77 lines
2.4 KiB
Swift
77 lines
2.4 KiB
Swift
import XCTest
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import FuzzyKit
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class IterableFuzzySetTests: XCTestCase {
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private var near4Support4: [IterableFuzzySet<Int, StrideThrough<Int>>.Element] = [
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.init(element: 0, grade: 0.0),
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.init(element: 1, grade: 0.25),
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.init(element: 2, grade: 0.50),
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.init(element: 3, grade: 0.75),
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.init(element: 4, grade: 1.0),
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.init(element: 5, grade: 0.75),
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.init(element: 6, grade: 0.50),
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.init(element: 7, grade: 0.25),
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.init(element: 8, grade: 0.0),
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.init(element: 9, grade: 0.0),
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.init(element: 10, grade: 0.0),
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]
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func test_initFromIntRangeAndDiscreteFunction() {
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let expected = near4Support4
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let range = stride(from: 0, through: 10, by: 1)
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let sut = IterableFuzzySet(range) {
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expected[$0].grade
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}
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let result = Array(sut)
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XCTAssertEqual(result, expected)
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}
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func test_initFromDoubleRangeAndContinuousFunction() {
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let expected = near4Support4.map {
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IterableFuzzySet<Double, StrideThrough<Double>>.Element(
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element: Double($0.element),
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grade: $0.grade
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)
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}
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let sut = IterableFuzzySet(
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stride(from: 0.0, through: 10.0, by: 1),
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membershipFunction: .triangular(minimum: 0.0, peak: 4.0, maximum: 8.0)
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)
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let result = Array(sut)
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XCTAssertEqual(result, expected)
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}
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func test_alphaCut_allValuesAreBelowAlpha() {
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let alpha = 0.5
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let set = IterableFuzzySet(
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stride(from: 0.0, through: 100.0, by: 0.5),
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membershipFunction: .triangular(minimum: 42.0, peak: 69.0, maximum: 88.88)
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)
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let sut = set.alphaCut(alpha)
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let grades = Array(sut).map { $0.grade }
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let allAreBelowAlpha = grades.allSatisfy { $0 >= alpha }
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XCTAssertTrue(allAreBelowAlpha)
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}
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func test_complementOfTriangular_allValuesAddUpToOne() {
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let set = IterableFuzzySet(
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stride(from: 0.0, through: 100.0, by: 0.5),
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membershipFunction: .triangular(minimum: 42.0, peak: 69.0, maximum: 88.88)
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)
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let sut = set.complement()
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let sums = zip(set, sut).map { $0.0.grade + $0.1.grade }
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sums.forEach { XCTAssertApproximatelyEqual(1.0, $0) }
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}
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}
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