Create TestLogger.

diff --git a/src/types.rs b/src/types.rs
index 0b03081f35814eda15182f110bcf96cbf9cc6993..3e3d8c3317a2d622dd344dbab133449d05c54d62 100644 (file)
--- a/src/types.rs
+++ b/src/types.rs
@@ -36,3 +36,55 @@ impl Logger for RGSSLogger {
                println!("{:<5} [{} : {}, {}] {}", record.level.to_string(), record.module_path, record.file, record.line, record.args);
        }
 }
+
+#[cfg(test)]
+pub mod tests {
+       use std::collections::HashMap;
+       use std::sync::{Mutex};
+       use lightning::util::logger::{Level, Logger, Record};
+
+       pub struct TestLogger {
+               level: Level,
+               pub(crate) id: String,
+               pub lines: Mutex<HashMap<(String, String), usize>>,
+       }
+
+       impl TestLogger {
+               pub fn new() -> TestLogger {
+                       Self::with_id("".to_owned())
+               }
+               pub fn with_id(id: String) -> TestLogger {
+                       TestLogger {
+                               level: Level::Gossip,
+                               id,
+                               lines: Mutex::new(HashMap::new()),
+                       }
+               }
+               pub fn enable(&mut self, level: Level) {
+                       self.level = level;
+               }
+               pub fn assert_log(&self, module: String, line: String, count: usize) {
+                       let log_entries = self.lines.lock().unwrap();
+                       assert_eq!(log_entries.get(&(module, line)), Some(&count));
+               }
+
+               /// Search for the number of occurrence of the logged lines which
+               /// 1. belongs to the specified module and
+               /// 2. contains `line` in it.
+               /// And asserts if the number of occurrences is the same with the given `count`
+               pub fn assert_log_contains(&self, module: &str, line: &str, count: usize) {
+                       let log_entries = self.lines.lock().unwrap();
+                       let l: usize = log_entries.iter().filter(|&(&(ref m, ref l), _c)| {
+                               m == module && l.contains(line)
+                       }).map(|(_, c)| { c }).sum();
+                       assert_eq!(l, count)
+               }
+       }
+
+       impl Logger for TestLogger {
+               fn log(&self, record: &Record) {
+                       *self.lines.lock().unwrap().entry((record.module_path.to_string(), format!("{}", record.args))).or_insert(0) += 1;
+                       println!("{:<5} {} [{} : {}, {}] {}", record.level.to_string(), self.id, record.module_path, record.file, record.line, record.args);
+               }
+       }
+}