feat(verifier): support fallback_branch & matching_tag consumer versi…

…on selectors

relates to pact-foundation#195
cross tracking issue for ruby/rust cores pact-foundation/docs.pact.io#171

rust/pact_verifier/src/pact_broker.rs

@@ -1026,6 +1026,12 @@ pub struct ConsumerVersionSelector {
   pub branch: Option<String>,
   /// Applications that match the the provider version branch sent during verification
   pub matching_branch: Option<bool>,
+  /// the name of the branch to fallback to if the specified branch does not exist. 
+  /// Use of this property is discouraged as it may allow a pact to pass on a feature branch while breaking backwards compatibility with the main branch, which is generally not desired. 
+  /// It is better to use two separate consumer version selectors, one with the main branch name, and one with the feature branch name, rather than use this property
+  pub fallback_branch: Option<String>,
+  /// Applications that match the the provider version tag sent during verification
+  pub matching_tag: Option<bool>,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone)]
@@ -1826,6 +1832,8 @@ mod tests {
         main_branch: None,
         matching_branch: None,
         environment: None,
+        fallback_branch: None,
+        matching_tag: None
       }), None).await;
 
       match &result {
@@ -1925,6 +1933,8 @@ mod tests {
       main_branch: None,
       matching_branch: None,
       environment: None,
+      fallback_branch: None,
+      matching_tag: None
     }), None).await;
 
     match result {
@@ -2026,6 +2036,8 @@ mod tests {
         main_branch: None,
         matching_branch: None,
         environment: None,
+        fallback_branch: None,
+        matching_tag: None
       }),
       None
     ).await;

rust/pact_verifier/src/selectors.rs

@@ -24,6 +24,8 @@ pub fn consumer_tags_to_selectors(tags: Vec<&str>) -> Vec<ConsumerVersionSelecto
       main_branch: None,
       environment: None,
       matching_branch: None,
+      fallback_branch: None,
+      matching_tag: None,
     }
   }).collect()
 }