diff --git a/tests/include/random.h b/tests/include/random.h
index fa24373..69b2b07 100644
--- a/tests/include/random.h
+++ b/tests/include/random.h
@@ -23,4 +23,6 @@ extern vtype_int16 random_int16();
 extern vtype_int32 random_int32();
 extern vtype_int64 random_int64();
 
+extern char random_ascii_char();
+extern unsigned int random_unicode_symbol();
 #endif /* LIBCDSB_TESTS_RANDOM_H */
diff --git a/tests/src/random.c b/tests/src/random.c
index 1fa5a28..c77e74a 100644
--- a/tests/src/random.c
+++ b/tests/src/random.c
@@ -79,3 +79,33 @@ vtype_uint64 random_uint64() {
 vtype_int64  random_int64() {
     return random_uint32() * random_uint32();
 }
+
+char random_ascii_char() {
+    return (rand()%0x5f) + 0x20;
+}
+
+unsigned int random_unicode_symbol() {
+    switch (rand()%20) {
+        default:
+        case  0: return (random_uint16()%0x005f) + 0x000020;
+        case  1: return (random_uint16()%0x020f) + 0x0000a1;
+        case  2: return (random_uint16()%0x01a8) + 0x000388;
+        case  3: return (random_uint16()%0x0026) + 0x000531;
+        case  4: return (random_uint16()%0x002a) + 0x000560;
+        case  5: return (random_uint16()%0x00c6) + 0x001000;
+        case  6: return (random_uint16()%0x0030) + 0x0010d0;
+        case  7: return (random_uint16()%0x029d) + 0x001400;
+        case  8: return (random_uint16()%0x0058) + 0x0016a0;
+        case  9: return (random_uint16()%0x0074) + 0x001b80;
+        case 10: return (random_uint16()%0x00f4) + 0x001d00;
+        case 11: return (random_uint16()%0x0115) + 0x001e00;
+        case 12: return (random_uint16()%0x008b) + 0x002100;
+        case 13: return (random_uint16()%0x0297) + 0x002190;
+        case 14: return (random_uint16()%0x0714) + 0x002460;
+        case 15: return (random_uint16()%0x00b7) + 0x00a640;
+        case 16: return (random_uint16()%0x0074) + 0x00a8e0;
+        case 17: return (random_uint16()%0x009e) + 0x010400;
+        case 18: return (random_uint16()%0x0137) + 0x010600;
+        case 19: return (random_uint16()%0x03d8) + 0x01f300;
+    }
+}