feat: Improve error message on missing property

Author: barskern

src/error.rs

@@ -230,7 +230,7 @@ impl fmt::Display for ConfigError {
             ConfigError::Foreign(ref cause) => write!(f, "{cause}"),
 
             ConfigError::NotFound(ref key) => {
-                write!(f, "configuration property {key:?} not found")
+                write!(f, "missing configuration field {key:?}")
             }
 
             ConfigError::Type {

tests/testsuite/errors.rs

@@ -22,7 +22,7 @@ fn test_path_index_bounds() {
     assert!(res.is_err());
     assert_data_eq!(
         res.unwrap_err().to_string(),
-        str![[r#"configuration property "arr[2]" not found"#]]
+        str![[r#"missing configuration field "arr[2]""#]]
     );
 }
 
@@ -45,7 +45,7 @@ fn test_path_index_negative_bounds() {
     assert!(res.is_err());
     assert_data_eq!(
         res.unwrap_err().to_string(),
-        str![[r#"configuration property "arr[-1]" not found"#]]
+        str![[r#"missing configuration field "arr[-1]""#]]
     );
 }
 

tests/testsuite/get.rs

@@ -18,7 +18,7 @@ fn test_not_found() {
     assert!(res.is_err());
     assert_data_eq!(
         res.unwrap_err().to_string(),
-        str![[r#"configuration property "not_found" not found"#]]
+        str![[r#"missing configuration field "not_found""#]]
     );
 }