From 9ed051d56ef14290e532be2716b6f4fe6924b935 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Fri, 11 Nov 2022 13:42:32 +0100
Subject: test: add unit tests for parsing declare_default_factory macro args

---
 macros/src/factory/declare_default_args.rs | 178 ++++++++++++++++++++++++++++-
 1 file changed, 175 insertions(+), 3 deletions(-)

(limited to 'macros/src/factory')

diff --git a/macros/src/factory/declare_default_args.rs b/macros/src/factory/declare_default_args.rs
index d19eba8..0828f9e 100644
--- a/macros/src/factory/declare_default_args.rs
+++ b/macros/src/factory/declare_default_args.rs
@@ -17,7 +17,7 @@ impl Parse for DeclareDefaultFactoryMacroArgs
 {
     fn parse(input: syn::parse::ParseStream) -> syn::Result<Self>
     {
-        let interface = input.parse().unwrap();
+        let interface = input.parse()?;
 
         if !input.peek(Token![,]) {
             return Ok(Self {
@@ -26,7 +26,7 @@ impl Parse for DeclareDefaultFactoryMacroArgs
             });
         }
 
-        input.parse::<Token![,]>().unwrap();
+        input.parse::<Token![,]>()?;
 
         let flags = Punctuated::<MacroFlag, Token![,]>::parse_terminated(input)?;
 
@@ -48,9 +48,181 @@ impl Parse for DeclareDefaultFactoryMacroArgs
             .collect::<Vec<_>>();
 
         if let Some(dupe_flag_name) = flag_names.iter().find_duplicate() {
-            return Err(input.error(format!("Duplicate flag '{}'", dupe_flag_name)));
+            return Err(input.error(format!("Duplicate flag '{dupe_flag_name}'")));
         }
 
         Ok(Self { interface, flags })
     }
 }
+
+#[cfg(test)]
+mod tests
+{
+    use std::error::Error;
+
+    use proc_macro2::Span;
+    use quote::{format_ident, quote};
+    use syn::token::Dyn;
+    use syn::{
+        parse2,
+        Path,
+        PathArguments,
+        PathSegment,
+        TraitBound,
+        TraitBoundModifier,
+        Type,
+        TypeParamBound,
+        TypeTraitObject,
+    };
+
+    use super::*;
+    use crate::macro_flag::MacroFlag;
+
+    #[test]
+    fn can_parse_with_interface_only() -> Result<(), Box<dyn Error>>
+    {
+        let input_args = quote! {
+            dyn IFoo
+        };
+
+        let dec_def_fac_args = parse2::<DeclareDefaultFactoryMacroArgs>(input_args)?;
+
+        assert_eq!(
+            dec_def_fac_args.interface,
+            Type::TraitObject(TypeTraitObject {
+                dyn_token: Some(Dyn::default()),
+                bounds: Punctuated::from_iter(vec![TypeParamBound::Trait(TraitBound {
+                    paren_token: None,
+                    modifier: TraitBoundModifier::None,
+                    lifetimes: None,
+                    path: Path {
+                        leading_colon: None,
+                        segments: Punctuated::from_iter(vec![PathSegment {
+                            ident: format_ident!("IFoo"),
+                            arguments: PathArguments::None
+                        }])
+                    }
+                })])
+            })
+        );
+
+        assert!(dec_def_fac_args.flags.is_empty());
+
+        Ok(())
+    }
+
+    #[test]
+    fn can_parse_with_interface_and_single_flag() -> Result<(), Box<dyn Error>>
+    {
+        let input_args = quote! {
+            dyn IBar, threadsafe = true
+        };
+
+        let dec_def_fac_args = parse2::<DeclareDefaultFactoryMacroArgs>(input_args)?;
+
+        assert_eq!(
+            dec_def_fac_args.interface,
+            Type::TraitObject(TypeTraitObject {
+                dyn_token: Some(Dyn::default()),
+                bounds: Punctuated::from_iter(vec![TypeParamBound::Trait(TraitBound {
+                    paren_token: None,
+                    modifier: TraitBoundModifier::None,
+                    lifetimes: None,
+                    path: Path {
+                        leading_colon: None,
+                        segments: Punctuated::from_iter(vec![PathSegment {
+                            ident: format_ident!("IBar"),
+                            arguments: PathArguments::None
+                        }])
+                    }
+                })])
+            })
+        );
+
+        assert_eq!(
+            dec_def_fac_args.flags,
+            Punctuated::from_iter(vec![MacroFlag {
+                flag: format_ident!("threadsafe"),
+                is_on: syn::LitBool::new(true, Span::call_site())
+            }])
+        );
+
+        Ok(())
+    }
+
+    #[test]
+    fn can_parse_with_interface_and_multiple_flags() -> Result<(), Box<dyn Error>>
+    {
+        let input_args = quote! {
+            dyn IBar, threadsafe = true, async = false
+        };
+
+        let dec_def_fac_args = parse2::<DeclareDefaultFactoryMacroArgs>(input_args)?;
+
+        assert_eq!(
+            dec_def_fac_args.interface,
+            Type::TraitObject(TypeTraitObject {
+                dyn_token: Some(Dyn::default()),
+                bounds: Punctuated::from_iter(vec![TypeParamBound::Trait(TraitBound {
+                    paren_token: None,
+                    modifier: TraitBoundModifier::None,
+                    lifetimes: None,
+                    path: Path {
+                        leading_colon: None,
+                        segments: Punctuated::from_iter(vec![PathSegment {
+                            ident: format_ident!("IBar"),
+                            arguments: PathArguments::None
+                        }])
+                    }
+                })])
+            })
+        );
+
+        assert_eq!(
+            dec_def_fac_args.flags,
+            Punctuated::from_iter(vec![
+                MacroFlag {
+                    flag: format_ident!("threadsafe"),
+                    is_on: syn::LitBool::new(true, Span::call_site())
+                },
+                MacroFlag {
+                    flag: format_ident!("async"),
+                    is_on: syn::LitBool::new(false, Span::call_site())
+                }
+            ])
+        );
+
+        Ok(())
+    }
+
+    #[test]
+    fn cannot_parse_with_interface_and_invalid_flag()
+    {
+        let input_args = quote! {
+            dyn IBar, async = true, foo = false
+        };
+
+        assert!(matches!(
+            parse2::<DeclareDefaultFactoryMacroArgs>(input_args),
+            Err(_)
+        ));
+    }
+
+    #[test]
+    fn cannot_parse_with_interface_and_duplicate_flag()
+    {
+        assert!(matches!(
+            parse2::<DeclareDefaultFactoryMacroArgs>(quote! {
+                dyn IBar, async = true, threadsafe = false, async = true
+            }),
+            Err(_)
+        ));
+
+        assert!(matches!(
+            parse2::<DeclareDefaultFactoryMacroArgs>(quote! {
+                dyn IBar, async = true, threadsafe = false, async = false
+            }),
+            Err(_)
+        ));
+    }
+}
-- 
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