1 files changed, 50 insertions, 0 deletions
diff --git a/core/fxcrt/fx_extension_unittest.cpp b/core/fxcrt/fx_extension_unittest.cpp
index 1bc3ec6298..38b66ba2d2 100644
--- a/core/fxcrt/fx_extension_unittest.cpp
+++ b/core/fxcrt/fx_extension_unittest.cpp
@@ -39,3 +39,53 @@ TEST(fxcrt, FX_HashCode_Wide) {
   EXPECT_EQ(97u, FX_HashCode_GetW(L"A", true));
   EXPECT_EQ(1313 * 65u + 66u, FX_HashCode_GetW(L"AB", false));
 }
+
+TEST(fxcrt, FXSYS_IntToTwoHexChars) {
+  char buf[3] = {0};
+  FXSYS_IntToTwoHexChars(0x0, buf);
+  EXPECT_STREQ("00", buf);
+  FXSYS_IntToTwoHexChars(0x9, buf);
+  EXPECT_STREQ("09", buf);
+  FXSYS_IntToTwoHexChars(0xA, buf);
+  EXPECT_STREQ("0A", buf);
+  FXSYS_IntToTwoHexChars(0x8C, buf);
+  EXPECT_STREQ("8C", buf);
+  FXSYS_IntToTwoHexChars(0xBE, buf);
+  EXPECT_STREQ("BE", buf);
+  FXSYS_IntToTwoHexChars(0xD0, buf);
+  EXPECT_STREQ("D0", buf);
+  FXSYS_IntToTwoHexChars(0xFF, buf);
+  EXPECT_STREQ("FF", buf);
+}
+
+TEST(fxcrt, FXSYS_IntToFourHexChars) {
+  char buf[5] = {0};
+  FXSYS_IntToFourHexChars(0x0, buf);
+  EXPECT_STREQ("0000", buf);
+  FXSYS_IntToFourHexChars(0xA23, buf);
+  EXPECT_STREQ("0A23", buf);
+  FXSYS_IntToFourHexChars(0xB701, buf);
+  EXPECT_STREQ("B701", buf);
+  FXSYS_IntToFourHexChars(0xFFFF, buf);
+  EXPECT_STREQ("FFFF", buf);
+}
+
+TEST(fxcrt, FXSYS_ToUTF16BE) {
+  char buf[9] = {0};
+  // Test U+0000 to U+D7FF and U+E000 to U+FFFF
+  EXPECT_EQ(4U, FXSYS_ToUTF16BE(0x0, buf));
+  EXPECT_STREQ("0000", buf);
+  EXPECT_EQ(4U, FXSYS_ToUTF16BE(0xD7FF, buf));
+  EXPECT_STREQ("D7FF", buf);
+  EXPECT_EQ(4U, FXSYS_ToUTF16BE(0xE000, buf));
+  EXPECT_STREQ("E000", buf);
+  EXPECT_EQ(4U, FXSYS_ToUTF16BE(0xFFFF, buf));
+  EXPECT_STREQ("FFFF", buf);
+  // Test U+10000 to U+10FFFF
+  EXPECT_EQ(8U, FXSYS_ToUTF16BE(0x10000, buf));
+  EXPECT_STREQ("D800DC00", buf);
+  EXPECT_EQ(8U, FXSYS_ToUTF16BE(0x10FFFF, buf));
+  EXPECT_STREQ("DBFFDFFF", buf);
+  EXPECT_EQ(8U, FXSYS_ToUTF16BE(0x2003E, buf));
+  EXPECT_STREQ("D840DC3E", buf);
+}