Function test_utf8_width__strnwidth_chinese

t/unit-tests/u-utf8-width.c:9–42

* Test utf8_strnwidth with various Chinese strings * Chinese characters typically have a width of 2 columns when displayed */

 * Chinese characters typically have a width of 2 columns when displayed
 */
void test_utf8_width__strnwidth_chinese(void)
{
	const char *str;

	/* Test basic ASCII - each character should have width 1 */
	cl_assert_equal_i(5, utf8_strnwidth("Hello", 5, 0));
	/* skip_ansi = 1 */
	cl_assert_equal_i(5, utf8_strnwidth("Hello", 5, 1));

	/* Test simple Chinese characters - each should have width 2 */
	/* "你好" is 6 bytes (3 bytes per char in UTF-8), 4 display columns */
	cl_assert_equal_i(4, utf8_strnwidth("你好", 6, 0));

	/* Test mixed ASCII and Chinese - ASCII = 1 column, Chinese = 2 columns */
	/* "h"(1) + "i"(1) + "你"(2) + "好"(2) = 6 */
	cl_assert_equal_i(6, utf8_strnwidth("Hi你好", 8, 0));

	/* Test longer Chinese string */
	/* 5 Chinese chars = 10 display columns */
	cl_assert_equal_i(10, utf8_strnwidth("你好世界！", 15, 0));

	/* Test individual Chinese character width */
	cl_assert_equal_i(2, utf8_strnwidth("中", 3, 0));

	/* Test empty string */
	cl_assert_equal_i(0, utf8_strnwidth("", 0, 0));

	/* Test length limiting */
	str = "你好世界";
	/* Only first char "你"(2 columns) within 3 bytes */
	cl_assert_equal_i(2, utf8_strnwidth(str, 3, 0));
	/* First two chars "你好"(4 columns) in 6 bytes */
	cl_assert_equal_i(4, utf8_strnwidth(str, 6, 0));
}

/*
 * Tests for utf8_strwidth (simpler version without length limit)