1 files changed, 31 insertions, 0 deletions
diff --git a/thirdparty/utfcpp/tests/test_checked_iterator.cpp b/thirdparty/utfcpp/tests/test_checked_iterator.cpp
new file mode 100644
index 000000000..4c44834fd
--- /dev/null
+++ b/thirdparty/utfcpp/tests/test_checked_iterator.cpp
@@ -0,0 +1,31 @@
+#include "gtest/gtest.h"
+#include "utf8.h"
+
+using namespace utf8;
+
+
+TEST(CheckedIteratrTests, test_increment)
+{
+    const char* threechars = "\xf0\x90\x8d\x86\xe6\x97\xa5\xd1\x88";
+    utf8::iterator<const char*> it(threechars, threechars, threechars + 9);
+    utf8::iterator<const char*> it2 = it;
+    EXPECT_EQ (it2, it);
+    EXPECT_EQ (*it, 0x10346);
+    EXPECT_EQ (*(++it), 0x65e5);
+    EXPECT_EQ ((*it++), 0x65e5);
+    EXPECT_EQ (*it, 0x0448);
+    EXPECT_NE (it, it2);
+    utf8::iterator<const char*> endit (threechars + 9, threechars, threechars + 9);
+    EXPECT_EQ (++it, endit);
+}
+
+TEST(CheckedIteratrTests, test_decrement)
+{
+    const char* threechars = "\xf0\x90\x8d\x86\xe6\x97\xa5\xd1\x88";
+    utf8::iterator<const char*> it(threechars+9, threechars, threechars + 9);
+    EXPECT_EQ (*(--it), 0x0448);
+    EXPECT_EQ ((*it--), 0x0448);
+    EXPECT_EQ (*it, 0x65e5);
+    EXPECT_EQ (--it, utf8::iterator<const char*>(threechars, threechars, threechars + 9));
+    EXPECT_EQ (*it, 0x10346);
+}