diff --git a/README.md b/README.md
index 61e6617..56f9a02 100644
--- a/README.md
+++ b/README.md
@@ -197,7 +197,15 @@ $ pip install gcovr
 然后
 
 ```sh
-$ sh cov.sh
+$ sh cov-boot.sh
 ```
 
-就会在 cov 文件夹下生成自举的 coverage 数据
+或
+
+```sh
+$ sh cov-test.sh
+```
+
+
+就会在 cov 文件夹下生成自举或测试的 coverage 数据
+
diff --git a/boot.c b/boot.c
index 0b88404..742cc52 100644
--- a/boot.c
+++ b/boot.c
@@ -246,7 +246,7 @@ int get_escaped_char() {
     } else if (ch == '\"') {
         ch = '\"';
     } else {
-        fprintf(stderr, "unexpected escaped character: %c\n", ch);
+        fprintf(stderr, "unexpected escaped character: '\\%c'\n", ch);
         exit(1);
     }
     return ch;
diff --git a/cov.sh b/cov-boot.sh
similarity index 100%
rename from cov.sh
rename to cov-boot.sh
diff --git a/cov-test.sh b/cov-test.sh
new file mode 100644
index 0000000..1a3e9f3
--- /dev/null
+++ b/cov-test.sh
@@ -0,0 +1,11 @@
+mkdir -p cov && cd cov && 
+rm *
+gcc --coverage -g -O0 ../boot.c
+for i in ../test/*.c; do
+    i=$(basename $i .c)
+    echo "Running coverage for test '$i'"
+    ./a.out < ../test/$i.c > /dev/null
+    gcov a-boot.c
+done
+
+python3 -m gcovr --html-details --html-theme github.green -o report.html -r ..
\ No newline at end of file
diff --git a/demo/misc.c b/demo/misc.c
deleted file mode 100644
index 45876ad..0000000
--- a/demo/misc.c
+++ /dev/null
@@ -1,26 +0,0 @@
-int printf(char* format, ...);
-
-void should_be(int expected, int actual) {
-    if (expected != actual) {
-        printf("Expected %d, but got %d\n", expected, actual);
-    } else {
-        printf("Passed\n");
-    }
-}
-
-int* p = 0;
-int f1() {
-    int a = 1;
-    return *(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(p))))))))))); // p[10]
-}
-
-
-int main() {
-    int a[15];
-    p = a;
-    for (int i = 0; i < 15; a[i] = i, ++i);
-    p -= 5;
-    should_be(5, f1());
-    should_be(5, a - p);
-    should_be(10, 5);
-}
\ No newline at end of file
diff --git a/demo/strcmp.c b/demo/strcmp.c
deleted file mode 100644
index c880e7d..0000000
--- a/demo/strcmp.c
+++ /dev/null
@@ -1,16 +0,0 @@
-int printf(char* format, ...);
-
-int strcmp(char* s1, char* s2) {
-    while (*s1 && *s2 && *s1 == *s2) {
-        s1++;
-        s2++;
-    }
-    return *s1 - *s2;
-}
-
-int main() {
-    char* s1 = "helloworld";
-    char* s2 = "world";
-    printf("%d\n", strcmp(s1, s2));
-    printf("%d\n", strcmp(s1 + 5, s2));
-}
\ No newline at end of file
diff --git a/test.sh b/test.sh
index 36969af..7025834 100644
--- a/test.sh
+++ b/test.sh
@@ -12,9 +12,10 @@ for i in *.c; do
     if cmp $i.out $i.ans; then
         succ=$((succ+1))
         echo "Test '$i' passed"
+        rm $i.ans
     else
         echo "Test '$i' failed"
     fi
 done
 echo "Passed $succ/$all tests"
-rm *.c.out *.s *.ans a.out
+rm *.c.out a.out
diff --git a/test/add.c b/test/add.c
index 08875dc..b8dcd22 100644
--- a/test/add.c
+++ b/test/add.c
@@ -6,5 +6,14 @@ int main() {
     int b;
     scanf("%d", &a);
     scanf("%d", &b);
-    printf("%d\n", a + b);
+    printf("%d+%d=%d\n", a, b, a + b);
+    printf("%d-%d=%d\n", a, b, a - b);
+    printf("%d*%d=%d\n", a, b, a * b);
+    printf("%d/%d=%d\n", a, b, a / b);
+    printf("%d%%%d=%d\n", a, b, a % b);
+    printf("%d&%d=%d\n", a, b, a & b);
+    printf("%d|%d=%d\n", a, b, a | b);
+    printf("%d^%d=%d\n", a, b, a ^ b);
+    printf("%d<<%d=%d\n", a, b, a << b);
+    printf("%d>>%d=%d\n", a, b, a >> b);
 }
\ No newline at end of file
diff --git a/test/add.in b/test/add.in
index e7e7d8e..82070f9 100644
--- a/test/add.in
+++ b/test/add.in
@@ -1 +1 @@
-3 4
\ No newline at end of file
+5 4
\ No newline at end of file
diff --git a/test/add.out b/test/add.out
index a8148db..b013c92 100644
--- a/test/add.out
+++ b/test/add.out
@@ -1,2 +1,11 @@
-7
+5+4=9
+5-4=1
+5*4=20
+5/4=1
+5%4=1
+5&4=4
+5|4=5
+5^4=1
+5<<4=80
+5>>4=0
 0
diff --git a/test/enum.c b/test/enum.c
new file mode 100644
index 0000000..145b98b
--- /dev/null
+++ b/test/enum.c
@@ -0,0 +1,8 @@
+enum {
+    A, B, C = 1, D, E = A, F
+};
+
+int main() {
+    return A + B + C + D + E + F;
+        // 0 + 1 + 1 + 2 + 0 + 1 = 5
+}
\ No newline at end of file
diff --git a/test/enum.in b/test/enum.in
new file mode 100644
index 0000000..e69de29
diff --git a/test/enum.out b/test/enum.out
new file mode 100644
index 0000000..7ed6ff8
--- /dev/null
+++ b/test/enum.out
@@ -0,0 +1 @@
+5
diff --git a/test/escape.c b/test/escape.c
new file mode 100644
index 0000000..8a0d33e
--- /dev/null
+++ b/test/escape.c
@@ -0,0 +1,32 @@
+int getchar();
+int putchar(int ch);
+int printf(char* format, ...); 
+
+int main() {
+    int ch;
+    while ((ch = getchar()) != -1) {
+        if (ch == '\\') {
+            ch = getchar();
+            if (ch == 'n') {
+                ch = '\n';
+            } else if (ch == 't') {
+                ch = '\t';
+            } else if (ch == 'r') {
+                ch = '\r';
+            } else if (ch == '0') {
+                ch = '\0';
+            } else if (ch == '\\') {
+                ch = '\\';
+            } else if (ch == '\'') {
+                ch = '\'';
+            } else if (ch == '\"') {
+                ch = '\"';
+            } else {
+                printf("unexpected escaped character: '\\%c'\n", ch);
+                return 1;
+            }
+        }
+        putchar(ch);
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/test/escape.in b/test/escape.in
new file mode 100644
index 0000000..0ee2bcc
--- /dev/null
+++ b/test/escape.in
@@ -0,0 +1 @@
+hello\n\tworld\u
\ No newline at end of file
diff --git a/test/escape.out b/test/escape.out
new file mode 100644
index 0000000..3230064
--- /dev/null
+++ b/test/escape.out
@@ -0,0 +1,3 @@
+hello
+	worldunexpected escaped character: '\u'
+1
diff --git a/test/hello.c b/test/hello.c
index 65311ff..27cbf15 100644
--- a/test/hello.c
+++ b/test/hello.c
@@ -1,5 +1,7 @@
 int printf(char* format, ...);
 
+int gi = 42;
+
 int main() {
-    printf("hello world %d\n", 42);
+    printf("hello world %d\n", gi);
 }
\ No newline at end of file
diff --git a/test/loop.c b/test/loop.c
new file mode 100644
index 0000000..98c3e21
--- /dev/null
+++ b/test/loop.c
@@ -0,0 +1,87 @@
+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");
+}
+
+int main() {
+    test_continue();
+    test_break();
+}
\ No newline at end of file
diff --git a/test/loop.in b/test/loop.in
new file mode 100644
index 0000000..e69de29
diff --git a/test/loop.out b/test/loop.out
new file mode 100644
index 0000000..460695d
--- /dev/null
+++ b/test/loop.out
@@ -0,0 +1,13 @@
+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 
+0
diff --git a/test/overflow.c b/test/overflow.c
new file mode 100644
index 0000000..8bb07f7
--- /dev/null
+++ b/test/overflow.c
@@ -0,0 +1,5 @@
+int main() {
+    // int placeholder[1024];
+    int a = 1;
+    return (a=(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(0)))))))))))))))))))))), (a = a);
+}
diff --git a/test/overflow.in b/test/overflow.in
new file mode 100644
index 0000000..e69de29
diff --git a/test/overflow.out b/test/overflow.out
new file mode 100644
index 0000000..209e3ef
--- /dev/null
+++ b/test/overflow.out
@@ -0,0 +1 @@
+20