Test properties updated

rustlings-macros/info.toml

@@ -1206,6 +1206,7 @@ Add `AsRef<str>` or `AsMut<u32>` as a trait bound to the functions."""
 [[exercises]]
 name = "file_io1"
 dir = "24_file_io"
+test = false
 hint = """
 Basic File Reading
 """
@@ -1213,6 +1214,7 @@ Basic File Reading
 [[exercises]]
 name = "file_io2"
 dir = "24_file_io"
+test = false
 hint = """
 Buffered Reading & Writing
 """
@@ -1220,6 +1222,7 @@ Buffered Reading & Writing
 [[exercises]]
 name = "file_io3"
 dir = "24_file_io"
+test = false
 hint = """
 Path Manipulation & Metadata
 """

solutions/24_file_io/file_io1.rs

@@ -14,3 +14,22 @@ fn main() {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_working_directory() {
+        let working_directory_result = std::path::Path::new(".").canonicalize();
+
+        match working_directory_result {
+            Ok(working_directory) => {
+                println!("The working directory is {:?}", working_directory);
+            }
+            Err(error) => {
+                println!("Error: {:?}", error);
+            }
+        }
+    }
+}