6 releases
0.2.0 | Aug 9, 2023 |
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0.1.4 | Jul 23, 2023 |
0.1.3 | Jun 24, 2023 |
#969 in Procedural macros
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FluentFieldAssertions
FluentFieldAssertions is a library that allows you to write tests in a natural language-like syntax.
With this library, you can perform field assertions in an intuitive and readable way.
Features
- Natural Language Syntax: You can write test code in a syntax that closely resembles natural language.
- Method Chaining: You can chain assertions as method calls, allowing you to express multiple assertions in a single statement.
- Readability and Maintainability: The code becomes simple and readable, improving the maintainability of your tests.
Uses
FluentFieldAssertions generated the following methods for each field.
fn {field}_eq(&self, expected: {field_type}) -> &Self
- Asserts that the field is equal to the expected value.
fn {field}_ne(&self, expected: {field_type}) -> &Self
- Asserts that the field is not equal to the expected value.
fn {field}_satisfies(&self, pred: impl FnOnce(&{field_type}) -> bool) -> &Self
- Asserts that the field satisfies the predicate.
use fluent_field_assertions::FluentFieldAssertions;
#[derive(FluentFieldAssertions)]
struct User {
id: usize,
name: String,
age: usize,
}
let user = User {
id: 1,
name: "Alice".to_string(),
age: 17,
};
// You can write tests in a natural language-like syntax.
user.id_eq(&1)
.name_eq(&"Alice".to_string())
.age_satisfies(|age| age < &18);
// Same as above.
assert_eq!(user.id, 1);
assert_eq!(user.name, "Alice".to_string());
assert!(user.age < 18);
Examples
Basic struct
You can use it in the basic struct.
Each field must implement the traits Eq
and Debug
.
use fluent_field_assertions::FluentFieldAssertions;
#[derive(FluentFieldAssertions)]
struct User {
id: usize,
name: String,
age: usize,
// You can skip assertion_methods for some fields.
#[assertions(skip)]
score: f64,
}
let user = User {
id: 1,
name: "Alice".to_string(),
age: 17,
score: 95.0,
};
// You can use `{field}_eq` to assert_eq!.
user.name_eq(&"Alice".to_string());
assert_eq!(user.name, "Alice".to_string()); // Same as above.
// You can use `{field}_ne` to assert_ne!.
user.name_ne(&"Bob".to_string());
assert_ne!(user.name, "Bob".to_string()); // Same as above.
// You can use `{field}_satisfies` to assert!.
user.name_satisfies(|name| name.starts_with('A'));
assert!(user.name.starts_with('A')); // Same as above.
// You can chain assertions as method calls.
user.id_eq(&1)
.name_eq(&"Alice".to_string())
.age_satisfies(|age| age < &18);
// Same as above.
assert_eq!(user.id, 1);
assert_eq!(user.name, "Alice".to_string());
assert!(user.age < 18);
Generic struct
You can also use it in the generic struct.
In that case, Generics type T
must implement the traits Eq
and Debug
.
use core::fmt::Debug;
use fluent_field_assertions::FluentFieldAssertions;
#[derive(FluentFieldAssertions)]
struct Point<T>
// Generics type `T` must implement trait `Eq` and `Debug`.
where
T: Eq + Debug,
{
x: T,
y: T,
z: T,
// You can skip assertion_methods for some fields.
#[assertions(skip)]
#[allow(dead_code)]
t: T,
}
let point = Point {
x: 1,
y: 2,
z: 3,
t: 4,
};
point.x_eq(&1).y_ne(&9).z_satisfies(|z| z % 3 == 0);
Dependencies
~295–760KB
~17K SLoC