Fix Regex Character Class Escape Tests

For each character class escape (\d, \D, \s, \S, \w, \W), check
positive cases (the escape matches all characters it's supposed to
match) and negative cases (the escape doesn't match any of the
characters it should not match).  Each of these checks is also done in
Unicode mode.

This is part of my work at the SYSTEMF lab at EPFL.

test/built-ins/RegExp/CharacterClassEscapes/character-class-digit-negative-cases.js

@@ -0,0 +1,47 @@
+// Copyright (C) 2018 Leo Balter.  All rights reserved.
+// Copyright (C) 2024 Aurèle Barrière.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: prod-CharacterClassEscape
+description: Check that none of the non-digit characters are matched by \d.
+info: |
+    21.2.2.12 CharacterClassEscape
+
+    The production CharacterClassEscape :: d evaluates as follows:
+        Return the ten-element set of characters containing the characters 0 through 9 inclusive.
+features: [String.fromCodePoint]
+includes: [regExpUtils.js]
+---*/
+
+const str = buildString({
+  loneCodePoints: [],
+  ranges: [
+      [0x000000, 0x00002F],
+      [0x00003A, 0x10FFFF],
+  ],
+});
+
+const re = /\d/;
+const re_u = /\d/u;
+
+const regexes = [re, re_u];
+
+const errors = [];
+
+for (const regex of regexes) {
+    if (regex.test(str)) {
+	// Error, let's find out where
+	for (const char of str) {
+	    if (regex.test(char)) {
+		errors.push('0x' + char.codePointAt(0).toString(16));
+            }
+	}
+    }
+};
+
+assert.sameValue(
+    errors.length,
+    0,
+    'Expected no match, but matched: ' + errors.join(',')
+);

test/built-ins/RegExp/CharacterClassEscapes/character-class-digit-positive-cases.js

@@ -0,0 +1,46 @@
+// Copyright (C) 2018 Leo Balter.  All rights reserved.
+// Copyright (C) 2024 Aurèle Barrière.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: prod-CharacterClassEscape
+description: Check that all digit characters are matched by \d.
+info: |
+    21.2.2.12 CharacterClassEscape
+
+    The production CharacterClassEscape :: d evaluates as follows:
+        Return the ten-element set of characters containing the characters 0 through 9 inclusive.
+features: [String.fromCodePoint]
+includes: [regExpUtils.js]
+---*/
+
+const str = buildString({
+    loneCodePoints: [],
+    ranges: [
+        [0x0030, 0x0039],
+    ],
+});
+
+const re = /^\d+$/;
+const re_u = /^\d+$/u;
+
+const regexes = [re, re_u];
+
+const errors = [];
+
+for (const regex of regexes) {
+    if (!regex.test(str)) {
+	// Error, let's find out where
+	for (const char of str) {
+	    if (!regex.test(char)) {
+		errors.push('0x' + char.codePointAt(0).toString(16));
+            }
+	}
+    }
+};
+
+assert.sameValue(
+    errors.length,
+    0,
+    'Expected full match, but did not match: ' + errors.join(',')
+);