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 b42a879704e7aedd9c81a58a9b1c5ce1fb0382e3..4faaf02aed0bfa2154bda58439cb7183451b12ef 100644
--- a/test/compiled/String.cpp
+++ b/test/compiled/String.cpp
@@ -21,6 +21,23 @@
 
 ABP_NS_USING
 
+TEST(TestString, checkConstexprCorrectness)
+{
+  static constexpr DependentString s(u"Hello world!");
+  static constexpr DependentString s2;
+
+  static_assert(s.length() == 12, "Length should be 12");
+
+  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] == 'H', "First character should be 'H'");
+  static_assert(s[1] == 'e', "Second character should be 'e'");
+
+  static_assert(s2.is_invalid(), "String should be invalid");
+}
+
 TEST(TestString, constructInvalidDependentString)
 {
   DependentString s;