diff --git a/Cargo.toml b/Cargo.toml
index f6932b0..1c0b047 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,3 +10,6 @@ ureq = "2.10"
 kxio = "1.2"
 ignore = "0.4"
 bon = "2.3"
+
+[dev-dependencies]
+assert2 = "0.3"
diff --git a/src/main.rs b/src/main.rs
index 57fd966..2a9a380 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,6 +8,9 @@ mod model;
 mod patterns;
 mod scanner;
 
+#[cfg(test)]
+mod tests;
+
 fn main() -> Result<()> {
     println!("Forgejo TODO Checker!");
 
diff --git a/src/model/config.rs b/src/model/config.rs
index 605ad12..7c7be4f 100644
--- a/src/model/config.rs
+++ b/src/model/config.rs
@@ -4,7 +4,7 @@
 use bon::Builder;
 use regex::Regex;
 
-#[derive(Builder)]
+#[derive(Debug, Builder)]
 pub struct Config {
     fs: kxio::fs::FileSystem,
     repo: String,
diff --git a/src/tests/init.rs b/src/tests/init.rs
new file mode 100644
index 0000000..6cb0140
--- /dev/null
+++ b/src/tests/init.rs
@@ -0,0 +1,94 @@
+//
+use super::*;
+
+use assert2::let_assert;
+use model::Config;
+use patterns::{issue_pattern, marker_pattern};
+
+#[test]
+fn init_when_all_valid() -> anyhow::Result<()> {
+    //given
+    let fs = kxio::fs::temp()?;
+    std::env::set_var("GITHUB_WORKSPACE", fs.base());
+    std::env::set_var("GITHUB_REPOSITORY", "repo");
+    std::env::set_var("GITHUB_SERVER_URL", "server");
+    let expected = Config::builder()
+        .fs(kxio::fs::new(fs.base().to_path_buf()))
+        .repo("repo".to_string())
+        .server("server".to_string())
+        .prefix_pattern(marker_pattern()?)
+        .issue_pattern(issue_pattern()?)
+        .maybe_auth_token(Some("auth".to_string()))
+        .build();
+
+    //when
+    let result = init_config()?;
+
+    //then
+    assert_eq!(result.fs().base(), expected.fs().base());
+    assert_eq!(result.repo(), expected.repo());
+    // assert_eq!(result.server(), expected.server());
+    assert_eq!(
+        result.prefix_pattern().to_string(),
+        expected.prefix_pattern().to_string()
+    );
+    assert_eq!(
+        result.issue_pattern().to_string(),
+        expected.issue_pattern().to_string()
+    );
+
+    Ok(())
+}
+
+#[test]
+fn init_when_no_workspace() -> anyhow::Result<()> {
+    //given
+    std::env::remove_var("GITHUB_WORKSPACE");
+    std::env::set_var("GITHUB_REPOSITORY", "repo");
+    std::env::set_var("GITHUB_SERVER_URL", "server");
+
+    //when
+    let result = init_config();
+
+    //then
+    let_assert!(Err(e) = result);
+    assert_eq!(e.to_string(), "GITHUB_WORKSPACE");
+
+    Ok(())
+}
+
+#[test]
+fn init_when_no_repository() -> anyhow::Result<()> {
+    //given
+    let fs = kxio::fs::temp()?;
+    std::env::set_var("GITHUB_WORKSPACE", fs.base());
+    std::env::remove_var("GITHUB_REPOSITORY");
+    std::env::set_var("GITHUB_SERVER_URL", "server");
+
+    //when
+    let result = init_config();
+
+    //then
+    let_assert!(Err(e) = result);
+    assert_eq!(e.to_string(), "GITHUB_REPOSITORY");
+
+    Ok(())
+}
+
+#[test]
+fn init_when_no_server_url() -> anyhow::Result<()> {
+    //given
+    let fs = kxio::fs::temp()?;
+    std::env::set_var("GITHUB_WORKSPACE", fs.base());
+    std::env::set_var("GITHUB_REPOSITORY", "repo");
+    std::env::remove_var("GITHUB_SERVER_URL");
+
+    //when
+    let result = init_config();
+
+    //then
+    let_assert!(Err(e) = result);
+    assert_eq!(e.to_string(), "GITHUB_SERVER_URL");
+
+    Ok(())
+}
diff --git a/src/tests/mod.rs b/src/tests/mod.rs
new file mode 100644
index 0000000..2af0c17
--- /dev/null
+++ b/src/tests/mod.rs
@@ -0,0 +1,4 @@
+//
+use super::*;
+
+mod init;