Implement test_logger

Author: eyuuab

metta-run/tests/integration_test.rs

@@ -80,3 +80,50 @@ fn test_guard_set_formatter() {
         let expected_output = "[(TreeNode (Value Nil False OR)\n└──GuardSets's\n    ├─(TreeNode (Value B True LITERAL)\n    ├─(TreeNode (Value D True LITERAL)\n    ├─(TreeNode (Value E False LITERAL)\n";
     assert_eq!(String::from_utf8_lossy(&output.stdout), expected_output);
 }
+/// test logger functions
+#[test]
+fn test_logger() {
+    use std::fs::File;
+    use std::io::Read;
+    use core::panic;
+    use std::{io::BufRead, process::Command};
+    use chrono::Local;
+
+    let now = Local::now();
+
+    let log_file = format!(
+        "{}/metta-bin/{}.log",
+        std::env::var("HOME").unwrap(),
+        chrono::Local::now().format("%Y-%m-%d").to_string()
+    );
+
+    let output = Command::new("cargo")
+        .arg("run")
+        .arg("--")
+        .arg("tests/resources/metta_run.metta")
+        .output()
+        .expect("failed to execute process")
+        .stdout
+        .lines()
+        .last()
+        .unwrap();
+
+    let metta_output = match output {
+        Ok(output) => output.to_string(),
+        Err(_) => panic!("Error reading output"),
+    };
+
+    let expected_output = vec![
+        metta_output,
+        format!("Start time: {}", now.format("%Y-%m-%d %H-%m").to_string()),
+    ];
+
+    let mut file = File::open(&log_file).unwrap();
+    let mut contents = String::new();
+    file.read_to_string(&mut contents).unwrap();
+
+    let last_three_lines = contents.lines().rev().take(3).collect::<Vec<&str>>();
+    let output = vec![last_three_lines[0], &last_three_lines[2][..28]];
+
+    assert_eq!(output, expected_output);
+}