Issue 6378 - [emscripten] Make DependentString constexpr

test/compiled/String.cpp

Index: test/compiled/String.cpp
diff --git a/test/compiled/String.cpp b/test/compiled/String.cpp
index e969ccde556eb61d9b3b67a6303fca1eddec8b9b..24ad850b04dd11c8c597c7f74877196707cb6285 100644
--- a/test/compiled/String.cpp
+++ b/test/compiled/String.cpp
@@ -10,7 +10,7 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- *
+
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
@@ -21,6 +21,45 @@
 
 ABP_NS_USING
 
+constexpr void checkConstexprTemplateCtor()
+{
+  constexpr DependentString s(u"Test string");
+}
+
+constexpr void checkConstexprInvalidCtor()
+{
+  constexpr DependentString s;
+  static_assert(s.is_invalid(), "String should be invalid");
+}
+
+constexpr void checkConstexprCtor()
+{
+  constexpr DependentString s(u"Test string", 11);
+}
+
+constexpr void checkConstexprFuncsAndOps()
+{
+  constexpr DependentString s = u"Test string"_str;
+  constexpr DependentString s2 = u"Test string"_str;
+  constexpr DependentString s3 = u"Another test string"_str;
+
+  static_assert(s.length() == s2.length(), "Length should be equal");
+  static_assert(s.equals(s2), "Strings should be equal");
+  static_assert(s == s2, "Strings should be equal");
+  static_assert(s != s3, "Strings should not be equal");
+
+  static_assert(!s.empty(), "String should not be empty");
+  static_assert(!s.is_writable(), "String should not be writable");
+  static_assert(!s.is_deleted(), "String should not be deleted");
+
+  static_assert(s.data()[0] == 'T', "First character should be 'T'");
+  static_assert(s[1] == 'e', "Second character should be 'e'");
+
+  static_assert(s.find(u'e') == 1, "'e' should be at pos 1");
+  static_assert(s.find(s2) == 0, "String should be found at pos 0");
+  static_assert(s.rfind(u'e') == 1, "'e' should be at pos 1");
+}
+
 TEST(TestString, constructInvalidDependentString)
 {
   DependentString s;