Add String.repeat, String.padLeft, String.padRight.

tests/corelib/string_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
 
-class StringTest {
-
-  static testMain() {
-    testOutOfRange();
-    testIllegalArgument();
-    testConcat();
-    testIndex();
-    testCodeUnitAt();
-    testEquals();
-    testEndsWith();
-    testStartsWith();
-    testIndexOf();
-    testLastIndexOf();
-    testContains();
-    testReplaceAll();
-    testCompareTo();
-    testCharCodes();
-  }
-
-  static void testLength() {
-    String str = "";
-    for (var i = 0; i < 20; i++) {
-      testStringLength(i, str);
-      str += " ";
+void main() {
+  testOutOfRange();
+  testIllegalArgument();
+  testConcat();
+  testIndex();
+  testCodeUnitAt();
+  testEquals();
+  testEndsWith();
+  testStartsWith();
+  testIndexOf();
+  testLastIndexOf();
+  testContains();
+  testReplaceAll();
+  testCompareTo();
+  testCharCodes();
+  testRepeat();
+  testPadLeft();
+  testPadRight();
+}
+
+void testLength() {
+  String str = "";
+  for (var i = 0; i < 20; i++) {
+    testStringLength(i, str);
+    str += " ";
+  }
+}
+
+void testOutOfRange() {
+  String a = "Hello";
+  bool exception_caught = false;
+  try {
+    var c = a[20];  // Throw exception.
+  } on RangeError catch (e) {
+    exception_caught = true;
+  }
+  Expect.isTrue(exception_caught);
+}
+
+void testIllegalArgument() {
+  String a = "Hello";
+  bool exception_caught = false;
+  try {
+    var c = a[2.2];  // Throw exception.
+    Expect.fail("Accepting double as index");
+  } on ArgumentError catch (e) {
+    exception_caught = true;
+  } on TypeError catch (e) {  // Thrown in checked mode only.
+    exception_caught = true;
+  }
+  Expect.isTrue(exception_caught);
+}
+
+void testIndex() {
+  String str = "string";
+  for (int i = 0; i < str.length; i++) {
+    Expect.isTrue(str[i] is String);
+    testStringLength(1, str[i]);
+  }
+}
+
+void testCodeUnitAt() {
+  String str = "string";
+  for (int i = 0; i < str.length; i++) {
+    Expect.isTrue(str.codeUnitAt(i) is int);
+  }
+}
+
+void testConcat() {
+  var a = "One";
+  var b = "Four";
+  var c = a + b;
+  testStringLength(7, c);
+  Expect.equals("OneFour", c);
+}
+
+void testEquals() {
+  Expect.equals("str", "str");
+
+  Expect.equals("str", "s" + "t" + "r");
+  Expect.equals("s" + "t" + "r", "str");
+
+  Expect.isFalse("str" == "s");
+  Expect.isFalse("str" == "r");
+  Expect.isFalse("str" == "st");
+  Expect.isFalse("str" == "tr");
+
+  Expect.isFalse("s" == "str");
+  Expect.isFalse("r" == "str");
+  Expect.isFalse("st" == "str");
+  Expect.isFalse("tr" == "str");
+
+  Expect.isFalse("" == "s");
+  Expect.equals("", "");
+}
+
+void testEndsWith() {
+  Expect.isTrue("str".endsWith("r"));
+  Expect.isTrue("str".endsWith("tr"));
+  Expect.isTrue("str".endsWith("str"));
+
+  Expect.isFalse("str".endsWith("stri"));
+  Expect.isFalse("str".endsWith("t"));
+  Expect.isFalse("str".endsWith("st"));
+  Expect.isFalse("str".endsWith("s"));
+
+  Expect.isTrue("".endsWith(""));
+  Expect.isFalse("".endsWith("s"));
+}
+
+void testStartsWith() {
+  Expect.isTrue("str".startsWith("s"));
+  Expect.isTrue("str".startsWith("st"));
+  Expect.isTrue("str".startsWith("str"));
+
+  Expect.isFalse("str".startsWith("stri"));
+  Expect.isFalse("str".startsWith("r"));
+  Expect.isFalse("str".startsWith("tr"));
+  Expect.isFalse("str".startsWith("t"));
+
+  Expect.isTrue("".startsWith(""));
+  Expect.isFalse("".startsWith("s"));
+
+  Expect.isFalse("strstr".startsWith("s", 1));
+  Expect.isFalse("strstr".startsWith("s", 2));
+  Expect.isTrue("strstr".startsWith("s", 3));
+  Expect.isFalse("strstr".startsWith("s", 4));
+
+  Expect.isFalse("strstr".startsWith("st", 1));
+  Expect.isFalse("strstr".startsWith("st", 2));
+  Expect.isTrue("strstr".startsWith("st", 3));
+  Expect.isFalse("strstr".startsWith("st", 4));
+
+  Expect.isFalse("strstr".startsWith("str", 1));
+  Expect.isFalse("strstr".startsWith("str", 2));
+  Expect.isTrue("strstr".startsWith("str", 3));
+  Expect.isFalse("strstr".startsWith("str", 4));
+
+  Expect.isTrue("str".startsWith("", 0));
+  Expect.isTrue("str".startsWith("", 1));
+  Expect.isTrue("str".startsWith("", 2));
+  Expect.isTrue("str".startsWith("", 3));
+
+  Expect.throws(() => "str".startsWith("", -1));
+  Expect.throws(() => "str".startsWith("", 4));
+
+  var regexp = new RegExp("s(?:tr?)?");
+  Expect.isTrue("s".startsWith(regexp));
+  Expect.isTrue("st".startsWith(regexp));
+  Expect.isTrue("str".startsWith(regexp));
+  Expect.isTrue("sX".startsWith(regexp));
+  Expect.isTrue("stX".startsWith(regexp));
+  Expect.isTrue("strX".startsWith(regexp));
+
+  Expect.isFalse("".startsWith(regexp));
+  Expect.isFalse("astr".startsWith(regexp));
+
+  Expect.isTrue("".startsWith(new RegExp("")));
+  Expect.isTrue("".startsWith(new RegExp("a?")));
+
+  Expect.isFalse("strstr".startsWith(regexp, 1));
+  Expect.isFalse("strstr".startsWith(regexp, 2));
+  Expect.isTrue("strstr".startsWith(regexp, 3));
+  Expect.isFalse("strstr".startsWith(regexp, 4));
+
+  Expect.isTrue("str".startsWith(new RegExp(""), 0));
+  Expect.isTrue("str".startsWith(new RegExp(""), 1));
+  Expect.isTrue("str".startsWith(new RegExp(""), 2));
+  Expect.isTrue("str".startsWith(new RegExp(""), 3));
+  Expect.isTrue("str".startsWith(new RegExp("a?"), 0));
+  Expect.isTrue("str".startsWith(new RegExp("a?"), 1));
+  Expect.isTrue("str".startsWith(new RegExp("a?"), 2));
+  Expect.isTrue("str".startsWith(new RegExp("a?"), 3));
+
+  Expect.throws(() => "str".startsWith(regexp, -1));
+  Expect.throws(() => "str".startsWith(regexp, 4));
+
+  regexp = new RegExp("^str");
+  Expect.isTrue("strstr".startsWith(regexp));
+  Expect.isTrue("strstr".startsWith(regexp, 0));
+  Expect.isFalse("strstr".startsWith(regexp, 1));
+  Expect.isFalse("strstr".startsWith(regexp, 2));
+  Expect.isFalse("strstr".startsWith(regexp, 3));  // Second "str" isn't at ^.
+}
+
+void testIndexOf() {
+  Expect.equals(0, "str".indexOf("", 0));
+  Expect.equals(0, "".indexOf("", 0));
+  Expect.equals(-1, "".indexOf("a", 0));
+
+  Expect.equals(1, "str".indexOf("t", 0));
+  Expect.equals(1, "str".indexOf("tr", 0));
+  Expect.equals(0, "str".indexOf("str", 0));
+  Expect.equals(0, "str".indexOf("st", 0));
+  Expect.equals(0, "str".indexOf("s", 0));
+  Expect.equals(2, "str".indexOf("r", 0));
+  Expect.equals(-1, "str".indexOf("string", 0));
+
+  Expect.equals(1, "strstr".indexOf("t", 0));
+  Expect.equals(1, "strstr".indexOf("tr", 0));
+  Expect.equals(0, "strstr".indexOf("str", 0));
+  Expect.equals(0, "strstr".indexOf("st", 0));
+  Expect.equals(0, "strstr".indexOf("s", 0));
+  Expect.equals(2, "strstr".indexOf("r", 0));
+  Expect.equals(-1, "str".indexOf("string", 0));
+
+  Expect.equals(4, "strstr".indexOf("t", 2));
+  Expect.equals(4, "strstr".indexOf("tr", 2));
+  Expect.equals(3, "strstr".indexOf("str", 1));
+  Expect.equals(3, "strstr".indexOf("str", 2));
+  Expect.equals(3, "strstr".indexOf("str", 3));
+  Expect.equals(3, "strstr".indexOf("st", 1));
+  Expect.equals(3, "strstr".indexOf("s", 3));
+  Expect.equals(5, "strstr".indexOf("r", 3));
+  Expect.equals(5, "strstr".indexOf("r", 4));
+  Expect.equals(5, "strstr".indexOf("r", 5));
+
+  String str = "hello";
+  for (int i = 0; i < 10; i++) {
+    if (i > str.length) {
+      Expect.throws(() => str.indexOf("", i));
+    } else {
+      int result = str.indexOf("", i);
+      Expect.equals(i, result);
     }
   }
 
-  static void testOutOfRange() {
-    String a = "Hello";
-    bool exception_caught = false;
-    try {
-      var c = a[20];  // Throw exception.
-    } on RangeError catch (e) {
-      exception_caught = true;
+  var re = new RegExp("an?");
+  Expect.equals(1, "banana".indexOf(re));
+  Expect.equals(1, "banana".indexOf(re, 0));
+  Expect.equals(1, "banana".indexOf(re, 1));
+  Expect.equals(3, "banana".indexOf(re, 2));
+  Expect.equals(3, "banana".indexOf(re, 3));
+  Expect.equals(5, "banana".indexOf(re, 4));
+  Expect.equals(5, "banana".indexOf(re, 5));
+  Expect.equals(-1, "banana".indexOf(re, 6));
+  Expect.throws(() => "banana".indexOf(re, -1));
+  Expect.throws(() => "banana".indexOf(re, 7));
+  re = new RegExp("x?");
+  for (int i = 0; i <= str.length; i++) {
+    Expect.equals(i, str.indexOf(re, i));
+  }
+}
+
+void testLastIndexOf() {
+  Expect.equals(2, "str".lastIndexOf("", 2));
+  Expect.equals(0, "".lastIndexOf("", 0));
+  Expect.equals(-1, "".lastIndexOf("a", 0));
+
+  Expect.equals(1, "str".lastIndexOf("t", 2));
+  Expect.equals(1, "str".lastIndexOf("tr", 2));
+  Expect.equals(0, "str".lastIndexOf("str", 2));
+  Expect.equals(0, "str".lastIndexOf("st", 2));
+  Expect.equals(0, "str".lastIndexOf("s", 2));
+  Expect.equals(2, "str".lastIndexOf("r", 2));
+  Expect.equals(-1, "str".lastIndexOf("string", 2));
+
+  Expect.equals(4, "strstr".lastIndexOf("t", 5));
+  Expect.equals(4, "strstr".lastIndexOf("tr", 5));
+  Expect.equals(3, "strstr".lastIndexOf("str", 5));
+  Expect.equals(3, "strstr".lastIndexOf("st", 5));
+  Expect.equals(3, "strstr".lastIndexOf("s", 5));
+  Expect.equals(5, "strstr".lastIndexOf("r", 5));
+  Expect.throws(() {
+      "str".lastIndexOf("string", 5);
+  });
+  Expect.equals(4, "strstr".lastIndexOf("t", 5));
+  Expect.equals(4, "strstr".lastIndexOf("tr", 5));
+  Expect.equals(3, "strstr".lastIndexOf("str", 5));
+  Expect.equals(3, "strstr".lastIndexOf("str", 5));
+  Expect.equals(3, "strstr".lastIndexOf("str", 5));
+  Expect.equals(3, "strstr".lastIndexOf("st", 5));
+  Expect.equals(3, "strstr".lastIndexOf("s", 5));
+  Expect.equals(5, "strstr".lastIndexOf("r", 5));
+  Expect.equals(2, "strstr".lastIndexOf("r", 4));
+  Expect.equals(2, "strstr".lastIndexOf("r", 3));
+  Expect.equals(5, "strstr".lastIndexOf("r"));
+  Expect.equals(5, "strstr".lastIndexOf("r", null));
+
+  String str = "hello";
+  for (int i = 0; i < 10; i++) {
+    if (i > str.length) {
+      Expect.throws(() => str.indexOf("", i));
+    } else {
+      int result = str.lastIndexOf("", i);
+      Expect.equals(i, result);
     }
-    Expect.isTrue(exception_caught);
-  }
-
-  static testIllegalArgument() {
-    String a = "Hello";
-    bool exception_caught = false;
-    try {
-      var c = a[2.2];  // Throw exception.
-      Expect.fail("Accepting double as index");
-    } on ArgumentError catch (e) {
-      exception_caught = true;
-    } on TypeError catch (e) {  // Thrown in checked mode only.
-      exception_caught = true;
+  }
+
+  var re = new RegExp("an?");
+  Expect.equals(5, "banana".lastIndexOf(re));
+  Expect.equals(5, "banana".lastIndexOf(re, 6));
+  Expect.equals(5, "banana".lastIndexOf(re, 5));
+  Expect.equals(3, "banana".lastIndexOf(re, 4));
+  Expect.equals(3, "banana".lastIndexOf(re, 3));
+  Expect.equals(1, "banana".lastIndexOf(re, 2));
+  Expect.equals(1, "banana".lastIndexOf(re, 1));
+  Expect.equals(-1, "banana".lastIndexOf(re, 0));
+  Expect.throws(() => "banana".lastIndexOf(re, -1));
+  Expect.throws(() => "banana".lastIndexOf(re, 7));
+  re = new RegExp("x?");
+  for (int i = 0; i <= str.length; i++) {
+    Expect.equals(i, str.indexOf(re, i));
+  }
+}
+
+void testContains() {
+  Expect.isTrue("str".contains("s", 0));
+  Expect.isTrue("str".contains("st", 0));
+  Expect.isTrue("str".contains("str", 0));
+  Expect.isTrue("str".contains("t", 0));
+  Expect.isTrue("str".contains("r", 0));
+  Expect.isTrue("str".contains("tr", 0));
+
+  Expect.isFalse("str".contains("sr", 0));
+  Expect.isFalse("str".contains("string", 0));
+
+  Expect.isTrue("str".contains("", 0));
+  Expect.isTrue("".contains("", 0));
+  Expect.isFalse("".contains("s", 0));
+}
+
+void testReplaceAll() {
+  Expect.equals(
+      "AtoBtoCDtoE", "AfromBfromCDfromE".replaceAll("from", "to"));
+
+  // Test with the replaced string at the begining.
+  Expect.equals(
+      "toABtoCDtoE", "fromABfromCDfromE".replaceAll("from", "to"));
+
+  // Test with the replaced string at the end.
+  Expect.equals(
+      "toABtoCDtoEto", "fromABfromCDfromEfrom".replaceAll("from", "to"));
+
+  // Test when there are no occurence of the string to replace.
+  Expect.equals("ABC", "ABC".replaceAll("from", "to"));
+
+  // Test when the string to change is the empty string.
+  Expect.equals("", "".replaceAll("from", "to"));
+
+  // Test when the string to change is a substring of the string to
+  // replace.
+  Expect.equals("fro", "fro".replaceAll("from", "to"));
+
+  // Test when the string to change is the replaced string.
+  Expect.equals("to", "from".replaceAll("from", "to"));
+
+  // Test when the string to change is the replacement string.
+  Expect.equals("to", "to".replaceAll("from", "to"));
+
+  // Test replacing by the empty string.
+  Expect.equals("", "from".replaceAll("from", ""));
+  Expect.equals("AB", "AfromB".replaceAll("from", ""));
+
+  // Test changing the empty string.
+  Expect.equals("to", "".replaceAll("", "to"));
+
+  // Test replacing the empty string.
+  Expect.equals("toAtoBtoCto", "ABC".replaceAll("", "to"));
+}
+
+void testCompareTo() {
+  Expect.equals(0, "".compareTo(""));
+  Expect.equals(0, "str".compareTo("str"));
+  Expect.equals(-1, "str".compareTo("string"));
+  Expect.equals(1, "string".compareTo("str"));
+  Expect.equals(1, "string".compareTo(""));
+  Expect.equals(-1, "".compareTo("string"));
+}
+
+void testCharCodes() {
+  test(str) {
+    var list = str.codeUnits;
+    Expect.equals(str.length, list.length);
+    for (int i = 0; i < str.length; i++) {
+      Expect.equals(str.codeUnitAt(i), list[i]);
     }
-    Expect.isTrue(exception_caught);
-  }
-
-  static testIndex() {
-    String str = "string";
-    for (int i = 0; i < str.length; i++) {
-      Expect.isTrue(str[i] is String);
-      testStringLength(1, str[i]);
-    }
-  }
-
-  static testCodeUnitAt() {
-    String str = "string";
-    for (int i = 0; i < str.length; i++) {
-      Expect.isTrue(str.codeUnitAt(i) is int);
-    }
-  }
-
-  static testConcat() {
-    var a = "One";
-    var b = "Four";
-    var c = a + b;
-    testStringLength(7, c);
-    Expect.equals("OneFour", c);
-  }
-
-  static testEquals() {
-    Expect.equals("str", "str");
-
-    Expect.equals("str", "s" + "t" + "r");
-    Expect.equals("s" + "t" + "r", "str");
-
-    Expect.isFalse("str" == "s");
-    Expect.isFalse("str" == "r");
-    Expect.isFalse("str" == "st");
-    Expect.isFalse("str" == "tr");
-
-    Expect.isFalse("s" == "str");
-    Expect.isFalse("r" == "str");
-    Expect.isFalse("st" == "str");
-    Expect.isFalse("tr" == "str");
-
-    Expect.isFalse("" == "s");
-    Expect.equals("", "");
-  }
-
-  static testEndsWith() {
-    Expect.isTrue("str".endsWith("r"));
-    Expect.isTrue("str".endsWith("tr"));
-    Expect.isTrue("str".endsWith("str"));
-
-    Expect.isFalse("str".endsWith("stri"));
-    Expect.isFalse("str".endsWith("t"));
-    Expect.isFalse("str".endsWith("st"));
-    Expect.isFalse("str".endsWith("s"));
-
-    Expect.isTrue("".endsWith(""));
-    Expect.isFalse("".endsWith("s"));
-  }
-
-  static testStartsWith() {
-    Expect.isTrue("str".startsWith("s"));
-    Expect.isTrue("str".startsWith("st"));
-    Expect.isTrue("str".startsWith("str"));
-
-    Expect.isFalse("str".startsWith("stri"));
-    Expect.isFalse("str".startsWith("r"));
-    Expect.isFalse("str".startsWith("tr"));
-    Expect.isFalse("str".startsWith("t"));
-
-    Expect.isTrue("".startsWith(""));
-    Expect.isFalse("".startsWith("s"));
-
-    Expect.isFalse("strstr".startsWith("s", 1));
-    Expect.isFalse("strstr".startsWith("s", 2));
-    Expect.isTrue("strstr".startsWith("s", 3));
-    Expect.isFalse("strstr".startsWith("s", 4));
-
-    Expect.isFalse("strstr".startsWith("st", 1));
-    Expect.isFalse("strstr".startsWith("st", 2));
-    Expect.isTrue("strstr".startsWith("st", 3));
-    Expect.isFalse("strstr".startsWith("st", 4));
-
-    Expect.isFalse("strstr".startsWith("str", 1));
-    Expect.isFalse("strstr".startsWith("str", 2));
-    Expect.isTrue("strstr".startsWith("str", 3));
-    Expect.isFalse("strstr".startsWith("str", 4));
-
-    Expect.isTrue("str".startsWith("", 0));
-    Expect.isTrue("str".startsWith("", 1));
-    Expect.isTrue("str".startsWith("", 2));
-    Expect.isTrue("str".startsWith("", 3));
-
-    Expect.throws(() => "str".startsWith("", -1));
-    Expect.throws(() => "str".startsWith("", 4));
-
-    var regexp = new RegExp("s(?:tr?)?");
-    Expect.isTrue("s".startsWith(regexp));
-    Expect.isTrue("st".startsWith(regexp));
-    Expect.isTrue("str".startsWith(regexp));
-    Expect.isTrue("sX".startsWith(regexp));
-    Expect.isTrue("stX".startsWith(regexp));
-    Expect.isTrue("strX".startsWith(regexp));
-
-    Expect.isFalse("".startsWith(regexp));
-    Expect.isFalse("astr".startsWith(regexp));
-
-    Expect.isTrue("".startsWith(new RegExp("")));
-    Expect.isTrue("".startsWith(new RegExp("a?")));
-
-    Expect.isFalse("strstr".startsWith(regexp, 1));
-    Expect.isFalse("strstr".startsWith(regexp, 2));
-    Expect.isTrue("strstr".startsWith(regexp, 3));
-    Expect.isFalse("strstr".startsWith(regexp, 4));
-
-    Expect.isTrue("str".startsWith(new RegExp(""), 0));
-    Expect.isTrue("str".startsWith(new RegExp(""), 1));
-    Expect.isTrue("str".startsWith(new RegExp(""), 2));
-    Expect.isTrue("str".startsWith(new RegExp(""), 3));
-    Expect.isTrue("str".startsWith(new RegExp("a?"), 0));
-    Expect.isTrue("str".startsWith(new RegExp("a?"), 1));
-    Expect.isTrue("str".startsWith(new RegExp("a?"), 2));
-    Expect.isTrue("str".startsWith(new RegExp("a?"), 3));
-
-    Expect.throws(() => "str".startsWith(regexp, -1));
-    Expect.throws(() => "str".startsWith(regexp, 4));
-
-    regexp = new RegExp("^str");
-    Expect.isTrue("strstr".startsWith(regexp));
-    Expect.isTrue("strstr".startsWith(regexp, 0));
-    Expect.isFalse("strstr".startsWith(regexp, 1));
-    Expect.isFalse("strstr".startsWith(regexp, 2));
-    Expect.isFalse("strstr".startsWith(regexp, 3));  // Second "str" isn't at ^.
-  }
-
-  static testIndexOf() {
-    Expect.equals(0, "str".indexOf("", 0));
-    Expect.equals(0, "".indexOf("", 0));
-    Expect.equals(-1, "".indexOf("a", 0));
-
-    Expect.equals(1, "str".indexOf("t", 0));
-    Expect.equals(1, "str".indexOf("tr", 0));
-    Expect.equals(0, "str".indexOf("str", 0));
-    Expect.equals(0, "str".indexOf("st", 0));
-    Expect.equals(0, "str".indexOf("s", 0));
-    Expect.equals(2, "str".indexOf("r", 0));
-    Expect.equals(-1, "str".indexOf("string", 0));
-
-    Expect.equals(1, "strstr".indexOf("t", 0));
-    Expect.equals(1, "strstr".indexOf("tr", 0));
-    Expect.equals(0, "strstr".indexOf("str", 0));
-    Expect.equals(0, "strstr".indexOf("st", 0));
-    Expect.equals(0, "strstr".indexOf("s", 0));
-    Expect.equals(2, "strstr".indexOf("r", 0));
-    Expect.equals(-1, "str".indexOf("string", 0));
-
-    Expect.equals(4, "strstr".indexOf("t", 2));
-    Expect.equals(4, "strstr".indexOf("tr", 2));
-    Expect.equals(3, "strstr".indexOf("str", 1));
-    Expect.equals(3, "strstr".indexOf("str", 2));
-    Expect.equals(3, "strstr".indexOf("str", 3));
-    Expect.equals(3, "strstr".indexOf("st", 1));
-    Expect.equals(3, "strstr".indexOf("s", 3));
-    Expect.equals(5, "strstr".indexOf("r", 3));
-    Expect.equals(5, "strstr".indexOf("r", 4));
-    Expect.equals(5, "strstr".indexOf("r", 5));
-
-    String str = "hello";
-    for (int i = 0; i < 10; i++) {
-      if (i > str.length) {
-        Expect.throws(() => str.indexOf("", i));
-      } else {
-        int result = str.indexOf("", i);
-        Expect.equals(i, result);
-      }
-    }
-
-    var re = new RegExp("an?");
-    Expect.equals(1, "banana".indexOf(re));
-    Expect.equals(1, "banana".indexOf(re, 0));
-    Expect.equals(1, "banana".indexOf(re, 1));
-    Expect.equals(3, "banana".indexOf(re, 2));
-    Expect.equals(3, "banana".indexOf(re, 3));
-    Expect.equals(5, "banana".indexOf(re, 4));
-    Expect.equals(5, "banana".indexOf(re, 5));
-    Expect.equals(-1, "banana".indexOf(re, 6));
-    Expect.throws(() => "banana".indexOf(re, -1));
-    Expect.throws(() => "banana".indexOf(re, 7));
-    re = new RegExp("x?");
-    for (int i = 0; i <= str.length; i++) {
-      Expect.equals(i, str.indexOf(re, i));
-    }
-  }
-
-  static testLastIndexOf() {
-    Expect.equals(2, "str".lastIndexOf("", 2));
-    Expect.equals(0, "".lastIndexOf("", 0));
-    Expect.equals(-1, "".lastIndexOf("a", 0));
-
-    Expect.equals(1, "str".lastIndexOf("t", 2));
-    Expect.equals(1, "str".lastIndexOf("tr", 2));
-    Expect.equals(0, "str".lastIndexOf("str", 2));
-    Expect.equals(0, "str".lastIndexOf("st", 2));
-    Expect.equals(0, "str".lastIndexOf("s", 2));
-    Expect.equals(2, "str".lastIndexOf("r", 2));
-    Expect.equals(-1, "str".lastIndexOf("string", 2));
-
-    Expect.equals(4, "strstr".lastIndexOf("t", 5));
-    Expect.equals(4, "strstr".lastIndexOf("tr", 5));
-    Expect.equals(3, "strstr".lastIndexOf("str", 5));
-    Expect.equals(3, "strstr".lastIndexOf("st", 5));
-    Expect.equals(3, "strstr".lastIndexOf("s", 5));
-    Expect.equals(5, "strstr".lastIndexOf("r", 5));
-    Expect.throws(() {
-        "str".lastIndexOf("string", 5);
-    });
-    Expect.equals(4, "strstr".lastIndexOf("t", 5));
-    Expect.equals(4, "strstr".lastIndexOf("tr", 5));
-    Expect.equals(3, "strstr".lastIndexOf("str", 5));
-    Expect.equals(3, "strstr".lastIndexOf("str", 5));
-    Expect.equals(3, "strstr".lastIndexOf("str", 5));
-    Expect.equals(3, "strstr".lastIndexOf("st", 5));
-    Expect.equals(3, "strstr".lastIndexOf("s", 5));
-    Expect.equals(5, "strstr".lastIndexOf("r", 5));
-    Expect.equals(2, "strstr".lastIndexOf("r", 4));
-    Expect.equals(2, "strstr".lastIndexOf("r", 3));
-    Expect.equals(5, "strstr".lastIndexOf("r"));
-    Expect.equals(5, "strstr".lastIndexOf("r", null));
-
-    String str = "hello";
-    for (int i = 0; i < 10; i++) {
-      if (i > str.length) {
-        Expect.throws(() => str.indexOf("", i));
-      } else {
-        int result = str.lastIndexOf("", i);
-        Expect.equals(i, result);
-      }
-    }
-
-    var re = new RegExp("an?");
-    Expect.equals(5, "banana".lastIndexOf(re));
-    Expect.equals(5, "banana".lastIndexOf(re, 6));
-    Expect.equals(5, "banana".lastIndexOf(re, 5));
-    Expect.equals(3, "banana".lastIndexOf(re, 4));
-    Expect.equals(3, "banana".lastIndexOf(re, 3));
-    Expect.equals(1, "banana".lastIndexOf(re, 2));
-    Expect.equals(1, "banana".lastIndexOf(re, 1));
-    Expect.equals(-1, "banana".lastIndexOf(re, 0));
-    Expect.throws(() => "banana".lastIndexOf(re, -1));
-    Expect.throws(() => "banana".lastIndexOf(re, 7));
-    re = new RegExp("x?");
-    for (int i = 0; i <= str.length; i++) {
-      Expect.equals(i, str.indexOf(re, i));
-    }
-  }
-
-  static testContains() {
-    Expect.isTrue("str".contains("s", 0));
-    Expect.isTrue("str".contains("st", 0));
-    Expect.isTrue("str".contains("str", 0));
-    Expect.isTrue("str".contains("t", 0));
-    Expect.isTrue("str".contains("r", 0));
-    Expect.isTrue("str".contains("tr", 0));
-
-    Expect.isFalse("str".contains("sr", 0));
-    Expect.isFalse("str".contains("string", 0));
-
-    Expect.isTrue("str".contains("", 0));
-    Expect.isTrue("".contains("", 0));
-    Expect.isFalse("".contains("s", 0));
-  }
-
-  static testReplaceAll() {
-    Expect.equals(
-        "AtoBtoCDtoE", "AfromBfromCDfromE".replaceAll("from", "to"));
-
-    // Test with the replaced string at the begining.
-    Expect.equals(
-        "toABtoCDtoE", "fromABfromCDfromE".replaceAll("from", "to"));
-
-    // Test with the replaced string at the end.
-    Expect.equals(
-        "toABtoCDtoEto", "fromABfromCDfromEfrom".replaceAll("from", "to"));
-
-    // Test when there are no occurence of the string to replace.
-    Expect.equals("ABC", "ABC".replaceAll("from", "to"));
-
-    // Test when the string to change is the empty string.
-    Expect.equals("", "".replaceAll("from", "to"));
-
-    // Test when the string to change is a substring of the string to
-    // replace.
-    Expect.equals("fro", "fro".replaceAll("from", "to"));
-
-    // Test when the string to change is the replaced string.
-    Expect.equals("to", "from".replaceAll("from", "to"));
-
-    // Test when the string to change is the replacement string.
-    Expect.equals("to", "to".replaceAll("from", "to"));
-
-    // Test replacing by the empty string.
-    Expect.equals("", "from".replaceAll("from", ""));
-    Expect.equals("AB", "AfromB".replaceAll("from", ""));
-
-    // Test changing the empty string.
-    Expect.equals("to", "".replaceAll("", "to"));
-
-    // Test replacing the empty string.
-    Expect.equals("toAtoBtoCto", "ABC".replaceAll("", "to"));
-  }
-
-  static testCompareTo() {
-    Expect.equals(0, "".compareTo(""));
-    Expect.equals(0, "str".compareTo("str"));
-    Expect.equals(-1, "str".compareTo("string"));
-    Expect.equals(1, "string".compareTo("str"));
-    Expect.equals(1, "string".compareTo(""));
-    Expect.equals(-1, "".compareTo("string"));
-  }
-
-  static testCharCodes() {
-    test(str) {
-      var list = str.codeUnits;
-      Expect.equals(str.length, list.length);
-      for (int i = 0; i < str.length; i++) {
-        Expect.equals(str.codeUnitAt(i), list[i]);
-      }
-    }
-    test("abc");
-    test("");
-    test(" ");
-  }
+  }
+  test("abc");
+  test("");
+  test(" ");
 }
 
 void testStringLength(int length, String str) {
   Expect.equals(length, str.length);
   (length == 0 ? Expect.isTrue : Expect.isFalse)(str.isEmpty);
   (length != 0 ? Expect.isTrue : Expect.isFalse)(str.isNotEmpty);
 }
 
-main() {
-  StringTest.testMain();
+void testRepeat() {
+  List<String> testStrings = [
+    "",
+    "\x00",
+    "a",
+    "ab",
+    "\x80",
+    "\xff",
+    "\u2028",
+    "abcdef\u2028",
+    "\u{10002}",
+    "abcdef\u{10002}"
+  ];
+  List<int> counts = [
+    0,
+    1,
+    2,
+    3,
+    10,
+    100
+  ];
+  void testRepeat(str, repeat, sep) {
+    String expect;
+    if (repeat == 0) {
+      expect = "";
+    } else if (repeat == 1) {
+      expect = str;
+    } else {
+      StringBuffer buf = new StringBuffer(str);
+      for (int i = 1; i < repeat; i++) {
+        buf.write(sep);
+        buf.write(str);
+      }
+      expect = buf.toString();
+    }
+    String actual = str.repeat(repeat, sep);
+    Expect.equals(expect, actual,
+                  "$str#${str.length}*$repeat/$sep#${sep.length}");
+  }
+  for (String str in testStrings) {
+    for (String sep in testStrings) {
+      for (int repeat in counts) {
+        testRepeat(str, repeat, sep);
+      }
+    }
+  }
+  Expect.throws(() { "a".repeat(-1); });
 }
+
+void testPadLeft() {
+  Expect.equals("    1", "1".padLeft(5, ' '));
+  Expect.equals("   11", "11".padLeft(5, ' '));
+  Expect.equals("  111", "111".padLeft(5, ' '));
+  Expect.equals(" 1111", "1111".padLeft(5, ' '));
+  Expect.equals("11111", "11111".padLeft(5, ' '));
+  Expect.equals("111111", "111111".padLeft(5, ' '));
+  Expect.equals("   \u{10002}", "\u{10002}".padLeft(5, ' '));
+  Expect.equals('', ''.padLeft(0, 'a'));
+  Expect.equals('a', ''.padLeft(1, 'a'));
+  Expect.equals('aaaaa', ''.padLeft(5, 'a'));
+  Expect.equals('', ''.padLeft(-2, 'a'));
+
+  Expect.throws(() { ' '.padLeft(5, ''); });
+  Expect.throws(() { ' '.padLeft(5, 'xx'); });
+  Expect.throws(() { ' '.padLeft(5, '\u{10002}'); });
+}
+
+void testPadRight() {
+  Expect.equals("1    ", "1".padRight(5, ' '));
+  Expect.equals("11   ", "11".padRight(5, ' '));
+  Expect.equals("111  ", "111".padRight(5, ' '));
+  Expect.equals("1111 ", "1111".padRight(5, ' '));
+  Expect.equals("11111", "11111".padRight(5, ' '));
+  Expect.equals("111111", "111111".padRight(5, ' '));
+  Expect.equals("\u{10002}   ", "\u{10002}".padRight(5, ' '));
+  Expect.equals('', ''.padRight(0, 'a'));
+  Expect.equals('a', ''.padRight(1, 'a'));
+  Expect.equals('aaaaa', ''.padRight(5, 'a'));
+  Expect.equals('', ''.padRight(-2, 'a'));
+
+  Expect.throws(() { ' '.padRight(5, ''); });
+  Expect.throws(() { ' '.padRight(5, 'xx'); });
+  Expect.throws(() { ' '.padRight(5, '\u{10002}'); });
+}