Add tests for impl Value for Option<V: Value>

Add tests for making an `Option<T> where T: Value` a value in itself.

tracing/tests/event.rs

@@ -374,3 +374,30 @@ fn explicit_child_at_levels() {
 
     handle.assert_finished();
 }
+
+#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
+#[test]
+fn option_values() {
+    let (collector, handle) = collector::mock()
+        .event(event::mock()
+            .with_fields(
+                field::mock("some_str").with_value(&Some("yes"))
+                .and(field::mock("some_bool").with_value(&Some(true)))
+                .and(field::mock("some_u64").with_value(&Some(42_u64)))
+            )
+        )
+        .done()
+        .run_with_handle();
+
+    with_default(collector, || {
+        let some_str = Some("yes");
+        let none_str: Option<&'static str> = None;
+        let some_bool = Some(true);
+        let none_bool: Option<bool> = None;
+        let some_u64 = Some(42_u64);
+        let none_u64: Option<u64> = None;
+        trace!(some_str = some_str, none_str = none_str, some_bool = some_bool, none_bool = none_bool, some_u64 = some_u64, none_u64 = none_u64);
+    });
+
+    handle.assert_finished();
+}