Optimize one-byte string's toUpperCase.

tests/corelib/string_case_test.dart

Index: tests/corelib/string_case_test.dart
diff --git a/tests/corelib/string_case_test.dart b/tests/corelib/string_case_test.dart
index 6ba535ca10ad68d525fac426c9d6fcf096ff6a3a..d6c140d054b3f9fb9351577ac91d628bbb1da2c3 100644
--- a/tests/corelib/string_case_test.dart
+++ b/tests/corelib/string_case_test.dart
@@ -4,21 +4,52 @@
 
 import "package:expect/expect.dart";
 
-class StringCaseTest {
-
-  static testMain() {
-    testLowerUpper();
-  }
+main() {
+  testLowerUpper();
+  testSpecialCases();
+}
 
-  static testLowerUpper() {
-    var a = "Stop! Smell the Roses.";
-    var allLower = "stop! smell the roses.";
-    var allUpper = "STOP! SMELL THE ROSES.";
-    Expect.equals(allUpper, a.toUpperCase());
-    Expect.equals(allLower, a.toLowerCase());
-  }
+void testLowerUpper() {
+  var a = "Stop! Smell the Roses.";
+  var allLower = "stop! smell the roses.";
+  var allUpper = "STOP! SMELL THE ROSES.";
+  Expect.equals(allUpper, a.toUpperCase());
+  Expect.equals(allLower, a.toLowerCase());
 }
 
-main() {
-  StringCaseTest.testMain();
+void testSpecialCases() {
+  // Letters in Latin-1 where the upper case is not in Latin-1.
+
+  // German sharp s. Upper case variant is "SS".
+  Expect.equals("SS", "\xdf".toUpperCase());                  /// 01: ok
+  Expect.equals("\xdf", "\xdf".toLowerCase());
+  Expect.equals("ss", "\xdf".toUpperCase().toLowerCase());    /// 01: continued
+  // Micro sign (not same as lower-case Greek letter mu, U+03BC).
+  Expect.equals("\u039c", "\xb5".toUpperCase());              /// 02: ok
+  Expect.equals("\xb5", "\xb5".toLowerCase());
+  Expect.equals("\u03Bc",                                     /// 02: continued
+                "\xb5".toUpperCase().toLowerCase());          /// 02: continued
+  // Small letter y diaresis.
+  Expect.equals("\u0178", "\xff".toUpperCase());              /// 03: ok
+  Expect.equals("\xff", "\xff".toLowerCase());
+  Expect.equals("\xff", "\xff".toUpperCase().toLowerCase());  /// 03: continued
+  // Zero.
+  Expect.equals("\x00", "\x00".toLowerCase());
+  Expect.equals("\x00", "\x00".toUpperCase());
+
+  // Test all combinations of ordering of lower-case, upper-case and
+  // special-when-upper-cased characters.
+  Expect.equals("AA\u0178", "Aa\xff".toUpperCase());          /// 03: continued
+  Expect.equals("AA\u0178", "aA\xff".toUpperCase());          /// 03: continued
+  Expect.equals("A\u0178A", "A\xffa".toUpperCase());          /// 03: continued
+  Expect.equals("A\u0178A", "a\xffA".toUpperCase());          /// 03: continued
+  Expect.equals("\u0178AA", "\xffAa".toUpperCase());          /// 03: continued
+  Expect.equals("\u0178AA", "\xffaA".toUpperCase());          /// 03: continued
+
+  Expect.equals("aa\xff", "Aa\xff".toLowerCase());
+  Expect.equals("aa\xff", "aA\xff".toLowerCase());
+  Expect.equals("a\xffa", "A\xffa".toLowerCase());
+  Expect.equals("a\xffa", "a\xffA".toLowerCase());
+  Expect.equals("\xffaa", "\xffAa".toLowerCase());
+  Expect.equals("\xffaa", "\xffaA".toLowerCase());
 }