feat(test): Allow setting edition on published packages

Author: epage

crates/cargo-test-support/src/registry.rs

@@ -571,6 +571,7 @@ pub struct Package {
     local: bool,
     alternative: bool,
     invalid_json: bool,
+    edition: Option<String>,
     resolver: Option<String>,
     proc_macro: bool,
     links: Option<String>,
@@ -1251,6 +1252,7 @@ impl Package {
             local: false,
             alternative: false,
             invalid_json: false,
+            edition: None,
             resolver: None,
             proc_macro: false,
             links: None,
@@ -1387,6 +1389,12 @@ impl Package {
         self
     }
 
+    /// Specifies `package.edition`
+    pub fn edition(&mut self, edition: &str) -> &mut Package {
+        self.edition = Some(edition.to_owned());
+        self
+    }
+
     /// Specifies `package.resolver`
     pub fn resolver(&mut self, resolver: &str) -> &mut Package {
         self.resolver = Some(resolver.to_owned());
@@ -1581,6 +1589,10 @@ impl Package {
             manifest.push_str(&format!("rust-version = \"{}\"\n", version));
         }
 
+        if let Some(edition) = &self.edition {
+            manifest.push_str(&format!("edition = \"{}\"\n", edition));
+        }
+
         if let Some(resolver) = &self.resolver {
             manifest.push_str(&format!("resolver = \"{}\"\n", resolver));
         }