ci(test): unit tests for label widget (#3529)

* test(label) Add initial test for constructor * test(label) Add tests for recolor * cleanup(label): lv_label_event * test(label) set text tests * test(label) Add tests for lv_label_get_letter_pos * chore(label) Const where possible in lv_label_get_letter_pos * test(label) Add tests for lv_label_is_char_under_pos * chore(label) Add const when possible to lv_label_is_char_under_pos * test(label) Add simple test for lv_label_cut_text * chore(label) Cleanup lv_label_revert_dots a bit * test(label) Make tests pass on Build OPTIONS_MINIMAL_MONOCHROME * test(label) Initial tests for lv_label_get_letter_on * chore(label) Introduce calculate_x_coordinate helper * chore(label) Use calculate_x_coordinate in lv_label_get_letter_on * chore(label) Reduce varible scope in lv_label_get_letter_on * chore(label) Use calculate_x_coordinate in lv_label_get_letter_pos This also reduces complexity of lv_label_get_letter_pos from 21 to 19 (measured using python package 'ravioli') * chore(label) Remove extra lv_anim_set_exec_cb on lv_label_refr_text * chore(label) Minor edits on docs * test(label): Remove unfinished tests * test(label): Add tests for text selection * Update lv_label.c Fix formatting
2022-08-17 06:22:29 -05:00
parent e93e210b41
commit b878a1aed9
3 changed files with 710 additions and 125 deletions
--- a/tests/src/test_cases/test_label.c
+++ b/tests/src/test_cases/test_label.c
@@ -0,0 +1,580 @@
+#if LV_BUILD_TEST
+#include "../lvgl.h"
+
+#include "unity/unity.h"
+
+static const char * long_text =
+    "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras malesuada ultrices magna in rutrum.";
+static const char * long_text_multiline =
+    "Lorem ipsum dolor sit amet,\nconsectetur adipiscing elit.\nCras malesuada ultrices magna in rutrum.\n";
+static const char * empty_text = "";
+
+static lv_obj_t * active_screen = NULL;
+static lv_obj_t * label;
+static lv_obj_t * long_label;
+static lv_obj_t * long_label_multiline;
+static lv_obj_t * empty_label;
+
+void setUp(void)
+{
+    active_screen = lv_scr_act();
+    label = lv_label_create(active_screen);
+    long_label = lv_label_create(active_screen);
+    long_label_multiline = lv_label_create(active_screen);
+    empty_label = lv_label_create(active_screen);
+
+    lv_label_set_text(long_label, long_text);
+    lv_label_set_text(long_label_multiline, long_text_multiline);
+    lv_label_set_text(empty_label, empty_text);
+}
+
+void tearDown(void)
+{
+    lv_obj_del(label);
+    lv_obj_del(long_label);
+    lv_obj_del(long_label_multiline);
+    lv_obj_del(empty_label);
+}
+
+void test_label_creation(void)
+{
+    TEST_ASSERT_EQUAL_STRING(lv_label_get_text(label), LV_LABEL_DEFAULT_TEXT);
+    TEST_ASSERT_EQUAL(lv_label_get_long_mode(label), LV_LABEL_LONG_WRAP);
+}
+
+void test_label_recolor(void)
+{
+    lv_label_set_recolor(label, true);
+    TEST_ASSERT(lv_label_get_recolor(label));
+
+    lv_label_set_recolor(label, false);
+    TEST_ASSERT_FALSE(lv_label_get_recolor(label));
+}
+
+void test_label_set_text(void)
+{
+    const char * new_text = "Hello world";
+
+    /* Refresh with the current text. */
+    lv_label_set_text(label, NULL);
+    TEST_ASSERT_EQUAL_STRING(lv_label_get_text(label), LV_LABEL_DEFAULT_TEXT);
+
+    /* '\0' terminated character string to set new text. */
+    lv_label_set_text(label, new_text);
+    TEST_ASSERT_EQUAL_STRING(lv_label_get_text(label), new_text);
+}
+
+void test_label_get_letter_pos_align_left(void)
+{
+    lv_obj_set_style_text_align(label, LV_TEXT_ALIGN_LEFT, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = 0,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = 29,
+        .y = 0
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(long_label_multiline)) - 1; /* char index starts at 0 */
+
+    lv_label_get_letter_pos(label, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(label, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+}
+
+void test_label_get_letter_pos_align_left_on_empty_text(void)
+{
+    lv_obj_set_style_text_align(empty_label, LV_TEXT_ALIGN_LEFT, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = 0,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = 0,
+        .y = 0
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(empty_label)) - 1;
+
+    lv_label_get_letter_pos(empty_label, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(empty_label, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+}
+
+void test_label_long_text_multiline_get_letter_pos_align_left(void)
+{
+    lv_obj_set_style_text_align(long_label_multiline, LV_TEXT_ALIGN_LEFT, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    lv_point_t last_letter_after_new_line_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = 0,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = 305,
+        .y = 32
+    };
+    const lv_point_t expected_last_letter_after_new_line_point = {
+        .x = 0,
+        .y = 48
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(long_label_multiline)) - 1; /* char index starts at 0 */
+    const uint32_t last_letter_after_new_line = strlen(lv_label_get_text(long_label_multiline));
+
+    lv_label_get_letter_pos(long_label_multiline, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(long_label_multiline, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+
+    lv_label_get_letter_pos(long_label_multiline, last_letter_after_new_line, &last_letter_after_new_line_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_after_new_line_point.x, last_letter_after_new_line_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_after_new_line_point.y, last_letter_after_new_line_point.y);
+}
+
+void test_label_long_text_get_letter_pos_align_left(void)
+{
+    lv_label_set_long_mode(long_label, LV_LABEL_LONG_WRAP);
+    lv_obj_set_width(long_label, 150);
+    lv_obj_set_height(long_label, 500);
+    lv_obj_set_style_text_align(long_label, LV_TEXT_ALIGN_LEFT, _LV_STYLE_STATE_CMP_SAME);
+
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = 0,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = 0,
+        .y = 1536
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(long_label)) - 1; /* char index starts at 0 */
+
+    lv_label_get_letter_pos(long_label, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(long_label, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+}
+
+void test_label_get_letter_pos_align_right(void)
+{
+    lv_obj_set_style_text_align(label, LV_TEXT_ALIGN_RIGHT, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = -29,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = 0,
+        .y = 0
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(long_label_multiline)) - 1; /* char index starts at 0 */
+
+    lv_label_get_letter_pos(label, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(label, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+}
+
+void test_label_get_letter_pos_align_right_on_empty_text(void)
+{
+    lv_obj_set_style_text_align(empty_label, LV_TEXT_ALIGN_RIGHT, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = 0,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = 0,
+        .y = 0
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(empty_label)) - 1;
+
+    lv_label_get_letter_pos(empty_label, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(empty_label, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+}
+
+void test_label_long_text_multiline_get_letter_pos_align_right(void)
+{
+    lv_obj_set_style_text_align(long_label_multiline, LV_TEXT_ALIGN_RIGHT, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    lv_point_t last_letter_after_new_line_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = -205,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = 0,
+        .y = 32
+    };
+    const lv_point_t expected_last_letter_after_new_line_point = {
+        .x = 0,
+        .y = 48
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(long_label_multiline)) - 1; /* char index starts at 0 */
+    const uint32_t last_letter_after_new_line = strlen(lv_label_get_text(long_label_multiline));
+
+    lv_label_get_letter_pos(long_label_multiline, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(long_label_multiline, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+
+    lv_label_get_letter_pos(long_label_multiline, last_letter_after_new_line, &last_letter_after_new_line_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_after_new_line_point.x, last_letter_after_new_line_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_after_new_line_point.y, last_letter_after_new_line_point.y);
+}
+
+void test_label_long_text_get_letter_pos_align_right(void)
+{
+    lv_label_set_long_mode(long_label, LV_LABEL_LONG_WRAP);
+    lv_obj_set_width(long_label, 150);
+    lv_obj_set_height(long_label, 500);
+    lv_obj_set_style_text_align(long_label, LV_TEXT_ALIGN_RIGHT, _LV_STYLE_STATE_CMP_SAME);
+
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = -8,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = -3,
+        .y = 1536
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(long_label)) - 1; /* char index starts at 0 */
+
+    lv_label_get_letter_pos(long_label, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(long_label, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+}
+
+void test_label_get_letter_pos_align_center(void)
+{
+    lv_obj_set_style_text_align(label, LV_TEXT_ALIGN_CENTER, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = -14,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = 15,
+        .y = 0
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(long_label_multiline)) - 1; /* char index starts at 0 */
+
+    lv_label_get_letter_pos(label, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(label, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+}
+
+void test_label_get_letter_pos_align_center_on_empty_text(void)
+{
+    lv_obj_set_style_text_align(empty_label, LV_TEXT_ALIGN_CENTER, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = 0,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = 0,
+        .y = 0
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(empty_label)) - 1;
+
+    lv_label_get_letter_pos(empty_label, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(empty_label, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+}
+
+void test_label_long_text_multiline_get_letter_pos_align_center(void)
+{
+    lv_obj_set_style_text_align(long_label_multiline, LV_TEXT_ALIGN_CENTER, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    lv_point_t last_letter_after_new_line_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = -102,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = 153,
+        .y = 32
+    };
+    const lv_point_t expected_last_letter_after_new_line_point = {
+        .x = 0,
+        .y = 48
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(long_label_multiline)) - 1; /* char index starts at 0 */
+    const uint32_t last_letter_after_new_line = strlen(lv_label_get_text(long_label_multiline));
+
+    lv_label_get_letter_pos(long_label_multiline, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(long_label_multiline, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+
+    lv_label_get_letter_pos(long_label_multiline, last_letter_after_new_line, &last_letter_after_new_line_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_after_new_line_point.x, last_letter_after_new_line_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_after_new_line_point.y, last_letter_after_new_line_point.y);
+}
+
+void test_label_long_text_get_letter_pos_align_center(void)
+{
+    lv_label_set_long_mode(long_label, LV_LABEL_LONG_WRAP);
+    lv_obj_set_width(long_label, 150);
+    lv_obj_set_height(long_label, 500);
+    lv_obj_set_style_text_align(long_label, LV_TEXT_ALIGN_CENTER, _LV_STYLE_STATE_CMP_SAME);
+
+    lv_point_t first_letter_point;
+    lv_point_t last_letter_point;
+    const lv_point_t expected_first_letter_point = {
+        .x = -4,
+        .y = 0
+    };
+    const lv_point_t expected_last_letter_point = {
+        .x = -1,
+        .y = 1536
+    };
+
+    const uint32_t first_letter_idx = 0;
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(long_label)) - 1; /* char index starts at 0 */
+
+    lv_label_get_letter_pos(long_label, first_letter_idx, &first_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_first_letter_point.x, first_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_first_letter_point.y, first_letter_point.y);
+
+    lv_label_get_letter_pos(long_label, last_letter_idx, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(expected_last_letter_point.x, last_letter_point.x);
+    TEST_ASSERT_EQUAL(expected_last_letter_point.y, last_letter_point.y);
+}
+
+void test_label_is_char_under_pos_align_left(void)
+{
+    lv_obj_set_style_text_align(label, LV_TEXT_ALIGN_LEFT, _LV_STYLE_STATE_CMP_SAME);
+    bool expected_result = true;
+    bool result = false;
+    lv_point_t last_letter_point;
+
+    /* Getting the last letter point */
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(label)) - 1;
+    lv_label_get_letter_pos(label, last_letter_idx, &last_letter_point);
+
+    /* We should get true, since we know the last letter is in this coordinate */
+    result = lv_label_is_char_under_pos(label, &last_letter_point);
+    TEST_ASSERT_EQUAL(expected_result, result);
+
+    /* If we test a move away from the last letter then we should get false */
+    expected_result = false;
+    last_letter_point.x += 50;
+
+    result = lv_label_is_char_under_pos(label, &last_letter_point);
+    TEST_ASSERT_EQUAL(expected_result, result);
+}
+
+void test_label_is_char_under_pos_align_right(void)
+{
+    lv_obj_set_style_text_align(label, LV_TEXT_ALIGN_RIGHT, _LV_STYLE_STATE_CMP_SAME);
+    bool expected_result = true;
+    bool result = false;
+    lv_point_t last_letter_point;
+
+    /* Getting the last letter point */
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(label)) - 1;
+    lv_label_get_letter_pos(label, last_letter_idx, &last_letter_point);
+
+    /* We should get true, since we know the last letter is in this coordinate */
+    result = lv_label_is_char_under_pos(label, &last_letter_point);
+    TEST_ASSERT_EQUAL(expected_result, result);
+
+    /* If we test a move away from the last letter then we should get false */
+    expected_result = false;
+    last_letter_point.x -= 50;
+
+    result = lv_label_is_char_under_pos(label, &last_letter_point);
+    TEST_ASSERT_EQUAL(expected_result, result);
+}
+
+void test_label_is_char_under_pos_align_center(void)
+{
+    lv_obj_set_style_text_align(label, LV_TEXT_ALIGN_CENTER, _LV_STYLE_STATE_CMP_SAME);
+    bool expected_result = true;
+    bool result = false;
+    lv_point_t last_letter_point;
+
+    /* Getting the last letter point */
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(label)) - 1;
+    lv_label_get_letter_pos(label, last_letter_idx, &last_letter_point);
+
+    /* We should get true, since we know the last letter is in this coordinate */
+    result = lv_label_is_char_under_pos(label, &last_letter_point);
+    TEST_ASSERT_EQUAL(expected_result, result);
+
+    /* If we test a move away from the last letter then we should get false */
+    expected_result = false;
+    last_letter_point.x -= 50;
+
+    result = lv_label_is_char_under_pos(label, &last_letter_point);
+    TEST_ASSERT_EQUAL(expected_result, result);
+}
+
+void test_label_cut_text(void)
+{
+    const char * expected_text = "Te";
+    /* label has the default text which is "Text", let's remove "xt" from it */
+    lv_label_cut_text(label, 2, 2);
+
+    TEST_ASSERT_EQUAL_STRING(expected_text, lv_label_get_text(label));
+}
+
+void test_label_get_letter_on_left(void)
+{
+    lv_obj_set_style_text_align(label, LV_TEXT_ALIGN_LEFT, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t last_letter_point;
+
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(label)) - 1;
+    lv_label_get_letter_pos(label, last_letter_idx, &last_letter_point);
+
+    uint32_t letter_idx_result = lv_label_get_letter_on(label, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(last_letter_idx, letter_idx_result);
+}
+
+void test_label_get_letter_on_center(void)
+{
+    lv_obj_set_style_text_align(label, LV_TEXT_ALIGN_CENTER, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t last_letter_point;
+
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(label)) - 1;
+    lv_label_get_letter_pos(label, last_letter_idx, &last_letter_point);
+
+    uint32_t letter_idx_result = lv_label_get_letter_on(label, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(last_letter_idx, letter_idx_result);
+}
+
+void test_label_get_letter_on_right(void)
+{
+    lv_obj_set_style_text_align(label, LV_TEXT_ALIGN_RIGHT, _LV_STYLE_STATE_CMP_SAME);
+    lv_point_t last_letter_point;
+
+    const uint32_t last_letter_idx = strlen(lv_label_get_text(label)) - 1;
+    lv_label_get_letter_pos(label, last_letter_idx, &last_letter_point);
+
+    uint32_t letter_idx_result = lv_label_get_letter_on(label, &last_letter_point);
+
+    TEST_ASSERT_EQUAL(last_letter_idx, letter_idx_result);
+}
+
+void test_label_text_selection(void)
+{
+    const uint32_t selection_start = 0;
+    const uint32_t selection_end = strlen(lv_label_get_text(label)) - 1;
+
+    lv_label_set_text_sel_start(label, selection_start);
+    lv_label_set_text_sel_end(label, selection_end);
+
+    uint32_t start = lv_label_get_text_selection_start(label);
+    uint32_t end = lv_label_get_text_selection_end(label);
+
+    TEST_ASSERT_EQUAL(selection_start, start);
+    TEST_ASSERT_EQUAL(selection_end, end);
+}
+
+#endif