Macro pat 

macro_rules! pat {
    ({ $($key:literal : $val:expr),* $(,)? }) => { ... };
    ({ $($key:literal : $val:expr),* , .. }) => { ... };
}

Matches a JSON object by specifying a pattern of key-value matchers, similar to GoogleTest’s matches_pattern! macro for Rust structs.

This macro is used for asserting that a serde_json::Value representing a JSON object contains the specified fields, with each field matching the corresponding matcher. Extra fields are rejected unless the pattern ends with ...

Examples

Basic usage:

let value = json!({ "name": "Alice", "age": 30 });
assert_that!(
    value,
    json::pat!({
        "name": eq("Alice"),
        "age": ge(29),
        .. // allows additional fields
    })
);

Nested matching:

let value = json!({
    "user": {
        "id": 1,
        "active": true
    }
});
assert_that!(
    value,
    json::pat!({
        "user": json::pat!({
            "id": eq(1),
            "active": is_true(),
        })
    })
);

Alias

This macro is reexported as json::pat!.