json_diff 0.1.2

A small diff tool utility for comparing jsons
Documentation 
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pub mod constants;
pub mod ds;
mod process;
use constants::Message;
use ds::mismatch::Mismatch;

pub fn compare_jsons(a: &str, b: &str) -> Result<Mismatch, Message> {
    let value1 = match serde_json::from_str(a) {
        Ok(val1) => val1,
        Err(_) => return Err(Message::JSON1),
    };
    let value2 = match serde_json::from_str(b) {
        Ok(val2) => val2,
        Err(_) => return Err(Message::JSON2),
    };
    Ok(process::match_json(&value1, &value2))
}

#[cfg(test)]
mod tests {
    use super::ds::{key_node::KeyNode, mismatch::Mismatch};
    use super::*;
    use maplit::hashmap;
    use serde_json::json;

    #[test]
    fn nested_diff() {
        let data1 = r#"{
            "a":"b", 
            "b":{
                "c":{
                    "d":true,
                    "e":5,
                    "f":9,
                    "h":{
                        "i":true,
                        "j":false
                    }
                }
            }
        }"#;
        let data2 = r#"{
            "a":"b",
            "b":{
                "c":{
                    "d":true,
                    "e":6,
                    "g":0,
                    "h":{
                        "i":false,
                        "k":false
                    }
                }
            }
        }"#;

        let expected_left = KeyNode::Node(hashmap! {
        "b".to_string() => KeyNode::Node(hashmap! {
                "c".to_string() => KeyNode::Node(hashmap! {
                        "f".to_string() => KeyNode::Nil,
                        "h".to_string() => KeyNode::Node( hashmap! {
                                "j".to_string() => KeyNode::Nil,
                            }
                        ),
                }
                ),
            }),
        });
        let expected_right = KeyNode::Node(hashmap! {
            "b".to_string() => KeyNode::Node(hashmap! {
                    "c".to_string() => KeyNode::Node(hashmap! {
                            "g".to_string() => KeyNode::Nil,
                            "h".to_string() => KeyNode::Node(hashmap! {
                                    "k".to_string() => KeyNode::Nil,
                                }
                            )
                        }
                    )
                }
            )
        });
        let expected_uneq = KeyNode::Node(hashmap! {
            "b".to_string() => KeyNode::Node(hashmap! {
                    "c".to_string() => KeyNode::Node(hashmap! {
                            "e".to_string() => KeyNode::Value(json!(5), json!(6)),
                            "h".to_string() => KeyNode::Node(hashmap! {
                                    "i".to_string() => KeyNode::Value(json!(true), json!(false)),
                                }
                            )
                        }
                    )
                }
            )
        });
        let expected = Mismatch::new(expected_left, expected_right, expected_uneq);

        let mismatch = compare_jsons(data1, data2).unwrap();
        assert_eq!(mismatch, expected, "Diff was incorrect.");
    }

    #[test]
    fn no_diff() {
        let data1 = r#"{
            "a":"b", 
            "b":{
                "c":{
                    "d":true,
                    "e":5,
                    "f":9,
                    "h":{
                        "i":true,
                        "j":false
                    }
                }
            }
        }"#;
        let data2 = r#"{
            "a":"b", 
            "b":{
                "c":{
                    "d":true,
                    "e":5,
                    "f":9,
                    "h":{
                        "i":true,
                        "j":false
                    }
                }
            }
        }"#;

        assert_eq!(
            compare_jsons(data1, data2).unwrap(),
            Mismatch::new(KeyNode::Nil, KeyNode::Nil, KeyNode::Nil)
        );
    }

    #[test]
    fn no_json() {
        let data1 = r#"{}"#;
        let data2 = r#"{}"#;

        assert_eq!(
            compare_jsons(data1, data2).unwrap(),
            Mismatch::new(KeyNode::Nil, KeyNode::Nil, KeyNode::Nil)
        );
    }

    #[test]
    fn parse_err_source_one() {
        let invalid_json1 = r#"{invalid: json}"#;
        let valid_json2 = r#"{"a":"b"}"#;
        match compare_jsons(invalid_json1, valid_json2) {
            Ok(_) => panic!("This shouldn't be an Ok"),
            Err(err) => {
                assert_eq!(Message::JSON1, err);
            }
        };
    }

    #[test]
    fn parse_err_source_two() {
        let valid_json1 = r#"{"a":"b"}"#;
        let invalid_json2 = r#"{invalid: json}"#;
        match compare_jsons(valid_json1, invalid_json2) {
            Ok(_) => panic!("This shouldn't be an Ok"),
            Err(err) => {
                assert_eq!(Message::JSON2, err);
            }
        };
    }
}