test(cli): add tests

crates/cli/src/init.rs

@@ -1,14 +1,10 @@
-use std::path::PathBuf;
-
 use kxio::fs::FileSystem;
 
 pub fn run(fs: FileSystem) {
     let file_name = ".git-next.toml";
-    let pathbuf = PathBuf::from(file_name);
-    let Ok(exists) = fs.path_exists(&pathbuf) else {
-        eprintln!("Could not check if file exist: {}", file_name);
-        return;
-    };
+    let pathbuf = fs.base().join(file_name);
+    match fs.path_exists(&pathbuf) {
+        Ok(exists) => {
             if exists {
                 eprintln!(
                     "The configuration file already exists at {} - not overwritting it.",
@@ -24,4 +20,9 @@ pub fn run(fs: FileSystem) {
                     }
                 }
             }
+        }
+        Err(err) => {
+            eprintln!("Could not check if file exist: {} - {err:?}", file_name);
+        }
+    }
 }

crates/cli/src/main.rs

@@ -1,5 +1,8 @@
 mod init;
 
+#[cfg(test)]
+mod tests;
+
 use std::path::PathBuf;
 
 use clap::Parser;

crates/cli/src/tests.rs

@@ -0,0 +1,40 @@
+type TestResult = Result<(), Box<dyn std::error::Error>>;
+
+mod init {
+    use super::*;
+    #[test]
+    fn should_not_update_file_if_it_exists() -> TestResult {
+        let fs = kxio::fs::temp()?;
+        let file = fs.base().join(".git-next.toml");
+        fs.file_write(&file, "contents")?;
+
+        crate::init::run(fs.clone());
+
+        assert_eq!(
+            fs.file_read_to_string(&file)?,
+            "contents",
+            "The file has been changed"
+        );
+
+        Ok(())
+    }
+
+    #[test]
+    fn should_create_default_file_if_not_exists() -> TestResult {
+        let fs = kxio::fs::temp()?;
+
+        crate::init::run(fs.clone());
+
+        let file = fs.base().join(".git-next.toml");
+
+        assert!(fs.path_exists(&file)?, "The file has not been created");
+
+        assert_eq!(
+            fs.file_read_to_string(&file)?,
+            include_str!("../../../default.toml"),
+            "The file does not match the default template"
+        );
+
+        Ok(())
+    }
+}