Function assert_that 

pub fn assert_that<'a, S>(subject: S) -> Spec<'a, S, PanicOnFail>

Starts an assertion for the given subject or expression in the PanicOnFail mode.

It wraps the subject into a Spec. On the Spec any assertion method that is implemented for the subject’s type can be called.

Assertions started with assert_that() will panic on the first failing assertion.

In comparison to using the macro assert_that! calling this function does not set a name for the expression and does not set the code location of the assertion. In failure messages, the generic word “subject” is used. To set a specific text for the expression, the method named must be called explicitly.

Note: It is not necessary to set the code location explicitly as this function is annotated with #[track_caller].

Examples

use asserting::prelude::*;

assert_that(7 * 6).is_equal_to(42);

or with setting a name for the expression:

use asserting::prelude::*;

assert_that(7 * 6)
    .named("7 * 6")
    .is_equal_to(42);