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//! Count assertions for locators.
//!
//! This module contains assertions for checking the count of elements
//! matched by a locator.
use std::time::Duration;
use viewpoint_core::Locator;
use crate::error::AssertionError;
/// Count assertion methods for locators.
///
/// These methods are implemented separately and called via `LocatorAssertions`.
pub struct CountAssertions<'a> {
locator: &'a Locator<'a>,
timeout: Duration,
is_negated: bool,
}
impl<'a> CountAssertions<'a> {
/// Create a new `CountAssertions`.
pub fn new(locator: &'a Locator<'a>, timeout: Duration, is_negated: bool) -> Self {
Self {
locator,
timeout,
is_negated,
}
}
/// Assert that the element has the specified count.
///
/// # Errors
///
/// Returns an error if the assertion fails or the elements cannot be counted.
pub async fn to_have_count(&self, expected: usize) -> Result<(), AssertionError> {
let start = std::time::Instant::now();
loop {
let actual = self.locator.count().await.map_err(|e| {
AssertionError::new(
"Failed to count elements",
expected.to_string(),
e.to_string(),
)
})?;
let matches = actual == expected;
let expected_match = !self.is_negated;
if matches == expected_match {
return Ok(());
}
if start.elapsed() >= self.timeout {
return Err(AssertionError::new(
if self.is_negated {
format!("Element count should not be {expected}")
} else {
format!("Element count should be {expected}")
},
expected.to_string(),
actual.to_string(),
));
}
tokio::time::sleep(Duration::from_millis(100)).await;
}
}
/// Assert that the element count is greater than a value.
///
/// # Errors
///
/// Returns an error if the assertion fails or the elements cannot be counted.
pub async fn to_have_count_greater_than(&self, n: usize) -> Result<(), AssertionError> {
let start = std::time::Instant::now();
loop {
let actual = self.locator.count().await.map_err(|e| {
AssertionError::new("Failed to count elements", format!("> {n}"), e.to_string())
})?;
let matches = actual > n;
let expected_match = !self.is_negated;
if matches == expected_match {
return Ok(());
}
if start.elapsed() >= self.timeout {
return Err(AssertionError::new(
if self.is_negated {
format!("Element count should not be greater than {n}")
} else {
format!("Element count should be greater than {n}")
},
format!("> {n}"),
actual.to_string(),
));
}
tokio::time::sleep(Duration::from_millis(100)).await;
}
}
/// Assert that the element count is less than a value.
///
/// # Errors
///
/// Returns an error if the assertion fails or the elements cannot be counted.
pub async fn to_have_count_less_than(&self, n: usize) -> Result<(), AssertionError> {
let start = std::time::Instant::now();
loop {
let actual = self.locator.count().await.map_err(|e| {
AssertionError::new("Failed to count elements", format!("< {n}"), e.to_string())
})?;
let matches = actual < n;
let expected_match = !self.is_negated;
if matches == expected_match {
return Ok(());
}
if start.elapsed() >= self.timeout {
return Err(AssertionError::new(
if self.is_negated {
format!("Element count should not be less than {n}")
} else {
format!("Element count should be less than {n}")
},
format!("< {n}"),
actual.to_string(),
));
}
tokio::time::sleep(Duration::from_millis(100)).await;
}
}
/// Assert that the element count is at least a value (greater than or equal).
///
/// # Errors
///
/// Returns an error if the assertion fails or the elements cannot be counted.
pub async fn to_have_count_at_least(&self, n: usize) -> Result<(), AssertionError> {
let start = std::time::Instant::now();
loop {
let actual = self.locator.count().await.map_err(|e| {
AssertionError::new("Failed to count elements", format!(">= {n}"), e.to_string())
})?;
let matches = actual >= n;
let expected_match = !self.is_negated;
if matches == expected_match {
return Ok(());
}
if start.elapsed() >= self.timeout {
return Err(AssertionError::new(
if self.is_negated {
format!("Element count should not be at least {n}")
} else {
format!("Element count should be at least {n}")
},
format!(">= {n}"),
actual.to_string(),
));
}
tokio::time::sleep(Duration::from_millis(100)).await;
}
}
/// Assert that the element count is at most a value (less than or equal).
///
/// # Errors
///
/// Returns an error if the assertion fails or the elements cannot be counted.
pub async fn to_have_count_at_most(&self, n: usize) -> Result<(), AssertionError> {
let start = std::time::Instant::now();
loop {
let actual = self.locator.count().await.map_err(|e| {
AssertionError::new("Failed to count elements", format!("<= {n}"), e.to_string())
})?;
let matches = actual <= n;
let expected_match = !self.is_negated;
if matches == expected_match {
return Ok(());
}
if start.elapsed() >= self.timeout {
return Err(AssertionError::new(
if self.is_negated {
format!("Element count should not be at most {n}")
} else {
format!("Element count should be at most {n}")
},
format!("<= {n}"),
actual.to_string(),
));
}
tokio::time::sleep(Duration::from_millis(100)).await;
}
}
}