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// -------------------------------------------------------------------------------------------------
// Copyright (C) 2015-2026 Nautech Systems Pty Ltd. All rights reserved.
// https://nautechsystems.io
//
// Licensed under the GNU Lesser General Public License Version 3.0 (the "License");
// You may not use this file except in compliance with the License.
// You may obtain a copy of the License at https://www.gnu.org/licenses/lgpl-3.0.en.html
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// -------------------------------------------------------------------------------------------------
//! Common test related helper functions.
/// Checks if two floating-point numbers are approximately equal within the
/// margin of floating-point precision.
///
/// - `a`: The first floating-point number.
/// - `b`: The second floating-point number.
///
/// # Returns
///
/// Returns `true` if the absolute difference between `a` and `b` is less than
/// `f64::EPSILON`, indicating that they are approximately equal.
///
/// # Example
///
/// ```
/// use nautilus_indicators::testing::approx_equal;
///
/// let a = 0.1 + 0.2;
/// let b = 0.3;
/// assert!(approx_equal(a, b));
/// ```