Fix integer truncation in Character test functions

third_party/WebKit/Source/platform/fonts/CharacterTest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/fonts/Character.h"
 
 #include "platform/Logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/text/CharacterNames.h"
 
@@ skipping 368 matching lines @@
     EXPECT_FALSE(Character::isEmojiModifierBase('A'));
     EXPECT_FALSE(Character::isEmojiModifierBase(0x1F47D));
 }
 
 TEST(CharacterTest, LineBreakAndQuoteNotEmoji)
 {
     EXPECT_FALSE(Character::isEmojiTextPresentation('\n'));
     EXPECT_FALSE(Character::isEmojiTextPresentation('"'));
 }
 
+TEST(CharacterTest, Truncation)
+{
+    const UChar32 base = 0x90000;
+    UChar32 testChar = 0;
+
+    testChar = base + spaceCharacter;
+    EXPECT_FALSE(Character::treatAsSpace(testChar));
+    testChar = base + noBreakSpaceCharacter;
+    EXPECT_FALSE(Character::treatAsSpace(testChar));
+
+    testChar = base + zeroWidthNonJoinerCharacter;
+    EXPECT_FALSE(Character::treatAsZeroWidthSpace(testChar));
+    testChar = base + zeroWidthJoinerCharacter;
+    EXPECT_FALSE(Character::treatAsZeroWidthSpace(testChar));
+
+    testChar = base + 0x12;
+    EXPECT_FALSE(Character::treatAsZeroWidthSpaceInComplexScript(testChar));
+    EXPECT_FALSE(Character::treatAsZeroWidthSpaceInComplexScript(testChar));
+    testChar = base + objectReplacementCharacter;
+    EXPECT_FALSE(Character::treatAsZeroWidthSpaceInComplexScript(testChar));
+
+    testChar = base + 0xA;
+    EXPECT_FALSE(Character::isNormalizedCanvasSpaceCharacter(testChar));
+    testChar = base + 0x9;
+    EXPECT_FALSE(Character::isNormalizedCanvasSpaceCharacter(testChar));
+
+}
+
 } // namespace blink