diff --git a/testcases/test-builtin-global-escape.js b/testcases/test-builtin-global-escape.js
new file mode 100644
index 00000000..afe24ac0
--- /dev/null
+++ b/testcases/test-builtin-global-escape.js
@@ -0,0 +1,210 @@
+
+// FIXME: util
+/* Trivial string checksum used to summarize brute force output lines
+ * (minimizes test case size).
+ */
+function checkSumString(x) {
+    var i, n;
+    var res = 0;
+    var mult = [ 1, 3, 5, 7, 11, 13, 17, 19, 23 ];
+
+    n = x.length;
+    for (i = 0; i < n; i++) {
+        res += x.charCodeAt(i) * mult[i % mult.length];
+        res = res >>> 0;  // coerce to 32 bits
+    }
+
+    return res;
+}
+
+// indirect eval -> this is bound to the global object, E5 Section 10.4.2, step 1.a.
+var g = (function () { var e = eval; return e('this'); } )();
+
+/*===
+basic
+%00%01%02%03%04%05%06%07%08%09%0A%0B%0C%0D%0E%0F%10%11%12%13%14%15%16%17%18%19%1A%1B%1C%1D%1E%1F
+%20%21%22%23%24%25%26%27%28%29*+%2C-./0123456789%3A%3B%3C%3D%3E%3F
+@ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5C%5D%5E_
+%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D%7E%7F
+%80%81%82%83%84%85%86%87%88%89%8A%8B%8C%8D%8E%8F%90%91%92%93%94%95%96%97%98%99%9A%9B%9C%9D%9E%9F
+%A0%A1%A2%A3%A4%A5%A6%A7%A8%A9%AA%AB%AC%AD%AE%AF%B0%B1%B2%B3%B4%B5%B6%B7%B8%B9%BA%BB%BC%BD%BE%BF
+%C0%C1%C2%C3%C4%C5%C6%C7%C8%C9%CA%CB%CC%CD%CE%CF%D0%D1%D2%D3%D4%D5%D6%D7%D8%D9%DA%DB%DC%DD%DE%DF
+%E0%E1%E2%E3%E4%E5%E6%E7%E8%E9%EA%EB%EC%ED%EE%EF%F0%F1%F2%F3%F4%F5%F6%F7%F8%F9%FA%FB%FC%FD%FE%FF
+%u0100%u0101%u0102%u0103%u0104%u0105%u0106%u0107%u0108%u0109%u010A%u010B%u010C%u010D%u010E%u010F%u0110%u0111%u0112%u0113%u0114%u0115%u0116%u0117%u0118%u0119%u011A%u011B%u011C%u011D%u011E%u011F
+%u0120%u0121%u0122%u0123%u0124%u0125%u0126%u0127%u0128%u0129%u012A%u012B%u012C%u012D%u012E%u012F%u0130%u0131%u0132%u0133%u0134%u0135%u0136%u0137%u0138%u0139%u013A%u013B%u013C%u013D%u013E%u013F
+%u0140%u0141%u0142%u0143%u0144%u0145%u0146%u0147%u0148%u0149%u014A%u014B%u014C%u014D%u014E%u014F%u0150%u0151%u0152%u0153%u0154%u0155%u0156%u0157%u0158%u0159%u015A%u015B%u015C%u015D%u015E%u015F
+%u0160%u0161%u0162%u0163%u0164%u0165%u0166%u0167%u0168%u0169%u016A%u016B%u016C%u016D%u016E%u016F%u0170%u0171%u0172%u0173%u0174%u0175%u0176%u0177%u0178%u0179%u017A%u017B%u017C%u017D%u017E%u017F
+%u0180%u0181%u0182%u0183%u0184%u0185%u0186%u0187%u0188%u0189%u018A%u018B%u018C%u018D%u018E%u018F%u0190%u0191%u0192%u0193%u0194%u0195%u0196%u0197%u0198%u0199%u019A%u019B%u019C%u019D%u019E%u019F
+%u01A0%u01A1%u01A2%u01A3%u01A4%u01A5%u01A6%u01A7%u01A8%u01A9%u01AA%u01AB%u01AC%u01AD%u01AE%u01AF%u01B0%u01B1%u01B2%u01B3%u01B4%u01B5%u01B6%u01B7%u01B8%u01B9%u01BA%u01BB%u01BC%u01BD%u01BE%u01BF
+%u01C0%u01C1%u01C2%u01C3%u01C4%u01C5%u01C6%u01C7%u01C8%u01C9%u01CA%u01CB%u01CC%u01CD%u01CE%u01CF%u01D0%u01D1%u01D2%u01D3%u01D4%u01D5%u01D6%u01D7%u01D8%u01D9%u01DA%u01DB%u01DC%u01DD%u01DE%u01DF
+%u01E0%u01E1%u01E2%u01E3%u01E4%u01E5%u01E6%u01E7%u01E8%u01E9%u01EA%u01EB%u01EC%u01ED%u01EE%u01EF%u01F0%u01F1%u01F2%u01F3%u01F4%u01F5%u01F6%u01F7%u01F8%u01F9%u01FA%u01FB%u01FC%u01FD%u01FE%u01FF
+%u0200%u0201%u0202%u0203%u0204%u0205%u0206%u0207%u0208%u0209%u020A%u020B%u020C%u020D%u020E%u020F%u0210%u0211%u0212%u0213%u0214%u0215%u0216%u0217%u0218%u0219%u021A%u021B%u021C%u021D%u021E%u021F
+%u0220%u0221%u0222%u0223%u0224%u0225%u0226%u0227%u0228%u0229%u022A%u022B%u022C%u022D%u022E%u022F%u0230%u0231%u0232%u0233%u0234%u0235%u0236%u0237%u0238%u0239%u023A%u023B%u023C%u023D%u023E%u023F
+%u0240%u0241%u0242%u0243%u0244%u0245%u0246%u0247%u0248%u0249%u024A%u024B%u024C%u024D%u024E%u024F%u0250%u0251%u0252%u0253%u0254%u0255%u0256%u0257%u0258%u0259%u025A%u025B%u025C%u025D%u025E%u025F
+%u0260%u0261%u0262%u0263%u0264%u0265%u0266%u0267%u0268%u0269%u026A%u026B%u026C%u026D%u026E%u026F%u0270%u0271%u0272%u0273%u0274%u0275%u0276%u0277%u0278%u0279%u027A%u027B%u027C%u027D%u027E%u027F
+%u0280%u0281%u0282%u0283%u0284%u0285%u0286%u0287%u0288%u0289%u028A%u028B%u028C%u028D%u028E%u028F%u0290%u0291%u0292%u0293%u0294%u0295%u0296%u0297%u0298%u0299%u029A%u029B%u029C%u029D%u029E%u029F
+%u02A0%u02A1%u02A2%u02A3%u02A4%u02A5%u02A6%u02A7%u02A8%u02A9%u02AA%u02AB%u02AC%u02AD%u02AE%u02AF%u02B0%u02B1%u02B2%u02B3%u02B4%u02B5%u02B6%u02B7%u02B8%u02B9%u02BA%u02BB%u02BC%u02BD%u02BE%u02BF
+%u02C0%u02C1%u02C2%u02C3%u02C4%u02C5%u02C6%u02C7%u02C8%u02C9%u02CA%u02CB%u02CC%u02CD%u02CE%u02CF%u02D0%u02D1%u02D2%u02D3%u02D4%u02D5%u02D6%u02D7%u02D8%u02D9%u02DA%u02DB%u02DC%u02DD%u02DE%u02DF
+%u02E0%u02E1%u02E2%u02E3%u02E4%u02E5%u02E6%u02E7%u02E8%u02E9%u02EA%u02EB%u02EC%u02ED%u02EE%u02EF%u02F0%u02F1%u02F2%u02F3%u02F4%u02F5%u02F6%u02F7%u02F8%u02F9%u02FA%u02FB%u02FC%u02FD%u02FE%u02FF
+%u0300%u0301%u0302%u0303%u0304%u0305%u0306%u0307%u0308%u0309%u030A%u030B%u030C%u030D%u030E%u030F%u0310%u0311%u0312%u0313%u0314%u0315%u0316%u0317%u0318%u0319%u031A%u031B%u031C%u031D%u031E%u031F
+%u0320%u0321%u0322%u0323%u0324%u0325%u0326%u0327%u0328%u0329%u032A%u032B%u032C%u032D%u032E%u032F%u0330%u0331%u0332%u0333%u0334%u0335%u0336%u0337%u0338%u0339%u033A%u033B%u033C%u033D%u033E%u033F
+%u0340%u0341%u0342%u0343%u0344%u0345%u0346%u0347%u0348%u0349%u034A%u034B%u034C%u034D%u034E%u034F%u0350%u0351%u0352%u0353%u0354%u0355%u0356%u0357%u0358%u0359%u035A%u035B%u035C%u035D%u035E%u035F
+%u0360%u0361%u0362%u0363%u0364%u0365%u0366%u0367%u0368%u0369%u036A%u036B%u036C%u036D%u036E%u036F%u0370%u0371%u0372%u0373%u0374%u0375%u0376%u0377%u0378%u0379%u037A%u037B%u037C%u037D%u037E%u037F
+%u0380%u0381%u0382%u0383%u0384%u0385%u0386%u0387%u0388%u0389%u038A%u038B%u038C%u038D%u038E%u038F%u0390%u0391%u0392%u0393%u0394%u0395%u0396%u0397%u0398%u0399%u039A%u039B%u039C%u039D%u039E%u039F
+%u03A0%u03A1%u03A2%u03A3%u03A4%u03A5%u03A6%u03A7%u03A8%u03A9%u03AA%u03AB%u03AC%u03AD%u03AE%u03AF%u03B0%u03B1%u03B2%u03B3%u03B4%u03B5%u03B6%u03B7%u03B8%u03B9%u03BA%u03BB%u03BC%u03BD%u03BE%u03BF
+%u03C0%u03C1%u03C2%u03C3%u03C4%u03C5%u03C6%u03C7%u03C8%u03C9%u03CA%u03CB%u03CC%u03CD%u03CE%u03CF%u03D0%u03D1%u03D2%u03D3%u03D4%u03D5%u03D6%u03D7%u03D8%u03D9%u03DA%u03DB%u03DC%u03DD%u03DE%u03DF
+%u03E0%u03E1%u03E2%u03E3%u03E4%u03E5%u03E6%u03E7%u03E8%u03E9%u03EA%u03EB%u03EC%u03ED%u03EE%u03EF%u03F0%u03F1%u03F2%u03F3%u03F4%u03F5%u03F6%u03F7%u03F8%u03F9%u03FA%u03FB%u03FC%u03FD%u03FE%u03FF
+===*/
+
+/* Test the ASCII range and a part of the non-ASCII range to get both
+ * escape types.
+ */
+
+print('basic');
+
+function basicTest() {
+    var i, j;
+    var tmp;
+
+    for (i = 0; i < 1024; i += 32) {
+        tmp = [];
+        for (j = 0; j < 32; j++) {
+            tmp.push(String.fromCharCode(i + j));
+        }
+        tmp = g.escape(tmp.join(''));
+
+        print(tmp);
+    }
+}
+
+try {
+    basicTest();
+} catch (e) {
+    print(e);
+}
+
+/*===
+bruteforce
+0 3544552
+1024 4228420
+2048 4292466
+3072 4356400
+4096 4208278
+5120 4242406
+6144 4306452
+7168 4370386
+8192 4222264
+9216 4256392
+10240 4320438
+11264 4384372
+12288 4236250
+13312 4270378
+14336 4334424
+15360 4398358
+16384 4250236
+17408 4284364
+18432 4348410
+19456 4412344
+20480 4264222
+21504 4298350
+22528 4362396
+23552 4426330
+24576 4278208
+25600 4312336
+26624 4376382
+27648 4440316
+28672 4292194
+29696 4326322
+30720 4390368
+31744 4454302
+32768 4306180
+33792 4340308
+34816 4404354
+35840 4468288
+36864 4320166
+37888 4354294
+38912 4418340
+39936 4482274
+40960 4432054
+41984 4466182
+43008 4530228
+44032 4594162
+45056 4446040
+46080 4480168
+47104 4544214
+48128 4608148
+49152 4460026
+50176 4494154
+51200 4558200
+52224 4622134
+53248 4474012
+54272 4508140
+55296 4572186
+56320 4636120
+57344 4487998
+58368 4522126
+59392 4586172
+60416 4650106
+61440 4501984
+62464 4536112
+63488 4600158
+64512 4664092
+===*/
+
+/* Bruteforce test of the whole Unicode range, string hash outputs. */
+
+print('bruteforce');
+
+function bruteForceTest() {
+    for (i = 0; i < 65536; i += 1024) {
+        tmp = [];
+        for (j = 0; j < 1024; j++) {
+            tmp.push(String.fromCharCode(i + j));
+        }
+        tmp = tmp.join('');
+
+        tmp = g.escape(tmp);
+        print(i, checkSumString(tmp));
+    }
+}
+
+try {
+    bruteForceTest();
+} catch (e) {
+    print(e);
+}
+
+/*===
+coercion
+coercion
+undefined
+undefined
+null
+true
+false
+1234
+foo
+1%2C2%2C3
+%5Bobject%20Object%5D
+===*/
+
+print('coercion');
+
+function coercionTest() {
+    print(g.escape());
+    print(g.escape(undefined));
+    print(g.escape(null));
+    print(g.escape(true));
+    print(g.escape(false));
+    print(g.escape(1234));
+    print(g.escape('foo'));
+    print(g.escape([1,2,3]));
+    print(g.escape({ foo: 1, bar: 2}));
+}
+
+try {
+    coercionTest();
+} catch (e) {
+    print(e);
+}
+
diff --git a/testcases/test-builtin-string-proto-tolocalelowercase.js b/testcases/test-builtin-string-proto-tolocalelowercase.js
new file mode 100644
index 00000000..ec268665
--- /dev/null
+++ b/testcases/test-builtin-string-proto-tolocalelowercase.js
@@ -0,0 +1,56 @@
+
+/*===
+foobar
+===*/
+
+try {
+    print('fOoBaR'.toLocaleLowerCase());
+} catch (e) {
+    print(e);
+}
+
+/*===
+TypeError
+TypeError
+string 4 true
+string 5 false
+string 3 123
+string 6 foobar
+string 9 1,foo,bar
+string 15 [object object]
+===*/
+
+function coercionTest() {
+    function test(str) {
+        var t;
+
+        try {
+            t = String.prototype.toLocaleLowerCase.call(str);
+            print(typeof t, t.length, t);
+        } catch (e) {
+            print(e.name);
+        }
+    }
+
+    test(undefined);
+    test(null);
+    test(true);
+    test(false);
+    test(123.0);
+    test('FoObAr');
+    test([1,'fOO','Bar']);
+    test({ foo: 1, bar: 2 });
+}
+
+try {
+    coercionTest();
+} catch (e) {
+    print(e);
+}
+
+/* FIXME: basic tests like coercion etc. */
+
+/* FIXME: test that locale specific conversions actually work.
+ * How to force locale for a test?
+ */
+
diff --git a/testcases/test-builtin-string-proto-tolocaleuppercase.js b/testcases/test-builtin-string-proto-tolocaleuppercase.js
new file mode 100644
index 00000000..00cd5e08
--- /dev/null
+++ b/testcases/test-builtin-string-proto-tolocaleuppercase.js
@@ -0,0 +1,56 @@
+
+/*===
+FOOBAR
+===*/
+
+try {
+    print('fOoBaR'.toLocaleUpperCase());
+} catch (e) {
+    print(e);
+}
+
+/*===
+TypeError
+TypeError
+string 4 TRUE
+string 5 FALSE
+string 3 123
+string 6 FOOBAR
+string 9 1,FOO,BAR
+string 15 [OBJECT OBJECT]
+===*/
+
+function coercionTest() {
+    function test(str) {
+        var t;
+
+        try {
+            t = String.prototype.toLocaleUpperCase.call(str);
+            print(typeof t, t.length, t);
+        } catch (e) {
+            print(e.name);
+        }
+    }
+
+    test(undefined);
+    test(null);
+    test(true);
+    test(false);
+    test(123.0);
+    test('FoObAr');
+    test([1,'fOO','Bar']);
+    test({ foo: 1, bar: 2 });
+}
+
+try {
+    coercionTest();
+} catch (e) {
+    print(e);
+}
+
+/* FIXME: basic tests like coercion etc. */
+
+/* FIXME: test that locale specific conversions actually work.
+ * How to force locale for a test?
+ */
+
diff --git a/testcases/test-builtin-string-proto-trim.js b/testcases/test-builtin-string-proto-trim.js
new file mode 100644
index 00000000..4e6902cb
--- /dev/null
+++ b/testcases/test-builtin-string-proto-trim.js
@@ -0,0 +1,79 @@
+// FIXME: util
+var WHITESPACE_CODEPOINTS = [
+    // from WhiteSpace production
+    0x0009,    // <TAB>
+    0x000B,    // <VT>      
+    0x000C,    // <FF>
+    0x0020,    // <SP>
+    0x00A0,    // <NBSP>
+    0xFEFF,    // <BOM>
+
+    // WhiteSpace production also has <USP>, which means any other Unicode
+    // space separator (category Zs), which needs to be checked from (up to
+    // date) Unicode data.  The WhiteSpace-Z.txt file, created as part of
+    // the build, currently contains (duplicates eliminated):
+
+//  0x0020,    // 0020;SPACE;Zs;0;WS;;;;;N;;;;;
+//  0x00A0,    // 00A0;NO-BREAK SPACE;Zs;0;CS;<noBreak> 0020;;;;N;NON-BREAKING SPACE;;;;
+    0x1680,    // 1680;OGHAM SPACE MARK;Zs;0;WS;;;;;N;;;;;
+    0x180E,    // 180E;MONGOLIAN VOWEL SEPARATOR;Zs;0;WS;;;;;N;;;;;
+    0x2000,    // 2000;EN QUAD;Zs;0;WS;2002;;;;N;;;;;
+    0x2001,    // 2001;EM QUAD;Zs;0;WS;2003;;;;N;;;;;
+    0x2002,    // 2002;EN SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;;
+    0x2003,    // 2003;EM SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;;
+    0x2004,    // 2004;THREE-PER-EM SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;;
+    0x2005,    // 2005;FOUR-PER-EM SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;;
+    0x2006,    // 2006;SIX-PER-EM SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;;
+    0x2007,    // 2007;FIGURE SPACE;Zs;0;WS;<noBreak> 0020;;;;N;;;;;
+    0x2008,    // 2008;PUNCTUATION SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;;
+    0x2009,    // 2009;THIN SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;;
+    0x200A,    // 200A;HAIR SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;;
+//  0x2028,    // 2028;LINE SEPARATOR;Zl;0;WS;;;;;N;;;;;
+//  0x2029,    // 2029;PARAGRAPH SEPARATOR;Zp;0;B;;;;;N;;;;;
+    0x202F,    // 202F;NARROW NO-BREAK SPACE;Zs;0;CS;<noBreak> 0020;;;;N;;;;;
+    0x205F,    // 205F;MEDIUM MATHEMATICAL SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;;
+    0x3000,    // 3000;IDEOGRAPHIC SPACE;Zs;0;WS;<wide> 0020;;;;N;;;;;
+ 
+    // from LineTerminator production
+    0x000a,    // <LF>
+    0x000d,    // <CR>
+    0x2028,    // <LS>
+    0x2029,    // <PS>
+];
+
+/*===
+string 3 foo
+string 3 foo
+string 3 foo
+string 3 foo
+===*/
+
+function basicTest() {
+    var all_ws;
+    var i;
+
+    function test(str) {
+        var t;
+
+        t = str.trim();
+        print(typeof t, t.length, t);
+    }
+
+    all_ws = [];
+    for (i = 0; i < WHITESPACE_CODEPOINTS; i++) {
+        all_ws.push(String.fromCharCode(i));
+    }
+    all_ws = all_ws.join('');
+
+    test('foo');
+    test('  foo');
+    test('foo  ');
+    test(all_ws + 'foo' + all_ws);
+}
+
+try {
+    basicTest();
+} catch (e) {
+    print(e);
+}
+