diff --git a/backend/tests/test_bmp.c b/backend/tests/test_bmp.c
index 62693beb..283d7c8e 100644
--- a/backend/tests/test_bmp.c
+++ b/backend/tests/test_bmp.c
@@ -142,9 +142,11 @@ static void test_print(int index, int generate, int debug) {
     int escaped_size = 1024;
 
     if (generate) {
-        if (!testUtilExists(data_dir)) {
-            ret = testutil_mkdir(data_dir, 0755);
-            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir, ret, errno, strerror(errno));
+        char data_dir_path[1024];
+        assert_nonzero(testUtilDataPath(data_dir_path, sizeof(data_dir_path), data_dir, NULL), "testUtilDataPath(%s) == 0\n", data_dir);
+        if (!testUtilExists(data_dir_path)) {
+            ret = testutil_mkdir(data_dir_path, 0755);
+            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir_path, ret, errno, strerror(errno));
         }
     }
 
diff --git a/backend/tests/test_emf.c b/backend/tests/test_emf.c
index 74e3f853..962c22db 100644
--- a/backend/tests/test_emf.c
+++ b/backend/tests/test_emf.c
@@ -80,9 +80,11 @@ static void test_print(int index, int generate, int debug) {
     int escaped_size = 1024;
 
     if (generate) {
-        if (!testUtilExists(data_dir)) {
-            ret = testutil_mkdir(data_dir, 0755);
-            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir, ret, errno, strerror(errno));
+        char data_dir_path[1024];
+        assert_nonzero(testUtilDataPath(data_dir_path, sizeof(data_dir_path), data_dir, NULL), "testUtilDataPath(%s) == 0\n", data_dir);
+        if (!testUtilExists(data_dir_path)) {
+            ret = testutil_mkdir(data_dir_path, 0755);
+            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir_path, ret, errno, strerror(errno));
         }
     }
 
diff --git a/backend/tests/test_png.c b/backend/tests/test_png.c
index 190c3934..73839cf4 100644
--- a/backend/tests/test_png.c
+++ b/backend/tests/test_png.c
@@ -196,9 +196,11 @@ static void test_print(int index, int generate, int debug) {
     char *text;
 
     if (generate) {
-        if (!testUtilExists(data_dir)) {
-            ret = testutil_mkdir(data_dir, 0755);
-            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir, ret, errno, strerror(errno));
+        char data_dir_path[1024];
+        assert_nonzero(testUtilDataPath(data_dir_path, sizeof(data_dir_path), data_dir, NULL), "testUtilDataPath(%s) == 0\n", data_dir);
+        if (!testUtilExists(data_dir_path)) {
+            ret = testutil_mkdir(data_dir_path, 0755);
+            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir_path, ret, errno, strerror(errno));
         }
     }
 
diff --git a/backend/tests/test_ps.c b/backend/tests/test_ps.c
index a1b347ca..98955abf 100644
--- a/backend/tests/test_ps.c
+++ b/backend/tests/test_ps.c
@@ -71,9 +71,11 @@ static void test_print(int index, int generate, int debug) {
     int escaped_size = 1024;
 
     if (generate) {
-        if (!testUtilExists(data_dir)) {
-            ret = testutil_mkdir(data_dir, 0755);
-            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir, ret, errno, strerror(errno));
+        char data_dir_path[1024];
+        assert_nonzero(testUtilDataPath(data_dir_path, sizeof(data_dir_path), data_dir, NULL), "testUtilDataPath(%s) == 0\n", data_dir);
+        if (!testUtilExists(data_dir_path)) {
+            ret = testutil_mkdir(data_dir_path, 0755);
+            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir_path, ret, errno, strerror(errno));
         }
     }
 
diff --git a/backend/tests/test_svg.c b/backend/tests/test_svg.c
index 1f456f41..7114741a 100644
--- a/backend/tests/test_svg.c
+++ b/backend/tests/test_svg.c
@@ -111,9 +111,11 @@ static void test_print(int index, int generate, int debug) {
     char *text;
 
     if (generate) {
-        if (!testUtilExists(data_dir)) {
-            ret = testutil_mkdir(data_dir, 0755);
-            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir, ret, errno, strerror(errno));
+        char data_dir_path[1024];
+        assert_nonzero(testUtilDataPath(data_dir_path, sizeof(data_dir_path), data_dir, NULL), "testUtilDataPath(%s) == 0\n", data_dir);
+        if (!testUtilExists(data_dir_path)) {
+            ret = testutil_mkdir(data_dir_path, 0755);
+            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir_path, ret, errno, strerror(errno));
         }
     }
 
diff --git a/backend/tests/test_tif.c b/backend/tests/test_tif.c
index b83d2bc9..75ca0092 100644
--- a/backend/tests/test_tif.c
+++ b/backend/tests/test_tif.c
@@ -190,9 +190,11 @@ static void test_print(int index, int generate, int debug) {
     char *text;
 
     if (generate) {
-        if (!testUtilExists(data_dir)) {
-            ret = testutil_mkdir(data_dir, 0755);
-            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir, ret, errno, strerror(errno));
+        char data_dir_path[1024];
+        assert_nonzero(testUtilDataPath(data_dir_path, sizeof(data_dir_path), data_dir, NULL), "testUtilDataPath(%s) == 0\n", data_dir);
+        if (!testUtilExists(data_dir_path)) {
+            ret = testutil_mkdir(data_dir_path, 0755);
+            assert_zero(ret, "testutil_mkdir(%s) ret %d != 0 (%d: %s)\n", data_dir_path, ret, errno, strerror(errno));
         }
     }