utils: add get_last_x_chars()

Reviewed-by: Pavel Březina <pbrezina@redhat.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/tests/cmocka/test_string_utils.c b/src/tests/cmocka/test_string_utils.c
index 5d3fcf4fe..4832015a5 100644
--- a/src/tests/cmocka/test_string_utils.c
+++ b/src/tests/cmocka/test_string_utils.c
@@ -192,3 +192,31 @@ void test_guid_blob_to_string_buf(void **state)
         assert_string_equal(test_data[c].guid_str, str_buf);
     }
 }
+
+void test_get_last_x_chars(void **state)
+{
+    const char *s;
+
+    s = get_last_x_chars(NULL, 0);
+    assert_null(s);
+
+    s = get_last_x_chars("abc", 0);
+    assert_non_null(s);
+    assert_string_equal(s, "");
+
+    s = get_last_x_chars("abc", 1);
+    assert_non_null(s);
+    assert_string_equal(s, "c");
+
+    s = get_last_x_chars("abc", 2);
+    assert_non_null(s);
+    assert_string_equal(s, "bc");
+
+    s = get_last_x_chars("abc", 3);
+    assert_non_null(s);
+    assert_string_equal(s, "abc");
+
+    s = get_last_x_chars("abc", 4);
+    assert_non_null(s);
+    assert_string_equal(s, "abc");
+}