Add test attribute macro

Cargo.toml

@@ -13,6 +13,7 @@ readme = "README.md"
 proc-macro = true
 
 [dev-dependencies]
+paste-test-suite = { version = "0", path = "tests/macros" }
 rustversion = "1.0"
 trybuild = "1.0"
 

tests/macros/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "paste-test-suite"
+version = "0.0.0"
+edition = "2018"
+publish = false
+
+[lib]
+path = "lib.rs"
+proc-macro = true

tests/macros/lib.rs

@@ -0,0 +1,23 @@
+use proc_macro::{TokenStream, TokenTree};
+
+#[proc_macro_attribute]
+pub fn paste_test(args: TokenStream, input: TokenStream) -> TokenStream {
+    let mut iter = args.clone().into_iter();
+    match iter.next() {
+        Some(TokenTree::Ident(_)) => {}
+        _ => panic!("{}", args),
+    }
+    match iter.next() {
+        Some(TokenTree::Punct(punct)) if punct.as_char() == '=' => {}
+        _ => panic!("{}", args),
+    }
+    match iter.next() {
+        Some(TokenTree::Literal(literal)) if literal.to_string().starts_with('"') => {}
+        _ => panic!("{}", args),
+    }
+    match iter.next() {
+        None => {}
+        _ => panic!("{}", args),
+    }
+    input
+}

tests/test_attr.rs

@@ -1,4 +1,23 @@
 use paste::paste;
+use paste_test_suite::paste_test;
+
+#[test]
+fn test_attr() {
+    paste! {
+        #[paste_test(k = "val" "ue")]
+        struct A;
+
+        #[paste_test_suite::paste_test(k = "val" "ue")]
+        struct B;
+
+        #[::paste_test_suite::paste_test(k = "val" "ue")]
+        struct C;
+    }
+
+    let _ = A;
+    let _ = B;
+    let _ = C;
+}
 
 #[test]
 fn test_paste_cfg() {