Move and add new RegEx test cases

Test cases for 'RegEx' are moved from 'test_string.h' to own test suite
in 'test_regex.h'. Additionally, new tests are introduced and '_init' is
removed as it isn't implemented/used anywhere.

modules/regex/regex.h

@@ -83,7 +83,6 @@ protected:
 public:
 	void clear();
 	Error compile(const String &p_pattern);
-	void _init(const String &p_pattern = "");
 
 	Ref<RegExMatch> search(const String &p_subject, int p_offset = 0, int p_end = -1) const;
 	Array search_all(const String &p_subject, int p_offset = 0, int p_end = -1) const;

modules/regex/tests/test_regex.h

@@ -0,0 +1,164 @@
+/*************************************************************************/
+/*  test_regex.h                                                         */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef TEST_REGEX_H
+#define TEST_REGEX_H
+
+#include "core/string/ustring.h"
+#include "modules/regex/regex.h"
+
+#include "tests/test_macros.h"
+
+namespace TestRegEx {
+
+TEST_CASE("[RegEx] Initialization") {
+	const String pattern = "(?<vowel>[aeiou])";
+
+	RegEx re1(pattern);
+	CHECK(re1.is_valid());
+	CHECK(re1.get_pattern() == pattern);
+	CHECK(re1.get_group_count() == 1);
+
+	Array names = re1.get_names();
+	CHECK(names.size() == 1);
+	CHECK(names[0] == "vowel");
+
+	RegEx re2;
+	CHECK(re2.is_valid() == false);
+	CHECK(re2.compile(pattern) == OK);
+	CHECK(re2.is_valid());
+
+	CHECK(re1.get_pattern() == re2.get_pattern());
+	CHECK(re1.get_group_count() == re2.get_group_count());
+
+	names = re2.get_names();
+	CHECK(names.size() == 1);
+	CHECK(names[0] == "vowel");
+}
+
+TEST_CASE("[RegEx] Clearing") {
+	RegEx re("Godot");
+	REQUIRE(re.is_valid());
+	re.clear();
+	CHECK(re.is_valid() == false);
+}
+
+TEST_CASE("[RegEx] Searching") {
+	const String s = "Searching";
+	const String vowels = "[aeiou]{1,2}";
+	const String numerics = "\\d";
+
+	RegEx re(vowels);
+	REQUIRE(re.is_valid());
+
+	Ref<RegExMatch> match = re.search(s);
+	REQUIRE(match != nullptr);
+	CHECK(match->get_string(0) == "ea");
+
+	match = re.search(s, 2, 4);
+	REQUIRE(match != nullptr);
+	CHECK(match->get_string(0) == "a");
+
+	const Array all_results = re.search_all(s);
+	CHECK(all_results.size() == 2);
+	match = all_results[0];
+	REQUIRE(match != nullptr);
+	CHECK(match->get_string(0) == "ea");
+	match = all_results[1];
+	REQUIRE(match != nullptr);
+	CHECK(match->get_string(0) == "i");
+
+	CHECK(re.compile(numerics) == OK);
+	CHECK(re.is_valid());
+	CHECK(re.search(s) == nullptr);
+	CHECK(re.search_all(s).size() == 0);
+}
+
+TEST_CASE("[RegEx] Substitution") {
+	String s = "Double all the vowels.";
+
+	RegEx re("(?<vowel>[aeiou])");
+	REQUIRE(re.is_valid());
+	CHECK(re.sub(s, "$0$vowel", true) == "Doouublee aall thee vooweels.");
+}
+
+TEST_CASE("[RegEx] Uninitialized use") {
+	const String s = "Godot";
+
+	RegEx re;
+	ERR_PRINT_OFF;
+	CHECK(re.search(s) == nullptr);
+	CHECK(re.search_all(s).size() == 0);
+	CHECK(re.sub(s, "") == "");
+	CHECK(re.get_group_count() == 0);
+	CHECK(re.get_names().size() == 0);
+	ERR_PRINT_ON
+}
+
+TEST_CASE("[RegEx] Empty Pattern") {
+	const String s = "Godot";
+
+	RegEx re;
+	CHECK(re.compile("") == OK);
+	CHECK(re.is_valid());
+}
+
+TEST_CASE("[RegEx] Invalid offset") {
+	const String s = "Godot";
+
+	RegEx re("o");
+	REQUIRE(re.is_valid());
+	CHECK(re.search(s, -1) == nullptr);
+	CHECK(re.search_all(s, -1).size() == 0);
+	CHECK(re.sub(s, "", true, -1) == "");
+}
+
+TEST_CASE("[RegEx] Invalid end position") {
+	const String s = "Godot";
+
+	RegEx re("o");
+	REQUIRE(re.is_valid());
+	Ref<RegExMatch> match = re.search(s, 0, 10);
+	CHECK(match->get_string(0) == "o");
+
+	const Array all_results = re.search_all(s, 0, 10);
+	CHECK(all_results.size() == 2);
+	match = all_results[0];
+	REQUIRE(match != nullptr);
+	CHECK(match->get_string(0) == String("o"));
+	match = all_results[1];
+	REQUIRE(match != nullptr);
+	CHECK(match->get_string(0) == String("o"));
+
+	CHECK(re.sub(s, "", true, 0, 10) == "Gdt");
+}
+} // namespace TestRegEx
+
+#endif // TEST_REGEX_H

tests/test_string.h

@@ -40,10 +40,6 @@
 #include "core/os/os.h"
 #include "core/string/ustring.h"
 
-#ifdef MODULE_REGEX_ENABLED
-#include "modules/regex/regex.h"
-#endif
-
 #include "tests/test_macros.h"
 
 namespace TestString {
@@ -475,15 +471,6 @@ TEST_CASE("[String] Erasing") {
 	CHECK(s == "Josephine is such a girl!");
 }
 
-#ifdef MODULE_REGEX_ENABLED
-TEST_CASE("[String] Regex substitution") {
-	String s = "Double all the vowels.";
-	RegEx re("(?<vowel>[aeiou])");
-	s = re.sub(s, "$0$vowel", true);
-	CHECK(s == "Doouublee aall thee vooweels.");
-}
-#endif
-
 struct test_27_data {
 	char const *data;
 	char const *part;