,7 @@
+For loop:
+0 1 2 4 
+While loop:
+0 1 2 4 
+Do-while loop:
+0 1 2 4 
+0
diff --git a/test/loop/loop.c b/test/loop/loop.c
deleted file mode 100644
index 6ef9347..0000000
--- a/test/loop/loop.c
+++ /dev/null
@@ -1,105 +0,0 @@
-int printf(char* format, ...);
-int scanf(char* format, ...);
-
-/* **dummy** loop test generated by copilot */
-
-void test_continue() {
-    int i;
-
-    // For loop
-    printf("For loop:\n");
-    for (i = 0; i < 5; i++) {
-        if (i == 3) {
-            continue; // Skip the rest of the loop when i is 3
-        }
-        printf("%d ", i);
-    }
-    printf("\n");
-
-    // While loop
-    printf("While loop:\n");
-    i = 0;
-    while (i < 5) {
-        if (i == 3) {
-            i++;
-            continue; // Skip the rest of the loop when i is 3
-        }
-        printf("%d ", i);
-        i++;
-    }
-    printf("\n");
-
-    // Do-while loop
-    printf("Do-while loop:\n");
-    i = 0;
-    do {
-        if (i == 3) {
-            i++;
-            continue; // Skip the rest of the loop when i is 3
-        }
-        printf("%d ", i);
-        i++;
-    } while (i < 5);
-    printf("\n");
-}
-
-void test_break() {
-    int i;
-
-    // For loop
-    printf("For loop:\n");
-    for (i = 0; i < 5; i++) {
-        if (i == 3) {
-            break; // Exit the loop when i is 3
-        }
-        printf("%d ", i);
-    }
-    printf("\n");
-
-    // While loop
-    printf("While loop:\n");
-    i = 0;
-    while (i < 5) {
-        if (i == 3) {
-            break; // Exit the loop when i is 3
-        }
-        printf("%d ", i);
-        i++;
-    }
-    printf("\n");
-
-    // Do-while loop
-    printf("Do-while loop:\n");
-    i = 0;
-    do {
-        if (i == 3) {
-            break; // Exit the loop when i is 3
-        }
-        printf("%d ", i);
-        i++;
-    } while (i < 5);
-    printf("\n");
-}
-
-void test_nested() {
-    int i; 
-    int j;
-
-    // For loop
-    printf("For loop:\n");
-    for (i = 0; i < 5; i++) {
-        for (j = 0; j < 5; j++) {
-            if (i >= 2 && j >= 2 && i + j >= 5) {
-                return; // Exit nested loop via return
-            }
-            printf("(%d, %d) ", i, j);
-        }
-        printf("\n");
-    }
-}
-
-int main() {
-    test_continue();
-    test_break();
-    test_nested();
-}
\ No newline at end of file
diff --git a/test/loop/loop.out b/test/loop/loop.out
deleted file mode 100644
index 1c18926..0000000
--- a/test/loop/loop.out
+++ /dev/null
@@ -1,16 +0,0 @@
-For loop:
-0 1 2 4 
-While loop:
-0 1 2 4 
-Do-while loop:
-0 1 2 4 
-For loop:
-0 1 2 
-While loop:
-0 1 2 
-Do-while loop:
-0 1 2 
-For loop:
-(0, 0) (0, 1) (0, 2) (0, 3) (0, 4) 
-(1, 0) (1, 1) (1, 2) (1, 3) (1, 4) 
-(2, 0) (2, 1) (2, 2) 0
diff --git a/test/loop/nested.c b/test/loop/nested.c
new file mode 100644
index 0000000..6232e27
--- /dev/null
+++ b/test/loop/nested.c
@@ -0,0 +1,20 @@
+int printf(char* format, ...);
+
+void test() {
+    int i; 
+    int j;
+
+    for (i = 0; i < 5; i++) {
+        for (j = 0; j < 5; j++) {
+            if (i >= 2 && j >= 2 && i + j >= 5) {
+                return; // Exit nested loop via return
+            }
+            printf("(%d, %d)%c", i, j, " \n"[j == 4]);
+        }
+    }
+}
+
+int main() {
+    test();
+    printf("\n");
+}
\ No newline at end of file
diff --git a/test/loop/nested.out b/test/loop/nested.out
new file mode 100644
index 0000000..bea6ce1
--- /dev/null
+++ b/test/loop/nested.out
@@ -0,0 +1,4 @@
+(0, 0) (0, 1) (0, 2) (0, 3) (0, 4)
+(1, 0) (1, 1) (1, 2) (1, 3) (1, 4)
+(2, 0) (2, 1) (2, 2) 
+0
diff --git a/test/operator/unary.c b/test/operator/unary.c
new file mode 100644
index 0000000..4d138db
--- /dev/null
+++ b/test/operator/unary.c
@@ -0,0 +1,9 @@
+int printf(char* format, ...);
+
+int main() {
+    int a = 5;
+    printf("+a=%d\n", +a);
+    printf("-a=%d\n", -a);
+    printf("!a=%d\n", !a);
+    printf("~a=%d\n", ~a);
+}
\ No newline at end of file
diff --git a/test/operator/unary.out b/test/operator/unary.out
new file mode 100644
index 0000000..69a46e7
--- /dev/null
+++ b/test/operator/unary.out
@@ -0,0 +1,5 @@
++a=5
+-a=-5
+!a=0
+~a=-6
+0