add FluentNumber grouping test

fluent-bundle/Cargo.toml

@@ -42,6 +42,7 @@ smallvec = "1"
 [dev-dependencies]
 criterion.workspace = true
 iai.workspace = true
+icu_testdata = "1"
 serde = { workspace = true, features = ["derive"]}
 unic-langid = { workspace = true, features = ["macros"] }
 rand = "0.8"

fluent-bundle/src/bundle.rs

@@ -549,6 +549,10 @@ impl<R, M> FluentBundle<R, M> {
             }),
         }
     }
+
+    pub fn set_number_format_provider(&mut self, provider: NumberFormatProvider) {
+        self.number_format_provider = Some(provider);
+    }
 }
 
 impl<R> Default for FluentBundle<R, IntlLangMemoizer> {

fluent-bundle/tests/types_test.rs

@@ -1,6 +1,7 @@
 use fluent_bundle::resolver::Scope;
 use fluent_bundle::types::{
-    FluentNumber, FluentNumberCurrencyDisplayStyle, FluentNumberOptions, FluentNumberStyle, FluentNumberUseGrouping,
+    FluentNumber, FluentNumberCurrencyDisplayStyle, FluentNumberOptions, FluentNumberStyle,
+    FluentNumberUseGrouping,
 };
 use fluent_bundle::FluentArgs;
 use fluent_bundle::FluentBundle;
@@ -154,3 +155,24 @@ fn fluent_number_to_operands() {
         }
     );
 }
+
+#[test]
+fn fluent_number_grouping() {
+    let langid_ars = langid!("ccp");
+    let mut bundle: FluentBundle<FluentResource> = FluentBundle::new(vec![langid_ars]);
+    bundle.set_number_format_provider(Box::new(icu_testdata::unstable_no_fallback()));
+
+    let mut number = FluentNumber::from(1234567890.1234567);
+
+    number.options.use_grouping = FluentNumberUseGrouping::False;
+    let no_grouping = number.as_string(&bundle);
+    assert_eq!(no_grouping, "𑄷𑄸𑄹𑄺𑄻𑄼𑄽𑄾𑄿𑄶.𑄷𑄸𑄹𑄺𑄻𑄼𑄽");
+
+    number.options.use_grouping = FluentNumberUseGrouping::Min2;
+    let long = number.as_string(&bundle);
+    assert_eq!(long, "𑄷,𑄸𑄹,𑄺𑄻,𑄼𑄽,𑄾𑄿𑄶.𑄷𑄸𑄹𑄺𑄻𑄼𑄽");
+
+    number.value = -1234.0;
+    let short = number.as_string(&bundle);
+    assert_eq!(short, "-𑄷𑄸𑄹𑄺");
+}