Test for the array-Value roundtrip failure (ron-rs#404)

tests/238_array.rs

@@ -0,0 +1,51 @@
+use ron::{
+    error::{Error, Position, SpannedError},
+    value::{Number, Value},
+};
+
+#[test]
+fn test_array() {
+    let array: [i32; 3] = [1, 2, 3];
+
+    let ser = ron::to_string(&array).unwrap();
+    assert_eq!(ser, "(1,2,3)");
+
+    let de: [i32; 3] = ron::from_str(&ser).unwrap();
+    assert_eq!(de, array);
+
+    let value: Value = ron::from_str(&ser).unwrap();
+    assert_eq!(
+        value,
+        Value::Seq(vec![
+            Value::Number(Number::from(1)),
+            Value::Number(Number::from(2)),
+            Value::Number(Number::from(3)),
+        ])
+    );
+
+    let ser = ron::to_string(&value).unwrap();
+    assert_eq!(ser, "[1,2,3]");
+
+    let de: [i32; 3] = value.into_rust().unwrap();
+    assert_eq!(de, array);
+
+    // FIXME: fails and hence arrays do not roundtrip
+    let de: SpannedError = ron::from_str::<[i32; 3]>(&ser).unwrap_err();
+    assert_eq!(
+        de,
+        SpannedError {
+            code: Error::ExpectedStructLike,
+            position: Position { line: 1, col: 1 },
+        }
+    );
+
+    let value: Value = ron::from_str(&ser).unwrap();
+    assert_eq!(
+        value,
+        Value::Seq(vec![
+            Value::Number(Number::from(1)),
+            Value::Number(Number::from(2)),
+            Value::Number(Number::from(3)),
+        ])
+    );
+}