LibJS: Implement a nearly empty Intl.DateTimeFormat object

This adds plumbing for the Intl.DateTimeFormat object, constructor, and
prototype.

Note that unlike other Intl objects, the Intl.DateTimeFormat object has
a LibUnicode structure as a base. This is to prevent wild amounts of
code duplication between LibUnicode, Intl.DateTimeFormat, and other
not-yet-defined Intl structures, because there's 12 fields shared
between them.

2 files changed, 8 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Tests/builtins/Intl/DateTimeFormat/DateTimeFormat.@@toStringTag.js b/Userland/Libraries/LibJS/Tests/builtins/Intl/DateTimeFormat/DateTimeFormat.@@toStringTag.js
new file mode 100644
index 0000000000..be1abf847d
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Intl/DateTimeFormat/DateTimeFormat.@@toStringTag.js
@@ -0,0 +1,3 @@
+test("basic functionality", () => {
+    expect(Intl.DateTimeFormat.prototype[Symbol.toStringTag]).toBe("Intl.DateTimeFormat");
+});
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Intl/DateTimeFormat/DateTimeFormat.js b/Userland/Libraries/LibJS/Tests/builtins/Intl/DateTimeFormat/DateTimeFormat.js
new file mode 100644
index 0000000000..685320f262
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Intl/DateTimeFormat/DateTimeFormat.js
@@ -0,0 +1,5 @@
+describe("normal behavior", () => {
+    test("length is 0", () => {
+        expect(Intl.DateTimeFormat).toHaveLength(0);
+    });
+});