From 8036395385c32e8b2e143ad671ca55ab104a5df0 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Fri, 11 Nov 2022 16:06:51 +0100
Subject: test: add unit test for parsing factory type aliases

---
 macros/src/factory/type_alias.rs | 53 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 47 insertions(+), 6 deletions(-)

diff --git a/macros/src/factory/type_alias.rs b/macros/src/factory/type_alias.rs
index 64afe57..9ec2b3a 100644
--- a/macros/src/factory/type_alias.rs
+++ b/macros/src/factory/type_alias.rs
@@ -1,7 +1,7 @@
 use quote::ToTokens;
 use syn::parse::{Parse, ParseStream};
 use syn::punctuated::Punctuated;
-use syn::{parse, ItemType, Token, Type};
+use syn::{parse2, ItemType, Token, Type};
 
 use crate::fn_trait::FnTrait;
 
@@ -17,13 +17,12 @@ impl Parse for FactoryTypeAlias
 {
     fn parse(input: ParseStream) -> syn::Result<Self>
     {
-        let type_alias = match input.parse::<ItemType>() {
-            Ok(type_alias) => Ok(type_alias),
-            Err(_) => Err(input.error("Expected a type alias")),
-        }?;
+        let type_alias = input
+            .parse::<ItemType>()
+            .map_err(|_| input.error("Expected a type alias"))?;
 
         let aliased_fn_trait =
-            parse::<FnTrait>(type_alias.ty.as_ref().to_token_stream().into())?;
+            parse2::<FnTrait>(type_alias.ty.as_ref().to_token_stream())?;
 
         Ok(Self {
             type_alias,
@@ -33,3 +32,45 @@ impl Parse for FactoryTypeAlias
         })
     }
 }
+
+#[cfg(test)]
+mod tests
+{
+    use std::error::Error;
+
+    use quote::{format_ident, quote};
+    use syn::token::And;
+    use syn::{Path, PathSegment, TypePath, TypeReference};
+
+    use super::*;
+    use crate::test_utils;
+
+    #[test]
+    fn can_parse() -> Result<(), Box<dyn Error>>
+    {
+        let input_args = quote! {
+            type FooFactory = dyn Fn(String, &u32) -> Foo;
+        };
+
+        let factory_type_alias = parse2::<FactoryTypeAlias>(input_args)?;
+
+        assert_eq!(
+            factory_type_alias.arg_types,
+            Punctuated::from_iter(vec![
+                test_utils::create_type(test_utils::create_path(&[
+                    test_utils::create_path_segment(format_ident!("String"), &[])
+                ])),
+                Type::Reference(TypeReference {
+                    and_token: And::default(),
+                    lifetime: None,
+                    mutability: None,
+                    elem: Box::new(test_utils::create_type(test_utils::create_path(&[
+                        test_utils::create_path_segment(format_ident!("u32"), &[])
+                    ])))
+                })
+            ])
+        );
+
+        Ok(())
+    }
+}
-- 
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