Generate tests from json files

[la10736]

Generate tests from json files

[la10736]

• align to master (relative path)
• use SysEngine in files_arg too and rewrite tests to use mockall
• use relative path in files
• implement render
• E2E tests
• Docs
• ? syntax for json_path ?

[la10736]

The proposed rendering is just wrong 😢 . In order to avoid modules name duplication every rendering should start with the function name. So, in the previous described case we'll have something like the the following expanded code (some details are omitted):

mod age_is_greater_eq_than_18 {
    use super::*;
    #[derive(Deserialize)]
    struct __JsonObjDeserialized {
        age: u16
    }
    mod resources {
        use super::*;
        mod tests {
            use super::*;
            mod people_json {
                use super::*;
                #[test]
                fn data_1() {build 
                        let __JsonObjDeserialized {
                            age
                        } = serde_json::from_str(#"{
                                  "name": "John Doe",
                                  "age": 23
                              }"#
                        ).expect(#"I cannot deserialize '"{
                                  "name": "John Doe",
                                  "age": 23
                              }"' to extract fields"#);
                       assert!(age>=18);
                }

                #[test]
                fn data_2() {build 
                        let __JsonObjDeserialized {
                            age
                        } = serde_json::from_str(#"{
                                  "name": "Andy Brown",
                                  "age": 45
                              }"#
                        ).expect(#"I cannot deserialize '"{
                                   "name": "Andy Brown",
                                   "age": 45
                              }"' to extract fields"#);
                       assert!(age>=18);
                }
            }
        }
    }
}

mod use_remap {
    use super::*;
    #[derive(Deserialize)]
    struct __JsonObjDeserialized {
        #[serde(rename = "age")]
        a: u16
    }
    /// Rest of the code is like the previous case where use `a` instead of `age` in the test
}

mod use_remap_from_serde {
    /// The same code like in `use_remap`
}

mod use_object {
    mod resources {
        use super::*;
        mod tests {
            use super::*;
            mod people_json {
                use super::*;
                #[test]
                fn data_1() {build 
                        let user = serde_json::from_str(#"{
                                  "name": "John Doe",
                                  "age": 23
                              }"#
                        ).expect(#"I cannot deserialize '"{
                                  "name": "John Doe",
                                  "age": 23
                              }"'"#);
                       assert!(user.age>=18);
                }

                #[test]
                fn data_2() {build 
                        let user = serde_json::from_str(#"{
                                  "name": "Andy Brown",
                                  "age": 45
                              }"#
                        ).expect(#"I cannot deserialize '"{
                                   "name": "Andy Brown",
                                   "age": 45
                              }"'"#);
                       assert!(user.age>=18);
                }
            }
        }
    }
}