test: remove unneeded test logic

Author: vohoanglong0107

src/bors/handlers/trybuild.rs

@@ -427,6 +427,8 @@ mod tests {
             &[
                 "ea9c1b050cc8b420c2c211d2177811e564a4dc60",
                 &default_merge_sha(),
+                "ea9c1b050cc8b420c2c211d2177811e564a4dc60",
+                &default_merge_sha(),
             ],
         );
     }

src/tests/state.rs

@@ -359,16 +359,7 @@ impl RepositoryClient for TestRepositoryClient {
     }
 
     async fn set_branch_to_sha(&mut self, branch: &str, sha: &CommitSha) -> anyhow::Result<()> {
-        let branch_history = self.branch_history.entry(branch.to_string()).or_default();
-        let position = branch_history.iter().position(|s| s == sha);
-        match position {
-            None => branch_history.push(sha.clone()),
-            Some(p) => {
-                let (his, _) = branch_history.split_at(p + 1);
-                let his = his.to_vec();
-                self.branch_history.insert(branch.to_string(), his);
-            }
-        }
+        self.add_branch_sha(branch, &sha.0);
         Ok(())
     }