Add testcase for lowercase log::Level deserialization

Signed-off-by: Matthias Beyer <[email protected]>

Author: matthiasbeyer

tests/log.rs

@@ -3,6 +3,7 @@ extern crate log;
 
 #[macro_use]
 extern crate serde_derive;
+extern crate serde_json;
 
 use config::*;
 
@@ -26,3 +27,26 @@ fn test_load_level_uppercase() {
     assert_eq!(l, log::Level::Error);
 }
 
+#[test]
+fn test_load_level_lowercase() {
+    // to verify that this works
+    {
+        use std::str::FromStr;
+        let l = log::Level::from_str("error").unwrap();
+        assert_eq!(l, log::Level::Error);
+    }
+
+    let s = r#"{ "log": "error" }"#;
+
+    // to confirm serde_json works as expected
+    {
+        let j: Settings = serde_json::from_str(s).unwrap();
+        assert_eq!(j.log, log::Level::Error);
+    }
+
+    let c = config(s);
+    assert_eq!(c.get_str("log").unwrap(), "error");
+    let l = c.get::<log::Level>("log");
+    assert!(l.is_ok(), "Expected Ok(_) for {:?}", l);
+    assert_eq!(l.unwrap(), log::Level::Error);
+}