Add unit test for attribute filtering

yaserde_derive/src/common/attribute.rs

@@ -235,6 +235,55 @@ fn parse_attributes() {
   );
 }
 
+#[test]
+fn only_parse_yaserde_attributes() {
+  use proc_macro2::{Span, TokenStream};
+  use std::str::FromStr;
+  use syn::punctuated::Punctuated;
+  use syn::token::Bracket;
+  use syn::token::Pound;
+  use syn::AttrStyle::Outer;
+  use syn::{Ident, Path, PathArguments, PathSegment};
+
+  let mut punctuated = Punctuated::new();
+  punctuated.push(PathSegment {
+    ident: Ident::new("serde", Span::call_site()),
+    arguments: PathArguments::None,
+  });
+
+  let attributes = vec![Attribute {
+    pound_token: Pound {
+      spans: [Span::call_site()],
+    },
+    style: Outer,
+    bracket_token: Bracket {
+      span: Span::call_site(),
+    },
+    path: Path {
+      leading_colon: None,
+      segments: punctuated,
+    },
+    tokens: TokenStream::from_str("(flatten)").unwrap(),
+  }];
+
+  let attrs = YaSerdeAttribute::parse(&attributes);
+
+  assert_eq!(
+    YaSerdeAttribute {
+      attribute: false,
+      default: None,
+      default_namespace: None,
+      flatten: false,
+      namespaces: BTreeMap::new(),
+      prefix: None,
+      rename: None,
+      skip_serializing_if: None,
+      text: false,
+    },
+    attrs
+  );
+}
+
 #[test]
 fn parse_attributes_with_values() {
   use proc_macro2::{Span, TokenStream};