diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..8560f47
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,9 @@
+kind: pipeline
+name: tools
+
+steps:
+  - name: rust tests
+    image: "rust:1"
+    pull: always
+    commands:
+      - cargo test
diff --git a/Cargo.lock b/Cargo.lock
index 08bdde6..2853be6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -339,6 +339,7 @@ dependencies = [
  "serde",
  "serde_json",
  "structopt",
+ "tempfile",
  "tokio",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 2ab2c4a..d3d4ca3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,5 +20,8 @@ serde = { version = "1.0", features = ["derive"] }
 structopt = { version = "0.3", default-features = false }
 tokio = { version = "0.2", features = ["macros"] }
 
+[dev-dependencies]
+tempfile = "3"
+
 [profile.release]
 lto = true
diff --git a/README.md b/README.md
index 54ed4d9..bef1eb0 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 # gitea-release
 
+[![built with nix](https://builtwithnix.org/badge.svg)](https://builtwithnix.org)
+[![Build Status](https://drone.tulpa.dev/api/badges/cadey/gitea-release/status.svg)](https://drone.tulpa.dev/cadey/gitea-release)
+
 A small command line tool to automate releases for [Gitea](https://gitea.io)
 repositories that reads from CHANGELOG and VERSION files. This is a clone of
 [github-release](https://github.com/github-release/github-release), but more
diff --git a/src/git.rs b/src/git.rs
new file mode 100644
index 0000000..ac8f7f2
--- /dev/null
+++ b/src/git.rs
@@ -0,0 +1,59 @@
+use anyhow::Result;
+use git2::Repository;
+use std::path::PathBuf;
+
+pub(crate) fn has_tag(repo_path: PathBuf, tag: String) -> Result<bool> {
+    let repo = Repository::init(repo_path)?;
+    let tags = repo.tag_names(Some(&tag))?;
+
+    for tag_obj in tags.iter() {
+        if tag_obj.is_none() {
+            continue;
+        }
+
+        let tag_name = tag_obj.unwrap();
+        if tag == tag_name.to_string() {
+            return Ok(true);
+        }
+    }
+
+    Ok(false)
+}
+
+#[cfg(test)]
+mod tests {
+    use anyhow::Result;
+    use git2::*;
+    use std::{fs::File, io::Write, path::Path};
+    use tempfile::tempdir;
+
+    #[test]
+    fn has_tag() -> Result<()> {
+        const TAG: &'static str = "0.1.0";
+        let dir = tempdir()?;
+        let repo = Repository::init(&dir)?;
+        let mut fout = File::create(&dir.path().join("VERSION"))?;
+        write!(fout, "{}", TAG)?;
+        drop(fout);
+        let mut index = repo.index()?;
+        index.add_path(Path::new("VERSION"))?;
+        let oid = index.write_tree()?;
+        let tree = repo.find_tree(oid)?;
+
+        let sig = Signature::now("Testificate", "test@ifica.te")?;
+        repo.commit(
+            Some("HEAD"),
+            &sig,
+            &sig,
+            "test commit please ignore",
+            &tree,
+            &[],
+        )?;
+
+        let obj = repo.revparse_single("HEAD")?;
+        repo.tag(TAG, &obj, &sig, &format!("version {}", TAG), false)?;
+        assert!(super::has_tag(dir.path().into(), TAG.into())?);
+
+        Ok(())
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 439ec64..7d141ec 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,6 +5,7 @@ use structopt::StructOpt;
 
 mod changelog;
 mod cmd;
+mod git;
 mod gitea;
 mod version;