93 lines
2.5 KiB
Dart
93 lines
2.5 KiB
Dart
import 'dart:math' as Math;
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import 'package:d4rt_formulas/formula_evaluator.dart';
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import 'package:d4rt_formulas/formula_models.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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group("Formulas", (){
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test("Solve x^2 formula", () {
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final formula = Formula(
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name: 'Test x^2',
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input: [
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VariableSpec(name: 'x', unit: 'scalar'),
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],
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output: VariableSpec(name: 'y', unit: 'scalar'),
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d4rtCode: 'y = x*x;',
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);
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var solution = formulaSolver(formula, "x", {"y": 25}, maxDelta: 1e-10);
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expect( solution, closeTo(5, 1e-10));
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});
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test("Solve x formula", () {
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final formula = Formula(
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name: 'Test x',
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input: [
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VariableSpec(name: 'x', unit: 'scalar'),
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],
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output: VariableSpec(name: 'y', unit: 'scalar'),
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d4rtCode: 'y = x;',
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);
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var solution = formulaSolver(formula, "x", {"y": 123456789}, maxDelta: 1e-10);
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expect(solution, closeTo(123456789, 1e-10));
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});
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});
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group('Native functions', () {
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test("Solve x^2", () {
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Number f(Number x) => x * x;
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var root = functionSolver(f, hint: 10, step: 1);
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expect(root, closeTo(0, 0.1));
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});
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test("Solve (x-1000)^2", () {
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Number f(Number x) => (x - 1000) * (x - 1000);
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var root = functionSolver(f, hint: 10, step: 1, maxTries: 1000);
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expect(root, closeTo(1000, 0.1));
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});
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test("Solve x^2 + 1", () {
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Number f(Number x) => x * x + 1;
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expect(() => functionSolver(f, hint: 10, step: 1),
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throwsA(isA<NoSolutionException>()));
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});
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test("Solve (x-2)(x-10", () {
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Number f(Number x) => (x - 2) * (x - 10);
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expect(functionSolver(f, hint: 10, step: 1), closeTo(10, 0.1));
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});
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test('Solve sqrt(x) = 2 => x = 4', () {
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Number f(Number x) => Math.sqrt(x) - 2;
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var root = functionSolver(f, hint: 5, step: 1);
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expect(root, closeTo(4, 0.1));
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});
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test('Solve sin(x) = 0 near pi (hint 3)', () {
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Number f(Number x) => Math.sin(x);
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var root = functionSolver(f, hint: 3, step: 1);
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expect(root, closeTo(Math.pi, 0.01));
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});
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test('Solve tan(x) = 1 => x = pi/4', () {
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Number f(Number x) => Math.tan(x) - 1;
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var root = functionSolver(f, hint: 0, step: 1);
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expect(root, closeTo(Math.pi / 4, 0.01));
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});
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test('Solve exp(x) = 2 => x = ln(2)', () {
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Number f(Number x) => Math.exp(x) - 2;
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var root = functionSolver(f, hint: 1, step: 1);
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expect(root, closeTo(Math.log(2), 0.01));
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});
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});
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}
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