refactor: test helpers

106 files changed, 216 insertions, 383 deletions

diff --git a/tests/001.sh b/tests/001.sh
index 00e0aca..9337ec5 100644
--- a/tests/001.sh
+++ b/tests/001.sh
@@ -1,4 +1,4 @@
-bash ../../test_exit_code.sh 42 <<'EOF'
+test_exit_code 42 <<'EOF'
 int main() {
     return 42;
 }
diff --git a/tests/002.sh b/tests/002.sh
index ee54213..c3fdcc9 100644
--- a/tests/002.sh
+++ b/tests/002.sh
@@ -1,4 +1,4 @@
-bash ../../test_exit_code.sh 21 <<'EOF'
+test_exit_code 21 <<'EOF'
 int main() {
     return 5+20-4;
 }
diff --git a/tests/003.sh b/tests/003.sh
index 4fa0b42..61ea83f 100644
--- a/tests/003.sh
+++ b/tests/003.sh
@@ -1,4 +1,4 @@
-bash ../../test_exit_code.sh 26 <<'EOF'
+test_exit_code 26 <<'EOF'
 int main() {
     return 2*3+4*5;
 }
diff --git a/tests/004.sh b/tests/004.sh
index b5ceb16..028ef90 100644
--- a/tests/004.sh
+++ b/tests/004.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 197 <<'EOF'
+test_exit_code 197 <<'EOF'
 int main() {
     return (((3+5)/2) + (5*(9-6)) * (5+6*7)) % 256;
 }
diff --git a/tests/005.sh b/tests/005.sh
index 1b4611a..ffcd0a5 100644
--- a/tests/005.sh
+++ b/tests/005.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 30 <<'EOF'
+test_exit_code 30 <<'EOF'
 int main() {
     return (-10 + 20 * -3) + 100;
 }
diff --git a/tests/006.sh b/tests/006.sh
index 2ae85ec..ee88013 100644
--- a/tests/006.sh
+++ b/tests/006.sh
@@ -1,48 +1,46 @@
-set -e
-
-bash ../../test_exit_code.sh 1 <<'EOF'
+test_exit_code 1 <<'EOF'
 int main() {
     return 0 == 0;
 }
 EOF
 
-bash ../../test_exit_code.sh 0 <<'EOF'
+test_exit_code 0 <<'EOF'
 int main() {
     return 123 != 123;
 }
 EOF
 
-bash ../../test_exit_code.sh 1 <<'EOF'
+test_exit_code 1 <<'EOF'
 int main() {
     return 123 != 456;
 }
 EOF
 
-bash ../../test_exit_code.sh 0 <<'EOF'
+test_exit_code 0 <<'EOF'
 int main() {
     return 123 == 124;
 }
 EOF
 
-bash ../../test_exit_code.sh 1 <<'EOF'
+test_exit_code 1 <<'EOF'
 int main() {
     return 123 < 567;
 }
 EOF
 
-bash ../../test_exit_code.sh 1 <<'EOF'
+test_exit_code 1 <<'EOF'
 int main() {
     return 123 <= 567;
 }
 EOF
 
-bash ../../test_exit_code.sh 1 <<'EOF'
+test_exit_code 1 <<'EOF'
 int main() {
     return 123 <= 123;
 }
 EOF
 
-bash ../../test_exit_code.sh 0 <<'EOF'
+test_exit_code 0 <<'EOF'
 int main() {
     return 123 < 123;
 }
diff --git a/tests/007.sh b/tests/007.sh
index 6f043b7..d780993 100644
--- a/tests/007.sh
+++ b/tests/007.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 42 <<'EOF'
+test_exit_code 42 <<'EOF'
 int main() {
     int foo;
     foo = 42;
diff --git a/tests/008.sh b/tests/008.sh
index 94936cd..6de3a99 100644
--- a/tests/008.sh
+++ b/tests/008.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 70 <<'EOF'
+test_exit_code 70 <<'EOF'
 int main() {
     int foo;
     int bar;
diff --git a/tests/009.sh b/tests/009.sh
index 5ebcd0a..821d330 100644
--- a/tests/009.sh
+++ b/tests/009.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 45 <<'EOF'
+test_exit_code 45 <<'EOF'
 int main() {
     int a1;
     int a2;
diff --git a/tests/010.sh b/tests/010.sh
index df6601c..4ddf39c 100644
--- a/tests/010.sh
+++ b/tests/010.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 12 <<'EOF'
+test_exit_code 12 <<'EOF'
 int main() {
     if (1) {
         return 12;
@@ -10,7 +8,7 @@ int main() {
 }
 EOF
 
-bash ../../test_exit_code.sh 34 <<'EOF'
+test_exit_code 34 <<'EOF'
 int main() {
     if (1 + 1 != 2) {
         return 12;
diff --git a/tests/011.sh b/tests/011.sh
index f9ee216..877b8d1 100644
--- a/tests/011.sh
+++ b/tests/011.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 45 <<'EOF'
+test_exit_code 45 <<'EOF'
 int main() {
     int i;
     int ret;
diff --git a/tests/012.sh b/tests/012.sh
index 279e3c2..bee4e69 100644
--- a/tests/012.sh
+++ b/tests/012.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 25 <<'EOF'
+test_exit_code 25 <<'EOF'
 int main() {
     int i;
     int ret;
diff --git a/tests/013.sh b/tests/013.sh
index 8381d0e..e8e4b13 100644
--- a/tests/013.sh
+++ b/tests/013.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 66 <<'EOF'
+test_exit_code 66 <<'EOF'
 int main() {
     int i;
     int ret;
diff --git a/tests/014.sh b/tests/014.sh
index ba32d1f..7e5573a 100644
--- a/tests/014.sh
+++ b/tests/014.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 66 <<'EOF'
+test_exit_code 66 <<'EOF'
 int foo() {
     int i;
     int ret;
diff --git a/tests/015.sh b/tests/015.sh
index 6b084e8..e1964b8 100644
--- a/tests/015.sh
+++ b/tests/015.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 10 <<'EOF'
+test_exit_code 10 <<'EOF'
 int f(int a, int b, int c, int d, int e, int f) {
     return a;
 }
@@ -10,7 +8,7 @@ int main() {
 }
 EOF
 
-bash ../../test_exit_code.sh 20 <<'EOF'
+test_exit_code 20 <<'EOF'
 int f(int a, int b, int c, int d, int e, int f) {
     return b;
 }
@@ -20,7 +18,7 @@ int main() {
 }
 EOF
 
-bash ../../test_exit_code.sh 30 <<'EOF'
+test_exit_code 30 <<'EOF'
 int f(int a, int b, int c, int d, int e, int f) {
     return c;
 }
@@ -30,7 +28,7 @@ int main() {
 }
 EOF
 
-bash ../../test_exit_code.sh 40 <<'EOF'
+test_exit_code 40 <<'EOF'
 int f(int a, int b, int c, int d, int e, int f) {
     return d;
 }
@@ -40,7 +38,7 @@ int main() {
 }
 EOF
 
-bash ../../test_exit_code.sh 50 <<'EOF'
+test_exit_code 50 <<'EOF'
 int f(int a, int b, int c, int d, int e, int f) {
     return e;
 }
@@ -50,7 +48,7 @@ int main() {
 }
 EOF
 
-bash ../../test_exit_code.sh 60 <<'EOF'
+test_exit_code 60 <<'EOF'
 int f(int a, int b, int c, int d, int e, int f) {
     return f;
 }
diff --git a/tests/016.sh b/tests/016.sh
index 02d3357..82c433d 100644
--- a/tests/016.sh
+++ b/tests/016.sh
@@ -1,6 +1,4 @@
-set -e
-
-bash ../../test_exit_code.sh 89 <<'EOF'
+test_exit_code 89 <<'EOF'
 int fib(int n) {
     if (n <= 1) {
         return 1;
diff --git a/tests/017.sh b/tests/017.sh
index dd6edeb..552fbf4 100644
--- a/tests/017.sh
+++ b/tests/017.sh
@@ -1,7 +1,5 @@
-set -e
-
 touch expected
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int main() {
     return 0;
 }
diff --git a/tests/018.sh b/tests/018.sh
index cc02105..a9d4e1d 100644
--- a/tests/018.sh
+++ b/tests/018.sh
@@ -1,7 +1,5 @@
-set -e
-
 touch expected
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int main() {
     "";
     return 0;
@@ -9,7 +7,7 @@ int main() {
 EOF
 
 touch expected
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int main() {
     "abc";
     return 0;
@@ -17,7 +15,7 @@ int main() {
 EOF
 
 touch expected
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int main() {
     "\"foo\"bar\\\n\"";
     return 0;
diff --git a/tests/019.sh b/tests/019.sh
index b776285..33b2e7d 100644
--- a/tests/019.sh
+++ b/tests/019.sh
@@ -1,7 +1,5 @@
-set -e
-
 touch expected
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
@@ -13,7 +11,7 @@ EOF
 cat <<'EOF' > expected
 Hello, World!
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
@@ -25,7 +23,7 @@ EOF
 cat <<'EOF' > expected
 "Hello, World!"
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/020.sh b/tests/020.sh
index 146f725..abc3f8e 100644
--- a/tests/020.sh
+++ b/tests/020.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 1
 2
@@ -102,7 +100,7 @@ Fizz
 Fizz
 Buzz
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/021.sh b/tests/021.sh
index 2f225e1..d51057f 100644
--- a/tests/021.sh
+++ b/tests/021.sh
@@ -1,8 +1,6 @@
-set -e
-
 cat <<'EOF' > expected
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int main() {
     int a1;
     int* a2;
diff --git a/tests/022.sh b/tests/022.sh
index e5749f2..93efe9b 100644
--- a/tests/022.sh
+++ b/tests/022.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 42 42
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/023.sh b/tests/023.sh
index cb77c22..8346e3a 100644
--- a/tests/023.sh
+++ b/tests/023.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 sizeof(int) = 4
 sizeof(int*) = 8
@@ -17,7 +15,7 @@ sizeof(char***) = 8
 sizeof(long***) = 8
 sizeof(void***) = 8
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/024.sh b/tests/024.sh
index 20453a0..9b3c484 100644
--- a/tests/024.sh
+++ b/tests/024.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 3
 3
 3
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/025.sh b/tests/025.sh
index 1f673a1..54fd905 100644
--- a/tests/025.sh
+++ b/tests/025.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 123
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 void foo_bar(int hoge_piyo) {
diff --git a/tests/026.sh b/tests/026.sh
index cd4500e..093adf0 100644
--- a/tests/026.sh
+++ b/tests/026.sh
@@ -1,8 +1,6 @@
-set -e
-
 cat <<'EOF' > expected
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #define A 1
 int main() {
     return 0;
@@ -12,7 +10,7 @@ EOF
 cat <<'EOF' > expected
 1,2,3
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 #define A 1
@@ -28,7 +26,7 @@ EOF
 cat <<'EOF' > expected
 0,0,0,0
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 #define NULL 0
diff --git a/tests/027.sh b/tests/027.sh
index ee10aa3..167d398 100644
--- a/tests/027.sh
+++ b/tests/027.sh
@@ -1,8 +1,6 @@
-set -e
-
 cat <<'EOF' > expected
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 struct Token {
     int kind;
     char* value;
diff --git a/tests/028.sh b/tests/028.sh
index f5f7a6d..a3babed 100644
--- a/tests/028.sh
+++ b/tests/028.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 sizeof(struct Token) = 16
 sizeof(struct Define) = 16
@@ -10,7 +8,7 @@ sizeof(struct Func) = 16
 sizeof(struct Parser) = 64
 sizeof(struct CodeGen) = 16
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 struct Token {
     int kind;
     char* value;
diff --git a/tests/029.sh b/tests/029.sh
index 7904c17..81cc5b4 100644
--- a/tests/029.sh
+++ b/tests/029.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 42
 123
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 struct S {
     int a;
     int b;
diff --git a/tests/030.sh b/tests/030.sh
index e444938..fda5dc8 100644
--- a/tests/030.sh
+++ b/tests/030.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 foo
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int foo() {
@@ -30,7 +28,7 @@ foo
 bar
 baz
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int foo() {
diff --git a/tests/031.sh b/tests/031.sh
index 7747f84..a2b3832 100644
--- a/tests/031.sh
+++ b/tests/031.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 42
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/032.sh b/tests/032.sh
index 5e55b2a..b5812dd 100644
--- a/tests/032.sh
+++ b/tests/032.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 97 48
 92 39
 10
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/033.sh b/tests/033.sh
index 1fb92ac..fd43548 100644
--- a/tests/033.sh
+++ b/tests/033.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 42
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 void* calloc();
 
@@ -28,7 +26,7 @@ cat <<'EOF' > expected
 8 8
 9 9
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 void* calloc();
 
diff --git a/tests/034.sh b/tests/034.sh
index 12391f4..ebf0a4e 100644
--- a/tests/034.sh
+++ b/tests/034.sh
@@ -1,8 +1,6 @@
-set -e
-
 cat <<'EOF' > expected
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 struct S {
     int a;
 };
diff --git a/tests/035.sh b/tests/035.sh
index a32709e..f411a27 100644
--- a/tests/035.sh
+++ b/tests/035.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 0
 1
 0
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/036.sh b/tests/036.sh
index 2a60cf9..0975bcf 100644
--- a/tests/036.sh
+++ b/tests/036.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 42
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 void* calloc();
 int printf();
 
diff --git a/tests/037.sh b/tests/037.sh
index bc6867b..bef69a5 100644
--- a/tests/037.sh
+++ b/tests/037.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 hi
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 void f() {
diff --git a/tests/038.sh b/tests/038.sh
index 66ab0ed..465108e 100644
--- a/tests/038.sh
+++ b/tests/038.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > input
 abc
 EOF
@@ -7,7 +5,7 @@ cat <<'EOF' > expected
 4
 abc
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 void* calloc();
 int getchar();
 int printf();
diff --git a/tests/039.sh b/tests/039.sh
index fb9dbdb..f00d024 100644
--- a/tests/039.sh
+++ b/tests/039.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 65
 65
@@ -7,7 +5,7 @@ cat <<'EOF' > expected
 67
 68
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 void* calloc();
 int printf();
 
diff --git a/tests/040.sh b/tests/040.sh
index 647a0e7..88ba93f 100644
--- a/tests/040.sh
+++ b/tests/040.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 0
 1
@@ -18,7 +16,7 @@ cat <<'EOF' > expected
 24
 25
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/041.sh b/tests/041.sh
index d409158..a867cac 100644
--- a/tests/041.sh
+++ b/tests/041.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 0
 1
@@ -20,7 +18,7 @@ cat <<'EOF' > expected
 
 3
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/042.sh b/tests/042.sh
index b9f1749..8e2c85b 100644
--- a/tests/042.sh
+++ b/tests/042.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 42,123
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 #define A foo_a
diff --git a/tests/043.sh b/tests/043.sh
index a343918..ae00bd3 100644
--- a/tests/043.sh
+++ b/tests/043.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 42,123
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/044.sh b/tests/044.sh
index c6f0b06..a460ae4 100644
--- a/tests/044.sh
+++ b/tests/044.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 4
 0,1,2
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 enum E {
diff --git a/tests/045.sh b/tests/045.sh
index f788b62..efd6a30 100644
--- a/tests/045.sh
+++ b/tests/045.sh
@@ -1,8 +1,6 @@
-set -e
-
 cat <<'EOF' > expected
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 typedef long size_t;
 
 int atoi(const char*);
diff --git a/tests/046.sh b/tests/046.sh
index 3011ff3..240d969 100644
--- a/tests/046.sh
+++ b/tests/046.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 42
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 void* calloc();
 int printf();
 
diff --git a/tests/047.sh b/tests/047.sh
index f50ee69..57d0d8f 100644
--- a/tests/047.sh
+++ b/tests/047.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 body 0
 foo 1
@@ -12,7 +10,7 @@ foo 4
 body 4
 foo 5
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int foo(int i) {
@@ -38,7 +36,7 @@ body 1
 foo 2
 body 2
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int foo(int i) {
@@ -70,7 +68,7 @@ foo 4
 body 5
 foo 5
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int foo(int i) {
diff --git a/tests/048.sh b/tests/048.sh
index 76b500f..7286815 100644
--- a/tests/048.sh
+++ b/tests/048.sh
@@ -1,12 +1,10 @@
-set -e
-
 cat <<'EOF' > expected
 argc = 4
 argv[1] = hoge
 argv[2] = piyo
 argv[3] = fuga
 EOF
-bash ../../test_diff.sh hoge piyo fuga<<'EOF'
+test_diff hoge piyo fuga<<'EOF'
 int printf();
 
 int main(int argc, char** argv) {
diff --git a/tests/049.sh b/tests/049.sh
index 114bdb9..4484324 100644
--- a/tests/049.sh
+++ b/tests/049.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > input
 foo
 bar
@@ -13,7 +11,7 @@ bar
 baz
 baz
 EOF
-bash ../../test_diff.sh hoge piyo fuga<<'EOF'
+test_diff hoge piyo fuga<<'EOF'
 struct FILE;
 typedef struct FILE FILE;
 extern FILE* stdin;
diff --git a/tests/050.sh b/tests/050.sh
index 96f28fe..1d3fe2d 100644
--- a/tests/050.sh
+++ b/tests/050.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 hello, world
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 int main() {
     printf("hello, world\n");
diff --git a/tests/051.sh b/tests/051.sh
index 74a7327..f504664 100644
--- a/tests/051.sh
+++ b/tests/051.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 undefined function: f
 EOF
-bash ../../test_compile_error.sh <<'EOF'
+test_compile_error <<'EOF'
 int main() {
     f();
 }
diff --git a/tests/052.sh b/tests/052.sh
index df479d3..73bcd5d 100644
--- a/tests/052.sh
+++ b/tests/052.sh
@@ -1,8 +1,6 @@
-set -e
-
 cat <<'EOF' > expected
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 // TODO: check if the token is at the beginning of line.
 // TODO: check if skipped whitespaces do not contain line breaks.
 int main() {
diff --git a/tests/053.sh b/tests/053.sh
index c4350b8..f97a17d 100644
--- a/tests/053.sh
+++ b/tests/053.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 39
 34
@@ -13,7 +11,7 @@ cat <<'EOF' > expected
 9
 11
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/054.sh b/tests/054.sh
index 06252b9..4990b89 100644
--- a/tests/054.sh
+++ b/tests/054.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 0
 1
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 void* calloc();
 
diff --git a/tests/055.sh b/tests/055.sh
index d5e65f3..6fc3608 100644
--- a/tests/055.sh
+++ b/tests/055.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 8
 EOF
@@ -12,7 +10,7 @@ int add(int a, int b) {
 int printf(const char*, ...);
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #include "header.h"
 
 int main() {
diff --git a/tests/056.sh b/tests/056.sh
index 7bad4c0..ff2ad18 100644
--- a/tests/056.sh
+++ b/tests/056.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 12
 EOF
@@ -20,7 +18,7 @@ int calculate(int x) {
 int printf(const char*, ...);
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #include "calc.h"
 
 int main() {
diff --git a/tests/057.sh b/tests/057.sh
index 6d1265f..8850e55 100644
--- a/tests/057.sh
+++ b/tests/057.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 cannot open include file: nonexistent.h
 EOF
 
-bash ../../test_compile_error.sh <<'EOF'
+test_compile_error <<'EOF'
 #include "nonexistent.h"
 
 int main() {
diff --git a/tests/058.sh b/tests/058.sh
index 3be7ad1..b491ad4 100644
--- a/tests/058.sh
+++ b/tests/058.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 include depth limit exceeded
 EOF
@@ -15,7 +13,7 @@ cat <<'EOF' > b.h
 int b() { return 2; }
 EOF
 
-bash ../../test_compile_error.sh <<'EOF'
+test_compile_error <<'EOF'
 #include "a.h"
 
 int main() {
diff --git a/tests/059.sh b/tests/059.sh
index 80a6e10..189ff5e 100644
--- a/tests/059.sh
+++ b/tests/059.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 main.c:1: expected '{', but got '}'
 EOF
 
-bash ../../test_compile_error.sh <<'EOF'
+test_compile_error <<'EOF'
 int main() }
 EOF
 
@@ -12,6 +10,6 @@ cat <<'EOF' > expected
 main.c:1: expected '{', but got '123 (<integer>)'
 EOF
 
-bash ../../test_compile_error.sh <<'EOF'
+test_compile_error <<'EOF'
 int main() 123
 EOF
diff --git a/tests/060.sh b/tests/060.sh
index 03d65b7..7f80fcf 100644
--- a/tests/060.sh
+++ b/tests/060.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 42
 EOF
@@ -8,7 +6,7 @@ cat <<'EOF' > header.h
 #define A 42
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #include "header.h"
 
 int printf();
diff --git a/tests/061.sh b/tests/061.sh
index 17c5f6a..019aac2 100644
--- a/tests/061.sh
+++ b/tests/061.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 1
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/062.sh b/tests/062.sh
index d50ecc6..74ef2e1 100644
--- a/tests/062.sh
+++ b/tests/062.sh
@@ -1,12 +1,10 @@
-set -e
-
 cat <<'EOF' > expected
 __ducc__ is defined.
 A is defined.
 B is undefined.
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 #define A 123
diff --git a/tests/063.sh b/tests/063.sh
index a3095e8..4f899ee 100644
--- a/tests/063.sh
+++ b/tests/063.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 123
 456 789
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #include <stdarg.h>
 
 int fprintf();
diff --git a/tests/064.sh b/tests/064.sh
index c3b6028..20a8bed 100644
--- a/tests/064.sh
+++ b/tests/064.sh
@@ -1,18 +1,16 @@
-set -e
-
 # C99: 5.1.2.2.3
-bash ../../test_exit_code.sh 0 <<'EOF'
+test_exit_code 0 <<'EOF'
 int main() {
 }
 EOF
 
-bash ../../test_exit_code.sh 0 <<'EOF'
+test_exit_code 0 <<'EOF'
 int main() {
     1 + 2 + 3;
 }
 EOF
 
-bash ../../test_exit_code.sh 0 <<'EOF'
+test_exit_code 0 <<'EOF'
 int main() {
     if (1);
     else return 1;
diff --git a/tests/065.sh b/tests/065.sh
index b644bed..8588944 100644
--- a/tests/065.sh
+++ b/tests/065.sh
@@ -1,8 +1,6 @@
-set -e
-
 cat <<'EOF' > expected
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int main() { ; }
 EOF
diff --git a/tests/066.sh b/tests/066.sh
index 7ff5ed5..21ef9c6 100644
--- a/tests/066.sh
+++ b/tests/066.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 8
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #include <stdarg.h>
 
 int printf();
diff --git a/tests/067.sh b/tests/067.sh
index 0abac88..fa8510f 100644
--- a/tests/067.sh
+++ b/tests/067.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 123
 460
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/068.sh b/tests/068.sh
index 648e822..b3fc394 100644
--- a/tests/068.sh
+++ b/tests/068.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 0
 1
@@ -13,7 +11,7 @@ cat <<'EOF' > expected
 81
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/069.sh b/tests/069.sh
index 2a43022..6be03e5 100644
--- a/tests/069.sh
+++ b/tests/069.sh
@@ -1,12 +1,10 @@
-set -e
-
 cat <<'EOF' > expected
 h
 l
 ,
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/070.sh b/tests/070.sh
index 9a15499..e90f1e0 100644
--- a/tests/070.sh
+++ b/tests/070.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 123
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #define foo() 123
 
 int printf();
diff --git a/tests/071.sh b/tests/071.sh
index 203ac5e..6af34ee 100644
--- a/tests/071.sh
+++ b/tests/071.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 579
 975
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #define foo 123 + 456
 #define bar() 321 + 654
 
diff --git a/tests/072.sh b/tests/072.sh
index 9e7ab9b..d82751c 100644
--- a/tests/072.sh
+++ b/tests/072.sh
@@ -1,12 +1,10 @@
-set -e
-
 cat <<'EOF' > expected
 123 456
 0 0
 123 456
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 struct S {
     int a;
     int b;
@@ -34,7 +32,7 @@ cat <<'EOF' > expected
 123 456
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 struct S {
     long a;
     long b;
@@ -62,7 +60,7 @@ cat <<'EOF' > expected
 123 456
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 struct S {
     long a;
     long b;
diff --git a/tests/073.sh b/tests/073.sh
index 3bc42af..c804692 100644
--- a/tests/073.sh
+++ b/tests/073.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 main.c
 main.c
@@ -10,7 +8,7 @@ cat <<'EOF' > header.h
 #define A __FILE__
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #define B __FILE__
 #include "header.h"
 int printf();
diff --git a/tests/074.sh b/tests/074.sh
index a4d42ea..f7ac0fe 100644
--- a/tests/074.sh
+++ b/tests/074.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 5
 6 6
@@ -10,7 +8,7 @@ cat <<'EOF' > header.h
 #define A __LINE__
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #define B __LINE__
 #include "header.h"
 int printf();
diff --git a/tests/075.sh b/tests/075.sh
index 12cf004..2f15211 100644
--- a/tests/075.sh
+++ b/tests/075.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 /* lorem ipsum */
 /*
 lorem ipsum
diff --git a/tests/076.sh b/tests/076.sh
index 065094e..71de9d7 100644
--- a/tests/076.sh
+++ b/tests/076.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 sizeof(a) = 4
 sizeof(b) = 8
@@ -8,7 +6,7 @@ sizeof(d) = 16
 sizeof(e) = 8
 sizeof(f) = 1968
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 struct S {
diff --git a/tests/077.sh b/tests/077.sh
index 4a58cb8..89cfb8c 100644
--- a/tests/077.sh
+++ b/tests/077.sh
@@ -1,9 +1,7 @@
-set -e
-
 cat <<'EOF' > expected
 0
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/078.sh b/tests/078.sh
index 3f890fd..a9ac190 100644
--- a/tests/078.sh
+++ b/tests/078.sh
@@ -1,12 +1,10 @@
-set -e
-
 cat <<'EOF' > expected
 __ducc__ is defined.
 A is defined.
 B is undefined.
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 #define A 123
diff --git a/tests/079.sh b/tests/079.sh
index 4381f45..f8f0462 100644
--- a/tests/079.sh
+++ b/tests/079.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 42
 EOF
@@ -13,7 +11,7 @@ int f() { return 42; }
 #endif
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 #include "header.h"
 #include "header.h"
 #include "header.h"
diff --git a/tests/080.sh b/tests/080.sh
index ed649da..e7fb221 100644
--- a/tests/080.sh
+++ b/tests/080.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 44
 44
@@ -10,7 +8,7 @@ cat <<'EOF' > expected
 42
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/081.sh b/tests/081.sh
index 03239bc..b298a98 100644
--- a/tests/081.sh
+++ b/tests/081.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 2 42
 8 123
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/082.sh b/tests/082.sh
index 1d7727f..d1e87d6 100644
--- a/tests/082.sh
+++ b/tests/082.sh
@@ -1,12 +1,10 @@
-set -e
-
 cat <<'EOF' > expected
 8
 42
 42
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 union U {
diff --git a/tests/083.sh b/tests/083.sh
index 7502cf3..64d03e5 100644
--- a/tests/083.sh
+++ b/tests/083.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 main.c:1: unknown preprocessor directive (foo)
 EOF
 
-bash ../../test_compile_error.sh <<'EOF'
+test_compile_error <<'EOF'
 #foo
 
 int main() {}
@@ -14,7 +12,7 @@ cat <<'EOF' > expected
 main.c:1: unknown preprocessor directive (bar)
 EOF
 
-bash ../../test_compile_error.sh <<'EOF'
+test_compile_error <<'EOF'
 # bar 1 2 3
 
 int main() {}
diff --git a/tests/084.sh b/tests/084.sh
index 3b2fe15..8b0a900 100644
--- a/tests/084.sh
+++ b/tests/084.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 A is defined
 A is undefined
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/085.sh b/tests/085.sh
index 10ab24c..9e2f32d 100644
--- a/tests/085.sh
+++ b/tests/085.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 0
 42
@@ -19,7 +17,7 @@ cat <<'EOF' > expected
 123
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int a;
diff --git a/tests/086.sh b/tests/086.sh
index ee440b5..93b1e14 100644
--- a/tests/086.sh
+++ b/tests/086.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 105
 0
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/087.sh b/tests/087.sh
index e662687..57e7612 100644
--- a/tests/087.sh
+++ b/tests/087.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 0
 1
@@ -13,7 +11,7 @@ cat <<'EOF' > expected
 9
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/088.sh b/tests/088.sh
index 6630cf0..06c88ee 100644
--- a/tests/088.sh
+++ b/tests/088.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 0
 1
@@ -15,7 +13,7 @@ cat <<'EOF' > expected
 42
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/089.sh b/tests/089.sh
index d0faca3..e467a26 100644
--- a/tests/089.sh
+++ b/tests/089.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 8
 336
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 int main() {
     printf("%d\n", 1 << 3);
@@ -16,7 +14,7 @@ cat <<'EOF' > expected
 13
 0
 EOF
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 int main() {
     printf("%d\n", 111 >> 3);
diff --git a/tests/090.sh b/tests/090.sh
index 102b9ab..e5e4df8 100644
--- a/tests/090.sh
+++ b/tests/090.sh
@@ -1,5 +1,3 @@
-set -e
-
 cat <<'EOF' > expected
 0 0
 1 1
@@ -8,7 +6,7 @@ cat <<'EOF' > expected
 4 4
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/091.sh b/tests/091.sh
index 9281811..a64c8ff 100644
--- a/tests/091.sh
+++ b/tests/091.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 2 5
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 int main() {
diff --git a/tests/092.sh b/tests/092.sh
index 00dcb44..20c3a1f 100644
--- a/tests/092.sh
+++ b/tests/092.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 42 123 999
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 char a = 42;
diff --git a/tests/093.sh b/tests/093.sh
index 50e20fa..fe0bda9 100644
--- a/tests/093.sh
+++ b/tests/093.sh
@@ -1,12 +1,10 @@
-set -e
-
 cat <<'EOF' > expected
 42
 246
 221
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 #define A(x) x
diff --git a/tests/094.sh b/tests/094.sh
index 2f7da73..ae622bc 100644
--- a/tests/094.sh
+++ b/tests/094.sh
@@ -1,7 +1,5 @@
-set -e
-
 touch expected
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 // A keyword is treated as a normal identifier in preprocessing phase.
 #define auto int
 
diff --git a/tests/095.sh b/tests/095.sh
index 65cd31a..5d274d0 100644
--- a/tests/095.sh
+++ b/tests/095.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 1 2 3 4
 0 0 5
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 int x, y, z = 5;
 int main() {
diff --git a/tests/096.sh b/tests/096.sh
index 8bd6848..7963ed7 100644
--- a/tests/096.sh
+++ b/tests/096.sh
@@ -1,11 +1,9 @@
-set -e
-
 cat <<'EOF' > expected
 10 20
 100 300 500
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 in\
 t ma\
@@ -38,4 +36,4 @@ cat <<'EOF' > expected
 main.c:1: <new-line> expected, but got <eof>
 EOF
 
-echo -n 'int main() {}\' | bash ../../test_compile_error.sh
+echo -n 'int main() {}\' | test_compile_error
diff --git a/tests/097.sh b/tests/097.sh
index 00d67f2..c5b8d0d 100644
--- a/tests/097.sh
+++ b/tests/097.sh
@@ -1,10 +1,8 @@
-set -e
-
 cat <<'EOF' > expected
 1
 EOF
 
-bash ../../test_diff.sh <<'EOF'
+test_diff <<'EOF'
 int printf();
 
 #define A
diff --git a/tests/all.sh b/tests/all.sh
index ce7ab6d..cb5df2b 100644
--- a/tests/all.sh
+++ b/tests/all.sh
@@ -11,7 +11,7 @@ for filename in tests/*.sh; do
         all|run|test_*)
             ;;
         *)
-            bash tests/run.sh "$testcase"
+            source tests/run.sh "$testcase"
             ;;
     esac
 done
diff --git a/tests/ex_fizzbuzz.sh b/tests/ex_fizzbuzz.sh
index 03d1078..b7a9e6b 100644
--- a/tests/ex_fizzbuzz.sh
+++ b/tests/ex_fizzbuzz.sh
@@ -103,4 +103,4 @@ Fizz
 Buzz
 EOF
 
-bash ../../test_example.sh fizzbuzz
+test_example fizzbuzz
diff --git a/tests/ex_hello.sh b/tests/ex_hello.sh
index 3c9e13b..750c14a 100644
--- a/tests/ex_hello.sh
+++ b/tests/ex_hello.sh
@@ -4,4 +4,4 @@ cat <<'EOF' > expected
 Hello, World!
 EOF
 
-bash ../../test_example.sh hello
+test_example hello
diff --git a/tests/run.sh b/tests/run.sh
index 0e28a96..27bd6d0 100644
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -12,7 +12,10 @@ if [[ ! -f "$test_file" ]]; then
     exit 1
 fi
 
+source tests/test_helpers.sh
+
 echo "$test_file"
 mkdir -p "$tmp_dir"
 cd "$tmp_dir"
-bash "../../../$test_file"
+source "../../../$test_file"
+cd "../../.."
diff --git a/tests/test_compile_error.sh b/tests/test_compile_error.sh
deleted file mode 100644
index 2e3c207..0000000
--- a/tests/test_compile_error.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-cat > main.c
-
-"$ducc" main.c > /dev/null 2> output
-if [[ $? -eq 0 ]]; then
-    "expected to fail"
-    exit 1
-fi
-
-diff -u expected output
diff --git a/tests/test_diff.sh b/tests/test_diff.sh
deleted file mode 100644
index adc281e..0000000
--- a/tests/test_diff.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-cat > main.c
-
-"$ducc" main.c > main.s
-if [[ $? -ne 0 ]]; then
-    exit 1
-fi
-gcc -o a.out main.s
-if [[ ! -f input ]]; then
-    touch input
-fi
-./a.out "$@" < input > output
-exit_code=$?
-
-if [[ $exit_code -ne 0 ]]; then
-    echo "invalid exit code: $exit_code" >&2
-    exit 1
-fi
-
-diff -u expected output
diff --git a/tests/test_example.sh b/tests/test_example.sh
deleted file mode 100644
index f76b606..0000000
--- a/tests/test_example.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-filename="../../../examples/$1.c"
-
-"$ducc" "$filename" > main.s
-if [[ $? -ne 0 ]]; then
-    exit 1
-fi
-gcc -o a.out main.s
-if [[ ! -f input ]]; then
-    touch input
-fi
-./a.out "$@" < input > output
-exit_code=$?
-
-if [[ $exit_code -ne 0 ]]; then
-    echo "invalid exit code: $exit_code" >&2
-    exit 1
-fi
-
-diff -u expected output
diff --git a/tests/test_exit_code.sh b/tests/test_exit_code.sh
deleted file mode 100644
index 4cdee0a..0000000
--- a/tests/test_exit_code.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-cat > main.c
-
-"$ducc" main.c > main.s
-if [[ $? -ne 0 ]]; then
-    exit 1
-fi
-gcc -o a.out main.s
-./a.out
-exit_code=$?
-
-expected=$1
-
-if [[ $exit_code -ne $expected ]]; then
-    echo "invalid exit code: expected $expected, but got $exit_code" >&2
-    exit 1
-fi
diff --git a/tests/test_helpers.sh b/tests/test_helpers.sh
new file mode 100644
index 0000000..9169c24
--- /dev/null
+++ b/tests/test_helpers.sh
@@ -0,0 +1,81 @@
+function test_exit_code() {
+    set +e
+    cat > main.c
+
+    "$ducc" main.c > main.s
+    if [[ $? -ne 0 ]]; then
+        set -e
+        exit 1
+    fi
+    gcc -o a.out main.s
+    ./a.out
+    exit_code=$?
+
+    expected=$1
+
+    if [[ $exit_code -ne $expected ]]; then
+        echo "invalid exit code: expected $expected, but got $exit_code" >&2
+        set -e
+        exit 1
+    fi
+    set -e
+}
+
+function test_diff() {
+    cat > main.c
+
+    "$ducc" main.c > main.s
+    if [[ $? -ne 0 ]]; then
+        exit 1
+    fi
+    gcc -o a.out main.s
+    if [[ ! -f input ]]; then
+        touch input
+    fi
+    ./a.out "$@" < input > output
+    exit_code=$?
+
+    if [[ $exit_code -ne 0 ]]; then
+        echo "invalid exit code: $exit_code" >&2
+        exit 1
+    fi
+
+    diff -u expected output
+}
+
+function test_compile_error() {
+    set +e
+    cat > main.c
+
+    "$ducc" main.c > /dev/null 2> output
+    if [[ $? -eq 0 ]]; then
+        "expected to fail"
+        set -e
+        exit 1
+    fi
+
+    diff -u expected output
+    set -e
+}
+
+function test_example() {
+    filename="../../../examples/$1.c"
+
+    "$ducc" "$filename" > main.s
+    if [[ $? -ne 0 ]]; then
+        exit 1
+    fi
+    gcc -o a.out main.s
+    if [[ ! -f input ]]; then
+        touch input
+    fi
+    ./a.out "$@" < input > output
+    exit_code=$?
+
+    if [[ $exit_code -ne 0 ]]; then
+        echo "invalid exit code: $exit_code" >&2
+        exit 1
+    fi
+
+    diff -u expected output
+}