Merge #197

197: Testing for RON files r=kvark a=peter-scholtens

As a solution to the proposed test as mentioned in #192 I created a two functions: read_original()  and test_sequence(). Using an assert equal macro various files can be tested. Two examples are given: the first one fails as the mapping sequence changes, the secvond one is correct, as the map only contains one item.

Co-authored-by: Peter C. S. Scholtens <peter.scholtens@xs4all.nl>

tests/preserve_sequence.rs

@@ -0,0 +1,61 @@
+use ron::ser::{to_string_pretty, PrettyConfig};
+use ron::de::from_str;
+use serde::Deserialize;
+use serde::Serialize;
+use std::{collections::HashMap, fs::File};
+use std::env;
+use std::fs;
+
+#[derive(Debug, Deserialize, Serialize)]
+struct Config {
+    boolean: bool,
+    float: f32,
+    map: HashMap<u8, char>,
+    nested: Nested,
+    tuple: (u32, u32),
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+struct Nested {
+    a: String,
+    b: char,
+}
+
+fn read_original(source: &str) -> (String) {
+    source.to_string()
+}
+
+fn make_roundtrip(source: &str) -> (String) {
+    let config: Config = match from_str(source) {
+        Ok(x) => x,
+        Err(e) => {
+            println!("Failed to load config: {}", e);
+            std::process::exit(1);
+        }
+    };
+    let pretty = PrettyConfig::new()
+        .with_depth_limit(3)
+        .with_separate_tuple_members(true)
+        .with_enumerate_arrays(true);
+    to_string_pretty(&config, pretty).expect("Serialization failed")
+}
+
+#[test]
+fn test_sequence_ex1()
+{
+    let file = include_str!("preserve_sequence_ex1.ron");
+    assert_eq!(
+        read_original(file),
+        make_roundtrip(file)
+    );
+}
+
+#[test]
+fn test_sequence_ex2()
+{
+    let file = include_str!("preserve_sequence_ex2.ron");
+    assert_eq!(
+        read_original(file),
+        make_roundtrip(file)
+    );
+}

tests/preserve_sequence_ex1.ron

@@ -0,0 +1,20 @@
+(
+    boolean: true,
+    float: 8.2,
+    map: {
+        1: '1',
+        2: '4',
+        3: '9',
+        4: '1',
+        5: '2',
+        6: '3',
+    },
+    nested: (
+        a: "Decode me!",
+        b: 'z',
+    ),
+    tuple: (
+        3,
+        7,
+    ),
+)

tests/preserve_sequence_ex2.ron

@@ -0,0 +1,15 @@
+(
+    boolean: true,
+    float: 8.2,
+    map: {
+        1: '1',
+    },
+    nested: (
+        a: "Decode me!",
+        b: 'z',
+    ),
+    tuple: (
+        3,
+        7,
+    ),
+)