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//! Option matchers.
use core::fmt::Debug;
use crate::error::MatchError;
use crate::expectation::Expectation;
impl<T: Debug> Expectation<Option<T>> {
/// Asserts the option is `Some`.
///
/// Use [`to_be_some_with`](Expectation::to_be_some_with) when you also
/// need to check the inner value.
///
/// # Errors
///
/// Returns [`MatchError`] if the value is `None` (or `Some` when negated).
///
/// ```text
/// expect!(result)
/// actual: None
/// expected: to be Some(_)
/// ```
///
/// # Examples
///
/// ```
/// use behave::Expectation;
///
/// let result = Expectation::new(Some(1), "Some(1)").to_be_some();
/// assert!(result.is_ok());
/// ```
pub fn to_be_some(&self) -> Result<(), MatchError> {
self.check(self.value().is_some(), "to be Some(_)")
}
/// Asserts the option is `None`.
///
/// # Errors
///
/// Returns [`MatchError`] if the value is `Some` (or `None` when negated).
///
/// # Examples
///
/// ```
/// use behave::Expectation;
///
/// let result = Expectation::new(None::<i32>, "None").to_be_none();
/// assert!(result.is_ok());
/// ```
pub fn to_be_none(&self) -> Result<(), MatchError> {
self.check(self.value().is_none(), "to be None")
}
}
impl<T: Debug> Expectation<Option<T>> {
/// Asserts the option is `Some` and the inner value satisfies a predicate.
///
/// The `desc` argument appears in failure messages (e.g. `"to be positive"`).
///
/// # Errors
///
/// Returns [`MatchError`] if the value is `None` or the predicate returns `false`.
///
/// ```text
/// expect!(opt)
/// actual: Some(0)
/// expected: to be Some(_) and to be positive
/// ```
///
/// # Examples
///
/// ```
/// use behave::Expectation;
///
/// let result = Expectation::new(Some(42), "x")
/// .to_be_some_and(|v| *v > 0, "to be positive");
/// assert!(result.is_ok());
/// ```
pub fn to_be_some_and(
&self,
predicate: impl FnOnce(&T) -> bool,
desc: &str,
) -> Result<(), MatchError> {
let is_match = self.value().as_ref().is_some_and(predicate);
self.check(is_match, format!("to be Some(_) and {desc}"))
}
}
impl<T: Debug + PartialEq> Expectation<Option<T>> {
/// Asserts the option is `Some` containing the expected value.
///
/// # Errors
///
/// Returns [`MatchError`] if the option is `None` or contains a different value.
///
/// # Examples
///
/// ```
/// use behave::Expectation;
///
/// let result = Expectation::new(Some(42), "Some(42)").to_be_some_with(42);
/// assert!(result.is_ok());
/// ```
#[allow(clippy::needless_pass_by_value)]
pub fn to_be_some_with(&self, expected: T) -> Result<(), MatchError> {
let is_match = self.value().as_ref() == Some(&expected);
self.check(is_match, format!("to be Some({expected:?})"))
}
}
#[cfg(test)]
mod tests {
use crate::Expectation;
#[test]
fn to_be_some_pass() {
assert!(Expectation::new(Some(1), "x").to_be_some().is_ok());
}
#[test]
fn to_be_some_fail() {
assert!(Expectation::new(None::<i32>, "x").to_be_some().is_err());
}
#[test]
fn to_be_some_negated_pass() {
assert!(Expectation::new(None::<i32>, "x")
.negate()
.to_be_some()
.is_ok());
}
#[test]
fn to_be_some_negated_fail() {
assert!(Expectation::new(Some(1), "x")
.negate()
.to_be_some()
.is_err());
}
#[test]
fn to_be_none_pass() {
assert!(Expectation::new(None::<i32>, "x").to_be_none().is_ok());
}
#[test]
fn to_be_none_fail() {
assert!(Expectation::new(Some(1), "x").to_be_none().is_err());
}
#[test]
fn to_be_none_negated_pass() {
assert!(Expectation::new(Some(1), "x").negate().to_be_none().is_ok());
}
#[test]
fn to_be_none_negated_fail() {
assert!(Expectation::new(None::<i32>, "x")
.negate()
.to_be_none()
.is_err());
}
#[test]
fn to_be_some_with_pass() {
assert!(Expectation::new(Some(42), "x").to_be_some_with(42).is_ok());
}
#[test]
fn to_be_some_with_wrong_value() {
assert!(Expectation::new(Some(42), "x").to_be_some_with(99).is_err());
}
#[test]
fn to_be_some_with_none() {
assert!(Expectation::new(None::<i32>, "x")
.to_be_some_with(42)
.is_err());
}
#[test]
fn to_be_some_with_negated_pass() {
assert!(Expectation::new(Some(42), "x")
.negate()
.to_be_some_with(99)
.is_ok());
}
#[test]
fn to_be_some_with_negated_fail() {
assert!(Expectation::new(Some(42), "x")
.negate()
.to_be_some_with(42)
.is_err());
}
// --- to_be_some_and ---
#[test]
fn to_be_some_and_pass() {
assert!(Expectation::new(Some(42), "x")
.to_be_some_and(|v| *v > 0, "to be positive")
.is_ok());
}
#[test]
fn to_be_some_and_fail_none() {
assert!(Expectation::new(None::<i32>, "x")
.to_be_some_and(|v| *v > 0, "to be positive")
.is_err());
}
#[test]
fn to_be_some_and_fail_predicate() {
assert!(Expectation::new(Some(-1), "x")
.to_be_some_and(|v| *v > 0, "to be positive")
.is_err());
}
#[test]
fn to_be_some_and_negated() {
assert!(Expectation::new(Some(-1), "x")
.negate()
.to_be_some_and(|v| *v > 0, "to be positive")
.is_ok());
}
}