use rstest

Cargo.toml

@@ -33,3 +33,5 @@ darling = "0.20"
 [dev-dependencies]
 miniconf = { version = "0.13", features = ["json-core"] }
 serde = "1.0"
+rstest = "0.22"
+serde-json-core = "0.5.1"

tests/simple.rs

@@ -7,6 +7,7 @@ use miniconf::{
     Traversal::{Access, TooLong},
     Tree, TreeKey,
 };
+use rstest::*;
 use serde::{Deserialize, Serialize};
 
 #[config]
@@ -30,27 +31,39 @@ struct Config {
     sub_config: SubConfig,
 }
 
-#[test]
-fn keys() {
-    for (id, field) in ["skipped", "min", "max", "default", "description"]
-        .into_iter()
-        .enumerate()
-    {
-        assert_eq!(
-            SubConfig::traverse_by_key([field].into_keys(), |index, name, _len| {
-                assert_eq!((id, Some(field)), (index, name));
-                Ok::<_, ()>(())
-            }),
-            Ok(1)
-        );
-    }
+#[rstest]
+#[case(0, ["skipped"])]
+#[case(1, ["min"])]
+#[case(2, ["max"])]
+#[case(3, ["default"])]
+#[case(4, ["description"])]
+fn key<const N: usize>(#[case] id: usize, #[case] field: [&str; N]) {
+    assert_eq!(
+        SubConfig::traverse_by_key(field.into_keys(), |index, name, _len| {
+            assert_eq!((id, Some(field[field.len() - 1])), (index, name));
+            Ok::<_, ()>(())
+        }),
+        Ok(1)
+    );
 }
 
-#[test]
-fn sub_keys() {
+#[rstest]
+#[case(["skipped", "value"], Err(Traversal(TooLong(1))))]
+#[case(["min", "value"], Ok(2))]
+#[case(["max", "value"], Ok(2))]
+#[case(["default", "value"], Ok(2))]
+#[case(["description", "value"], Ok(2))]
+#[case(["min", "min"], Ok(2))]
+#[case(["max", "max"], Ok(2))]
+#[case(["default", "default"], Ok(2))]
+#[case(["description", "description"], Ok(2))]
+fn sub_keys<const N: usize>(
+    #[case] fields: [&str; N],
+    #[case] expected: Result<usize, miniconf::Error<()>>,
+) {
     assert_eq!(
-        SubConfig::traverse_by_key(["skipped", "value"].into_keys(), |_, _, _| Ok::<_, ()>(())),
-        Err(Traversal(TooLong(1)))
+        SubConfig::traverse_by_key(fields.into_keys(), |_, _, _| Ok::<_, ()>(())),
+        expected
     );
     assert_eq!(
         SubConfig::traverse_by_key(["skipped"].into_keys(), |_, _, _| Ok::<_, ()>(())),
@@ -68,39 +81,59 @@ fn sub_keys() {
     }
 }
 
-#[test]
-fn serialize() {
-    let mut buffer = [0u8; 32];
-    let config = SubConfig {
+#[fixture]
+#[once]
+fn sub_config() -> SubConfig {
+    SubConfig {
         skipped: 1,
         min: __SubConfigMin::new(2),
         max: __SubConfigMax::new(3),
         default: __SubConfigDefault::new(4),
         description: __SubConfigDescription::new(5),
-    };
-
-    for (input, output) in [
-        ("/skipped", "1"),
-        ("/min", "2"),
-        ("/min/value", "2"),
-        ("/min/min", "-2147483648"),
-        ("/max", "3"),
-        ("/max/value", "3"),
-        ("/max/max", "2147483647"),
-        ("/default", "4"),
-        ("/default/value", "4"),
-        ("/default/default", "0"),
-        ("/description", "5"),
-        ("/description/value", "5"),
-        ("/description/description", "\"This is a description\""),
-    ] {
-        let len = config.get_json(input, &mut buffer).unwrap();
-        assert_eq!(from_utf8(&buffer[..len]), Ok(output));
     }
 }
 
-#[test]
-fn deserialize() {
+#[rstest]
+#[case("/skipped", "1")]
+#[case("/min", "2")]
+#[case("/min/value", "2")]
+#[case("/min/min", "-2147483648")]
+#[case("/max", "3")]
+#[case("/max/value", "3")]
+#[case("/max/max", "2147483647")]
+#[case("/default", "4")]
+#[case("/default/value", "4")]
+#[case("/default/default", "0")]
+#[case("/description", "5")]
+#[case("/description/value", "5")]
+#[case("/description/description", "\"This is a description\"")]
+fn serialize(sub_config: &SubConfig, #[case] path: &str, #[case] expected: &str) {
+    let mut buffer = [0u8; 32];
+    let len = sub_config.get_json(path, &mut buffer).unwrap();
+    assert_eq!(from_utf8(&buffer[..len]), Ok(expected));
+}
+
+#[rstest]
+#[case("/skipped", Ok(2))]
+#[case("/min", Ok(2))]
+#[case("/min/value", Ok(2))]
+#[case("/max", Ok(2))]
+#[case("/max/value", Ok(2))]
+#[case("/default", Ok(2))]
+#[case("/default/value", Ok(2))]
+#[case("/description", Ok(2))]
+#[case("/description/value", Ok(2))]
+#[case("/min/min", Err(Traversal(Access(1, "Cannot write limits"))))]
+#[case("/max/max", Err(Traversal(Access(1, "Cannot write limits"))))]
+#[case("/default/default", Err(Traversal(Access(1, "Cannot write limits"))))]
+#[case(
+    "/description/description",
+    Err(Traversal(Access(1, "Cannot write limits")))
+)]
+fn deserialize(
+    #[case] path: &str,
+    #[case] expected: Result<usize, miniconf::Error<serde_json_core::de::Error>>,
+) {
     let mut config = SubConfig {
         skipped: 0,
         min: __SubConfigMin::new(0),
@@ -109,34 +142,12 @@ fn deserialize() {
         description: __SubConfigDescription::new(0),
     };
 
-    for input in [
-        "/skipped",
-        "/min",
-        "/min/value",
-        "/max",
-        "/max/value",
-        "/default",
-        "/default/value",
-        "/description",
-        "/description/value",
-    ] {
-        let res = config.set_json(input, b"10");
-        assert_eq!(res, Ok(2));
-    }
-
-    for input in [
-        "/min/min",
-        "/max/max",
-        "/default/default",
-        "/description/description",
-    ] {
-        let res = config.set_json(input, b"10");
-        assert_eq!(res, Err(Traversal(Access(1, "Cannot write limits"))));
-    }
+    let res = config.set_json(path, b"10");
+    assert_eq!(res, expected);
 }
 
 #[test]
-fn subconfig() {
+fn config_paths() {
     let control = vec![
         "/sub_config/skipped".to_owned(),
         "/sub_config/min/value".to_owned(),