3 files changed, 55 insertions, 0 deletions
diff --git a/tests/test_common.c b/tests/test_common.c
index bac03cfd..0c4530a0 100644
--- a/tests/test_common.c
+++ b/tests/test_common.c
@@ -544,3 +544,46 @@ void test_p_sha1_hash7(void **state)
 
     assert_string_equal(result, "bNfKVfqEOGmzlH8M+e8FYTB46SU=");
 }
+
+void utf8_display_len_null_str(void **state)
+{
+    int result = utf8_display_len(NULL);
+
+    assert_int_equal(0, result);
+}
+
+void utf8_display_len_1_non_wide(void **state)
+{
+    int result = utf8_display_len("1");
+
+    assert_int_equal(1, result);
+}
+
+void utf8_display_len_1_wide(void **state)
+{
+    int result = utf8_display_len("四");
+
+    assert_int_equal(2, result);
+}
+
+void utf8_display_len_non_wide(void **state)
+{
+    int result = utf8_display_len("123456789abcdef");
+
+    assert_int_equal(15, result);
+}
+
+void utf8_display_len_wide(void **state)
+{
+    int result = utf8_display_len("12三四56");
+
+    assert_int_equal(8, result);
+}
+
+void utf8_display_len_all_wide(void **state)
+{
+    int result = utf8_display_len("ひらがな");
+
+    assert_int_equal(8, result);
+}
+
diff --git a/tests/test_common.h b/tests/test_common.h
index 8b5128fd..1866e73d 100644
--- a/tests/test_common.h
+++ b/tests/test_common.h
@@ -46,3 +46,9 @@ void test_p_sha1_hash5(void **state);
 void test_p_sha1_hash6(void **state);
 void test_p_sha1_hash6(void **state);
 void test_p_sha1_hash7(void **state);
+void utf8_display_len_null_str(void **state);
+void utf8_display_len_1_non_wide(void **state);
+void utf8_display_len_1_wide(void **state);
+void utf8_display_len_non_wide(void **state);
+void utf8_display_len_wide(void **state);
+void utf8_display_len_all_wide(void **state);
\ No newline at end of file
diff --git a/tests/testsuite.c b/tests/testsuite.c
index 32d298cf..cf511c59 100644
--- a/tests/testsuite.c
+++ b/tests/testsuite.c
@@ -85,6 +85,12 @@ int main(int argc, char* argv[]) {
         unit_test(test_p_sha1_hash5),
         unit_test(test_p_sha1_hash6),
         unit_test(test_p_sha1_hash7),
+        unit_test(utf8_display_len_null_str),
+        unit_test(utf8_display_len_1_non_wide),
+        unit_test(utf8_display_len_1_wide),
+        unit_test(utf8_display_len_non_wide),
+        unit_test(utf8_display_len_wide),
+        unit_test(utf8_display_len_all_wide),
 
         unit_test(clear_empty),
         unit_test(reset_after_create),