Add unit test to command module

src/command.rs

@@ -84,4 +84,29 @@ impl Display for ExecutionError {
   }
 }
 
-impl Error for ExecutionError {}
+impl Error for ExecutionError {}
+
+#[cfg(test)]
+mod test {
+  use crate::command::{ExecutionError, LogRunnable, SpecificExecutionError};
+  use crate::logger::Logger;
+  use std::process::Command;
+
+  #[test]
+  fn test_unknown_command() {
+    let mut command = Command::new("a_command_which_def_doesnt_exist");
+    let Err(
+      e @ SpecificExecutionError {
+        error: ExecutionError::StartError(_),
+        ..
+      },
+    ) = command.args(["foo", "bar"]).run(&Logger::default())
+    else {
+      panic!("command shouldn't exist");
+    };
+    println!("{e}");
+  }
+
+  #[test]
+  fn test_error() {}
+}