Macro assertables::assert_contains
source · macro_rules! assert_contains { ($container:expr, $containee:expr $(,)?) => { ... }; ($container:expr, $containee:expr, $($message:tt)+) => { ... }; }
Expand description
Assert a container is a match for an expression.
Pseudocode:
a.contains(b)
-
If true, return
()
. -
Otherwise, call
panic!
with a message and the values of the expressions with their debug representations.
§Examples
// Return Ok when a string contains a substring
let a = "alfa";
let b = "lf";
assert_contains!(a, b);
// Return Ok when a range contains a value
let a = 1..5;
let b = 2;
assert_contains!(a, &b);
let a = "alfa";
let b = "zz";
assert_contains!(a, b);
// assertion failed: `assert_contains!(container, containee)`
// https://docs.rs/assertables/8.7.0/assertables/macro.assert_contains.html
// container label: `a`,
// container debug: `\"alfa\"`,
// containee label: `b`,
// containee debug: `\"zz\"`